Overview

For instructions on upgrading to newer versions, visit mongoid.org.

3.0.0 (branch: master)

New Features

#1989 Criteria count, size and length now behave as Active Record with regards to database access.

Criteria#count will always hit the database to get the count.

Criteria#length and Criteria#size will hit the database once if the criteria has not been loaded, and subsequent calls will return the cached value.

If the criteria has been iterated over or loaded, length and size will never hit the db.
#1976 Eager loading no longer produces queries when the base query returns zero results.
Model.find_by now accepts a block and will yield to the found document if it is not nil.
```
  Band.find_by(name: "Depeche Mode") do |band|
    band.likes = 100
  end
```
#1958/#1798 Documents and belongs_to relations now support touch.
```
  class Band
    include Mongoid::Document
    include Mongoid::Timestamps::Updated
    belongs_to :label, touch: true
  end
```
Update the document's updated_at timestamp to the current time. This will also update any touchable relation's timestamp as well.
```
  Band.first.touch
```
Update a specific time field along with the udpated_at.
```
  Band.first.touch(:founded)
```
This fires no validations or callbacks.

Mongoid now supports MongoDB's $findAndModify command.

  Band.find_and_modify("$inc" => { likes: 1 })

  Band.desc(:name).only(:name).find_and_modify(
    { "$inc" => { likes: 1 }}, new: true
  )

#1906 Mongoid will retrieve documents from the identity map when providing multiple ids to find. (Hans Hasselberg)
#1903 Mongoid raises an error if provided a javascript expression to a where clause on an embedded collection. (Sebastien Azimi)
Aggregations now adhere to both a Mongoid API and their enumerable counterparts where applicable.
```
  Band.min(:likes)
  Band.min do |a, b|
    a.likes <=> b.likes
  end

  Band.max(:likes)
  Band.max do |a, b|
    a.likes <=> b.likes
  end
```
Note that when providing a field name and no block, a single numeric value will be returned, but when providing a block, a document will be returned which has the min/max value. This is since Ruby's Enumerable API dictates when providing a block, the matching element is returned.

When providing a block, all documents will be loaded into memory. When providing a symbol, the execution is handled via map/reduce on the server.

A kitchen sink aggregation method is now provided, to get everything in in a single call for a field.

  Band.aggregates(:likes)
  # =>
  #   {
  #     "count" => 2.0,
  #     "max" => 1000.0,
  #     "min" => 500.0,
  #     "sum" => 1500.0,
  #     "avg" => 750.0
  #   }

A DSL off the criteria API is now provided for map/reduce operations as a convenience.

  Band.where(name: "Tool").map_reduce(map, reduce).out(inline: 1)
  Band.map_reduce(map, reduce).out(replace: "coll-name")
  Band.map_reduce(map, reduce).out(inline: 1).finalize(finalize)

Mongoid now uses Origin for its Criteria API. See the Origin repo and API docs for the documentation.
#1861 Mongoid now raises an AmbiguousRelationship error when it cannot determine the inverse of a relation and there are multiple potential candidates. (Hans Hasselberg)
You can now perform an explain directly from criteria.
```
  Band.where(name: "Depeche Mode").explain
```
#1856 Push on one to many relations can now be chained.
```
  band.albums.push(undertow).push(aenima)
```
#1842 MultiParameterAttributes now supported aliased fields. (Anton Orel)
#1833 If an embedded document is attempted to be saved with no parent defined, Mongoid now will raise a Mongoid::Errors::NoParent exception.

Added an ORM-agnostic way to get the field names

  class Band
    include Mongoid::Document
    field :name, type: String
  end

  Band.attribute_names

#1831 find_or_create_by on relations now takes mass assignment and type options. (Tatsuya Ono)

  class Band
    include Mongoid::Document
    embeds_many :albums
  end

  band.albums.find_or_create_by({ name: "101" }, LP)

#1818 Add capability to choose the key where your embeds_many relation is stores. (Cyril Mougel)

  class User
    include Mongoid::Document
    field :name, type: String
    embeds_many :prefs, class_name: "Preference", store_as: 'my_preferences'
  end

  user.prefs.build(value: "ok")
  user.save
  # document saves in MongoDB as:
  # { "name" => "foo", "my_preferences" => [{ "value" => "ok" }]}

#1806 Model.find_or_create_by and Model.find_or_initialize_by can now take documents as paramters for belongs_to relations.
```
  person = Person.first
  Game.find_or_create_by(person: person)
```

#1774 Relations now have a :restrict option for dependent relations which will raise an error when attempting to delete a parent that still has children on it. (Hans Hasselberg)

  class Band
    include Mongoid::Document
    has_many :albums, dependent: :restrict
  end

  band = Band.first
  band.albums << Albums.first
  band.delete # Raises DeleteRestriction error.

#1764 Add method to check if field differs from the default value.

  class Band
    include Mongoid::Document
    field :name, type: String, default: "New"
  end

  band = Band.first
  band.name_changed_from_default?

#1759 Invalid fields error messages have been updated to show the source and location of the original method. The new message is:

  Problem:
    Defining a field named 'crazy_method' is not allowed.
  Summary:
    Defining this field would override the method 'crazy_method',
    which would cause issues with expectations around the original
    method and cause extremely hard to debug issues.
    The original method was defined in:
      Object: MyModule
      File: /path/to/my/module.rb
      Line: 8
  Resolution:
    Use Mongoid.destructive_fields to see what names are
    not allowed, and don't use these names. These include names
    that also conflict with core Ruby methods on Object, Module,
    Enumerable, or included gems that inject methods into these
    or Mongoid internals.

#1753/#1649 A setter and getter for has_many relations to set it's children is now provided. (Piotr Jakubowski)

  class Album
    include Mongoid::Document
    has_many :engineers
  end

  class Engineer
    include Mongoid::Document
    belongs_to :album
  end

  album = Album.first
  engineer = Engineer.first
  album.engineer_ids = [ engineer.id ]
  album.engineer_ids # Returns the ids of the engineers.

#1741 Mongoid now provides a rake task to force remove indexes for environments where Mongoid manages the index definitions and the removal should be automated. (Hans Hasselberg)
```
  rake db:force_remove_indexes
  rake db:mongoid:force_remove_indexes
```
#1726 Mongoid.load! now accepts an optional second argument for the environment to load. This takes precedence over any environment variable that is set if provided.
```
  Mongoid.load!("/path/to/mongoid.yml", :development)
```

#1724 Mongoid now supports regex fields.

  class Rule
    include Mongoid::Document
    field :pattern, type: Regexp, default: /[^abc]/
  end

#1714/#1706 Added better logging on index creation. (Hans Hasselberg)

When an index is present on a root document model:
```
  Creating indexes on: Model for: name, dob.
```
When an index is defined on an embedded model:
```
  Index ignored on: Address, please define in the root model.
```
When no index is defined, nothing is logged, and if a bad index is defined an error is raised.
#1710 For cases when you don't want Mongoid to auto-protect the id and type attributes, you can set a configuration option to turn this off.
```
  Mongoid.protect_sensitive_fields = false
```

#1685 Belongs to relations now have build_ and create_ methods.

  class Comment
    include Mongoid::Document
    belongs_to :user
  end

  comment = Comment.new
  comment.build_user # Build a new user object
  comment.create_user # Create a new user object

#1684 Raise a Mongoid::Errors::InverseNotFound when attempting to set a child on a relation without the proper inverse_of definitions due to Mongoid not being able to determine it.

  class Lush
    include Mongoid::Document
    embeds_one :whiskey, class_name: "Drink"
  end

  class Drink
    include Mongoid::Document
    embedded_in :alcoholic, class_name: "Lush"
  end

  lush = Lush.new
  lush.whiskey = Drink.new # raises an InverseNotFound error.

#1680 Polymorphic relations now use *_type keys in lookup queries.

  class User
    include Mongoid::Document
    has_many :comments, as: :commentable
  end

  class Comment
    include Mongoid::Document
    belongs_to :commentable, polymorphic: true
  end

  user = User.find(id)
  user.comments # Uses user.id and type "User" in the query.

#1677 Support for parent separable polymorphic relations to the same parent class is now available. This only works if set from the parent side in order to know which relation the children belong to. (Douwe Maan)

  class Face
    include Mongoid::Document
    has_one :left_eye, class_name: "Eye", as: :visible
    has_one :right_eye, class_name: "Eye", as: :visible
  end

  class Eye
    include Mongoid::Document
    belongs_to :visible, polymorphic: true
  end

  face = Face.new
  right_eye = Eye.new
  left_eye = Eye.new
  face.right_eye = right_eye
  face.left_eye = left_eye
  right_eye.visible = face # Will raise an error.

#1650 Objects that respond to to_criteria can now be merged into existing criteria objects.

  class Filter
    def to_criteria
      # return a Criteria object.
    end
  end

  criteria = Person.where(title: "Sir")
  criteria.merge(filter)

#1635 All exceptions now provide more comprehensive errors, including the problem that occured, a detail summary of why it happened, and potential resolutions. Example:

  (Mongoid::Errors::DocumentNotFound)
  Problem:
    Document not found for class Town with
    id(s) [BSON::ObjectId('4f35781b8ad54812e1000001')].
  Summary:
    When calling Town.find with an id or array of ids,
    each parameter must match a document in the database
    or this error will be raised.
  Resolution:
    Search for an id that is in the database or set the
    Mongoid.raise_not_found_error configuration option to
    false, which will cause a nil to be returned instead
    of raising this error.

#1616 Model.find_by added which takes a hash of arugments to search for in the database. If no single document is returned a DocumentNotFound error is raised. (Piotr Jakubowski)
```
  Band.find_by(name: "Depeche Mode")
```

#1606 Mongoid now enables autosave, like Active Record, when adding an accepts_nested_attributes_for to a relation.

  class Band
    include Mongoid::Document
    has_many :albums
    accepts_nested_attributes_for :albums # This enables the autosave.
  end

#1477 Mongoid now automatically protects the id and type attributes from mass assignment. You can override this (not recommended) by redefining them as accessible.
```
  class Band
    include Mongoid::Document
    attr_accessible :id, :_id, :_type
  end
```

#1459 The identity map can be disabled now for specific code execution by passing options to the unit of work.

  Mongoid.unit_of_work(disable: :all) do
    # Disables the identity map on all threads for the block.
  end

  Mongoid.unit_of_work(disable: :current) do
    # Disables the identity map on the current thread for the block.
  end

  Mongoid.unit_of_work do
    # Business as usual.
  end

#1355 Associations now can have safety options provided to them on single document persistence operations.

  band.albums.with(safe: true).push(album)
  band.albums.with(safe: true).create(name: "Smiths")

  album.with(safe: true).create_producer(name: "Flood")

#1348 Eager loading is now supported on many-to-many relations.
#1292 Remove attribute now unsets the attribute when the document is saved instead of setting to nil.
```
  band = Band.find(id)
  band.remove_attribute(:label) # Uses $unset when the document is saved.
```
#1291 Mongoid database sessions are now connected to lazily, and are completely thread safe. If a new thread is created, then a new database session will be created for it.
#1291 Mongoid now supports any number of database connections as defined in the mongoid.yml. For example you could have a local single server db, a multi availablity zone replica set, and a shard cluster all in the same application environment. Mongoid can connect to any session at any point in time.

#1291 Mongoid now allows you to persist to whatever database or collection you like at runtime, on a per-query or persistence operation basis by using with.

  Band.with(collection: "artists").create(name: "Depeche Mode")
  band.with(database: "secondary).save!
  Band.with(collection: "artists").where(name: "Depeche Mode")

#1291 You can now configure on a per-model basis where it's documents are stored with the new and improved store_in macro.
```
  class Band
    include Mongoid::Document
    store_in collection: "artists", database: "secondary", session: "replica"
  end
```
This can be overridden, of course, at runtime via the with method.

#1212 Embedded documents can now be popped off a relation with persistence.

  band.albums.pop # Pop 1 document and persist the removal.
  band.albums.pop(3) # Pop 3 documents and persist the removal.

#1188 Relations now have existence predicates for simplified checking if the relation is blank or not. (Andy Morris)

  class Band
    include Mongoid::Document
    embeds_many :albums
    embeds_one :label
  end

  band = Band.new
  band.albums?
  band.has_albums?
  band.label?
  band.has_label?

#1188 1-1 relations now have an :autobuild option to indicate if the relation should automatically be build with empty attributes upon access where the relation currently does not exist. Works on embeds_one, embedded_in, has_one, belongs_to. (Andy Morris)

  class Band
    include Mongoid::Document
    has_one :label, autobuild: true
  end

  band = Band.new
  band.label # Returns a new label with empty attributes.

When using existence checks, autobuilding will not execute.

  band = Band.new
  band.label? # Returns false, does not autobuild on a check.
  band.has_label? # Returns false, does not autobuild on a check.

#1081 Mongoid indexes both id and type as a compound index when providing index: true to a polymorphic belongs_to.

  class Comment
    include Mongoid::Document

    # Indexes commentable_id and commentable_type as a compound index.
    belongs_to :commentable, polymorphic: true, index: true
  end

#1053 Raise a Mongoid::Errors::UnknownAttribute instead of no method when attempting to set a field that is not defined and allow dynamic fields is false. (Cyril Mougel)

  Mongoid.allow_dynamic_fields = false

  class Person
    include Mongoid::Document
    field :title, type: String
  end

  Person.new.age = 50 # raises the UnknownAttribute error.

#772 Fields can now be flagged as readonly, which will only let their values be set when the document is new.

  class Band
    include Mongoid::Document
    field :name, type: String
    field :genre, type: String

    attr_readonly :name, :genre
  end

Readonly values are ignored when attempting to set them on persisted
documents, with the exception of update_attribute and remove_attribute,
where errors will get raised.

  band = Band.create(name: "Depeche Mode")
  band.update_attribute(:name, "Smiths") # Raises ReadonlyAttribute error.
  band.remove_attribute(:name) # Raises ReadonlyAttribute error.

Major Changes (Backwards Incompatible)

#2039 Validating presence of a relation now checks both the relation and the foreign key value.

Indexing syntax has changed. The first parameter is now a hash of name/direction pairs with an optional second hash parameter for additional options.

Normal indexing with options, directions are either 1 or -1:

  class Band
    include Mongoid::Document
    field :name, type: String

    index({ name: 1 }, { unique: true, background: true })
  end

Geospacial indexing needs "2d" as it's direction.

  class Venue
    include Mongoid::Document
    field :location, type: Array

    index location: "2d"
  end

Custom serializable fields have revamped. Your object no longer should include Mongoid::Fields::Serializable - instead it only needs to implement 3 methods: #mongoize, .demongoize and .evolve.

`#mongoize` is an instance method that transforms your object into
a mongo-friendly value.

`.demongoize` is a class method, that can take some data from mongo
and instantiate and object of your custom type.

`.evolve` is a class method, that can take any object, and
transform it for use in a `Mongoid::Criteria`.

An example of an implementation of this for `Range`:

  class Range

    def mongoize
      { "min" => first, "max" => last }
    end

    class << self

      def demongoize(object)
        Range.new(object["min"], object["max"])
      end

      def evolve(object)
        { "$gte" => object.first, "$lte" => object.last }
      end
    end
  end

Document#changes is no longer a hash with indifferent access.
after_initialize callbacks no longer cascade to children if the option is set.
#1865 count on the memory and mongo contexts now behave exactly the same as Ruby's count on enumerable, and can take an object or a block. This is optimized on the mongo context not to load everything in memory with the exception of passing a block.
```
  Band.where(name: "Tool").count
  Band.where(name: "Tool").count(tool) # redundant.
  Band.where(name: "Tool") do |doc|
    doc.likes > 0
  end
```
Note that although the signatures are the same for both the memory and mongo contexts, it's recommended you only use the block syntax for the memory context since the embedded documents are already loaded into memory.

Also note that passing a boolean to take skip and limit into account is no longer supported, as this is not necessarily a useful feature.
The autocreate_indexes configuration option has been removed.
Model.defaults no longer exists. You may get all defaults with a combination of Model.pre_processed_defaults and Model.post_processed_defaults.
```
  Band.pre_processed_defaults
  Band.post_processed_defaults
```
Model.identity and Model.key have been removed. For custom ids, users must now override the _id field.

When the default value is a proc, the default is applied after all other attributes are set.
```
  class Band
    include Mongoid::Document
    field :_id, type: String, default: ->{ name }
  end
```
To have the default applied before other attributes, set :pre_processed to true.
```
  class Band
    include Mongoid::Document
    field :_id,
      type: String,
      pre_processed: true,
      default: ->{ BSON::ObjectId.new.to_s }
  end
```
Custom application exceptions in various languages has been removed, along with the Mongoid.add_language feature.
Mongoid no longer supports 1.8 syntax. 1.9.x or other vms running in 1.9 mode is now only supported.
#1734 When searching for documents via Model.find with multiple ids, Mongoid will raise an error if not all ids are found, and tell you what the missing ones were. Previously the error only got raised if nothing was returned.
#1675 Adding presence validation on a relation now enables autosave. This is to ensure that when a new parent object is saved with a new child and marked is valid, both are persisted to ensure a correct state in the database.
#1491 Ensure empty translations returns an empty hash on access.
#1484 Model#has_attribute? now behaves the same as Active Record.
#1471 Mongoid no longer strips any level of precision off of times.
#1475 Active support's time zone is now used by default in time serialization if it is defined.
#1342 Model.find and model.relation.find now only take a single or multiple ids. The first/last/all with a conditions hash has been removed.
#1291 The mongoid.yml has been revamped completely, and upgrading existing applications will greet you with some lovely Mongoid specific configuration errors. You can re-generate a new mongoid.yml via the existing rake task, which is commented to an insane degree to help you with all the configuration possibilities.

#1291 The persist_in_safe_mode configuration option has been removed. You must now tell a database session in the mongoid.yml whether or not it should persist in safe mode by default.

  production:
    sessions:
      default:
        database: my_app_prod
        hosts:
          - db.app.com:27018
          - db.app.com:27019
        options:
          consistency: :eventual
          safe: true

#1291 safely and unsafely have been removed. Please now use with to provide safe mode options at runtime.

  Band.with(safe: true).create
  band.with(safe: { w: 3 }).save!
  Band.with(safe: false).create!

#1270 Relation macros have been changed to match their AR counterparts: only :has_one, :has_many, :has_and_belongs_to_many, and :belongs_to exist now.
#1268 Model#new? has been removed, developers must now always use Model#new_record?.
#1182 A reload is no longer required to refresh a relation after setting the value of the foreign key field for it. Note this behaves exactly as Active Record.

If the id is set, but the document for it has not been persisted, accessing the relation will return empty results.

If the id is set and it's document is persisted, accessing the relation will return the document.

If the id is set, but the base document is not saved afterwards, then reloading will return the document to it's original state.
#1093 Field serialization strategies have changed on Array, Hash, Integer and Boolean to be more consistent and match AR where appropriate.

Serialization of arrays calls Array.wrap(object) Serialization of hashes calls Hash[object] (to_hash on the object) Serialization of integers always returns an int via to_i Serialization of booleans defaults to false instead of nil.
#933 :field.size has been renamed to :field.count in criteria for $size not to conflict with Symbol's size method.
#829/#797 Mongoid scoping code has been completely rewritten, and now matches the Active Record API. With this backwards incompatible change, some methods have been removed or renamed.

Criteria#as_conditions and Criteria#fuse no longer exist.

Criteria#merge now only accepts another object that responds to to_criteria.

Criteria#merge! now merges in another object without creating a new criteria object.
```
  Band.where(name: "Tool").merge!(criteria)
```
Named scopes and default scopes no longer take hashes as parameters. From now on only criteria and procs wrapping criteria will be accepted, and an error will be raised if the arguments are incorrect.
```
  class Band
    include Mongoid::Document

    default_scope ->{ where(active: true) }
    scope :inactive, where(active: false)
    scope :invalid, where: { valid: false } # This will raise an error.
  end
```
The 'named_scope' macro has been removed, from now on only use 'scope'.

Model.unscoped now accepts a block which will not allow default scoping to be applied for any calls inside the block.
```
  Band.unscoped do
    Band.scoped.where(name: "Ministry")
  end
```
Model.scoped now takes options that will be set directly on the criteria options hash.
```
  Band.scoped(skip: 10, limit: 20)
```

Resolved Issues

#1997 Cascading callbacks should be able to halt the callback chain when terminating.
#1972 added, loaded, and unloaded can now be valid scope names on a document that is part of a 1-n relation.
#1952/#1950 #all_in behaviour on embedded documents now properly matches root documents when passing an empty array. (Hans Hasselberg)
#1941/#1939 Model.find_by now returns nil if raise not found error is set to false. (Hans Hasselberg)
#1859/#1860 Model#remove_attribute now properly unsets on embedded documents. (Anton Onyshchenko)
#1852 Ensure no infinite recursion on cascading callbacks. (Ara Howard)
#1823 Relation#includes? now properly works with identity map enabled.
#1810 Model#changed? no longer returns true when hash and array fields have only been accessed.
#1876/#1782 Allow dot notation in embeds many criteria queries. (Cyril Mougel)
#1745 Fixed batch clear to work within attribute setting.
#1718 Ensure consistency of #first/#last in relations - they now always match first/last in the database, but opts for in memory first.
#1692/#1376 Model#updateattributes and Model#update_attributes! now accept assignment options. (Hans Hasselberg)
#1688/#1207 Don't require namespacing when providing class name on relation macros inside the namespace. (Hans Hasselberg)
#1665/#1672 Expand complex criteria in nested criteria selectors, like #matches. (Hans Hasselberg)
#1335 Don't add id sorting criteria to first/last is there is already sorting options on the criteria.
#1321 Referenced many enumerable targets are now hash-backed, preventing duplicates in a more efficient manner.
#1135 DateTimes now properly get time zones on deserialization.
#1031 Mongoid now serializes values in Array fields to their proper Mongo-friendly values when possible.
#685 Attempting to use versioning with embedded documents will now raise a proper error alerting the developer this is not allowed.

2.4.11 (branch: 2.4.0-stable)

Resolved Issues

#2038 Allow inverse relations to be determined by foreign keys alone if defined on both sides, not just an inverse_of declaration.
#2023 Allow serilialization of dynamic types that conflict with core Ruby methods to still be serialized.
#2008 Presence validation should hit the db to check validity if the relation in memory is blank.

2.4.10

Resolved Issues

#2003 Don't fail on document generation when an embedded document was stored as nil in the database.
#1997 Don't delete paranoid embedded docs via nested attributes when a before_destroy callback returns false.
#1994 dependent: :delete only hits the database once now for one to many and many to many relations instead of once for each document.
#1987 Don't double-insert documents into identity map when eager loading twice inside the unit of work.
#1953 Uniqueness validation now works on localized fields.
#1936 Allow setting n levels deep embedded documents atomically without conflicting mods when not using nested attributes or documents themselves in an update call from the parent.
#1957/#1954 Ensure database name is set with inheritance. (Hans Hasselberg)

2.4.9

Resolved Issues

#1943 Ensure numericality validation works for big decimals.
#1938 Length validation now works with localized fields.
#1936 Conflicting pushes with other pushes is now properly handled.
#1933 Proxy#extend should delegate through to the target, where extending the proxy itself is now handled through Proxy#proxy_extend.
#1930 Ensure complex criteria are expanded in all where clauses. (Hans Hasselberg)
#1928 Deletion of embedded documents via nested attributes now performs a $pull with id match criteria instead of a $pullAll to cover all cases. Previously newly added defaults to documents that had already persisted could not be deleted in this matter since the doc did not match what was in the database.
#1924/#1917 Fix pushing to embedded relations with default scopes not scoping on the new document. (Hans Hasselberg)
#1922/#1919 Dropping collections unmemoizes the internally wrapped collection, in order to ensure when defining capped collections that they are always recreated as capped. (Hans Hasselberg)
#1916/#1913 Uniqueness validation no longer is affected by the default scope. (Hans Hasselberg)
#1943 Ensure numericality validation works for big decimals.

2.4.8

Resolved Issues

#1892 When getting not master operation error, Mongoid should reconnect before retrying the operation.
#1887 Don't cascade callbacks to children that don't have the callback defined.
#1882 Don't expand duplicate id criterion into an $and with duplicate selections.
#1878 Fixed default application values not to apply in certain only or without selection on iteration, not just first and last.
#1874 Fixed the reject all blank proc constant to handle values properly with a destroy non blank value. (Stefan Daschek)
#1869/#1868 Delayed atomic sets now uses the atomic path instead of the metadata name to fix multiple level embedding issues. (Chris Micacchi provided specs)
#1866 Post processed defaults (procs) should be applied post binding of the child in a relation.build.

2.4.7

Resolved Issues

Ensure reloading of embedded documents retains reference to the parent.
#1837 Always pass symbol options to the driver.
#1836 Ensure relation counts pick up persisted document that have not had the foreign key link persisted.
#1820 Destroying embedded documents in an embeds_many should also removed the document from the underlying _uncoped target and reindex the relation.
#1814 Don't cascade callbacks on after_initialize.
#1800 Invalid options for the Mongo connection are now filtered out.
#1785 Case equality has been fixed to handle instance checks properly.

2.4.6

Resolved Issues

#1772 Allow skip and limit to convert strings to integers. (Jean Boussier)
#1767 Model#update_attributes accepts mass assignment options again. (Hans Hasselberg)
#1762 Criteria#any_of now properly handles localized fields.
#1758 Metadata now returns self on options for external library support.
#1757 Ensure serialization converts any attribute types to the type defined by the field.
#1756 Serializable hash options should pass through to embedded docs.

2.4.5

Resolved Issues

#1751 Mongoid's logger now responds to level for Ruby logging API compatibility.
#1744/#1750 Sorting works now for localized fields in embedded documents using the criteria API. (Hans Hasselberg)
#1746 Presence validation now shows which locales were empty for localized fields. (Cyril Mougel)
#1727 Allow dot notation in embedded criteria to work on both embeds one and embeds many. (Lyle Underwood)
#1723 Initialize callbacks should cascade through children without needing to determine if the child is changed.
#1715 Serializable hashes are now consistent on inclusion of embedded documents per or post save.
#1713 Fixing === checks when comparing a class with an instance of a subclass.
#1495 Callbacks no longer get the 'super called outside of method` errors on busted 1.8.7 rubies.

2.4.4

Resolved Issues

#1705 Allow changing the order of many to many foreign keys.
#1703 Updated at is now versioned again. (Lucas Souza)
#1686 Set the base metadata on unbind as well as bind for belongs to relations.
#1681 Attempt to create indexes for models without namespacing if the namespace does not exist for the subdirectory.
#1676 Allow eager loading to work as a default scope.
#1665/#1672 Expand complex criteria in nested criteria selectors, like #matches. (Hans Hasselberg)
#1668 Ensure Mongoid logger exists before calling warn. (Rémy Coutable)
#1661 Ensure uniqueness validation works on cloned documents.
#1659 Clear delayed atomic sets when resetting the same embedded relation.
#1656/#1657 Don't hit database for uniqueness validation if BOTH scope and attribute hasn't changed. (priyaaank)
#1205/#1642 When limiting fields returned from the database via Criteria#only and Criteria#without and then subsequently saving the document. Default values no longer override excluded fields.

2.4.3

Resolved Issues

#1647 DateTime serialization when already in UTC does not convert to local time.
#1641/#1639 Mongoid.observer.disable :all now behaves as AR does.
#1640 Update consumers should be tied to the name of the collection they persist to, not the name of the class.
#1637/#1636 Scopes no longer modify parent class scopes when subclassing. (Hans Hasselberg)
#1629 $all and $in criteria on embedded many relations now properly handles regex searches and elements of varying length. (Douwe Maan)
#1623/#1634 Default scopes no longer break Mongoid::Versioning. (Hans Hasselberg)
#1605 Fix regression of rescue responses, Rails 3.2

2.4.2

Resolved Issues

#1628 _type field can once again be included in serialization to json or xml as a global option with include_type_for_serialization. (Roman Shterenzon)
#1627 Validating format now works properly with localized fields. (Douwe Maan)
#1617 Relation proxy methods now show up in Mongoid's list of prohibited fields.
#1615 Allow a single configuration of host and port for all spec runs, overridden by setting MONGOID_SPEC_HOST and MONGOID_SPEC_PORT env vars.
#1610 When versioning paranoid documents and max version is set, hard delete old versions from the embedded relation.
#1609 Allow connection retry during cursor iteration as well as all other operations.
#1608 Guard against no method errors when passing ids in nested attributes and the documents do not exist.
#1605 Remove deprecation warning on rescue responses, Rails 3.2
#1602 Preserve structure of $and and $or queries when typecasting.
#1600 Uniqueness validation no longer errors when provided a relation.
#1599 Make sure enumerable targets yield to what is in memory first when performing #each, not always the unloaded first.
#1597 Fix the ability to change the order of array fields with the same elements.
#1590 Allow proper serialization of boolean values in criteria where the field is nested inside an array.

2.4.1

Resolved Issues

#1593 Arrays on embedded documents now properly atomically update when modified from original version.
#1592 Don't swallow exceptions from index generation in the create_indexes rake task.
#1589 Allow assignment of empty array to HABTM when no documents are yet loaded into memory.
#1587 When a previous value for an array field was an explicit nil, it can now be reset atomically with new values.
#1585 Model#respond_to? returns true now for the setter when allowing dynamic fields.
#1582 Allow nil values to be set in arrays.
#1580 Allow arrays to be set to nil post save, and not just empty.
#1579 Don't call #to_a on individual set field elements in criterion.
#1576 Don't hit database on uniqueness validation if the field getting validated has not changed.
#1571 Aliased fields get all the dirty attribute methods and all getters and setters for both the original name and the alias. (Hans Hasselberg)
#1568 Fallback to development environment with warning when no env configured.
#1565 For fields and foreign keys with non-standard Ruby or database names, use define_method instead of class_eval for creating the accessors and dirty methods.
#1557 Internal strategy class no longer conflicts with models.
#1551 Parent documents now return true for Model#changed? if only child (embedded) documents have changed.
#1547 Resetting persisted children from a parent save when new waits until post callbacks, mirroring update functionality.
#1536 Eager loading now happens when calling first or last on a criteria if inclusions are specified.

2.4.0

New Features

Ranges can now be passed to #where criteria to create a $gte/$lte query under the covers. Person.where(dob: start_date...end_date)
Custom serializable fields can now override #selection to provide customized serialization for criteria queries.
#1544 Internals use Array.wrap instead of to_a now where possible.
#1511 Presence validation now supports localized fields. (Tiago Rafael Godinho)
#1506 Model.set will now accept false and nil values. (Marten Veldthuis)
#1505 Model.delete_all/destroy_all now take either a :conditions hash or the attributes directly.
#1504 Model.recursively_embeds_many now accepts a :cascade_callbacks option. (Pavel Pravosud)
#1496 Mongoid now casts strings back to symbols for symbol fields that get saved as strings by another application.
#1454, #900 Associations now have an after_build callback that gets executed after .build or build_ methods are called. (Jeffrey Jones, Ryan Townsend)
#1451 Ranges can now be any range value, not just numbers. (aupajo)
#1448 Localization is now used when sorting. (Hans Hasselberg)
#1422 Mongoid raises an error at yaml load if no environment is found. (Tom Stuart)
#1413 $not support added to criteria symbol methods. (Marc Weil)
#1403 Added configuration option scope_overwrite_exception which defaults to false for raising an error when defining a named scope with the same name of an existing method. (Christoph Grabo)
#1388 model.add_to_set now supports adding multiple values and performs an $addToSet with $each under the covers. (Christian Felder)
#1387 Added Model#cache_key for use in Rails caching. (Seivan Heidari)
#1380 Calling Model.find(id) will now properly convert to and from any type based on the type of the _id field.
#1363 Added fallbacks and default support to localized fields, and added ability to get and set all translations at once.
#1362 Aliased fields now properly typecast in criteria.
#1337 Array fields, including HABTM many foreign keys now have smarter dirty checking and no longer perform a simple $set if the array has changed. If items have only been added to the array, it performs a $pushAll. If items have only been removed, it performs a $pullAll. If both additions and removals have occurred it performs a $set to avoid conflicting mods.

Resolved Issues

Calling Document#as_document on a frozen document on Rubinius returns the attributes instead of nil.
#1554 Split application of default values into proc/non-procs, where non-procs get executed immediately during instantiation, and procs get executed after all other values are set.
#1553 Combinations of adding and removing values from an array use a $set on the current contents of the array, not the new values.
#1546 Dirty changes should be returned in a hash with indifferent access.
#1542 Eager loading now respects the options (ie skip, limit) provided to the criteria when fetch the associations.
#1530 Don't duplicate added values to arrays via dirty tracking if the array is a foreign key field.
#1529 Calling unscoped on relational associations now works properly.
#1524 Allow access to relations in overridden field setters by pre-setting foreign key default values.
#1523 Allow disabling of observers via disable. (Jonas Schneider)
#1522 Fixed create indexes rake task for Rails 3.2. (Gray Manley)
#1517 Fix Mongoid documents to properly work with RSpec's stub_model. (Tiago Rafael Godinho)
#1516 Don't duplicate relational many documents on bind.
#1515 Mongoid no longer attempts to serialize custom fields on complex criteria by default.
#1503 Has many relation substitution now handles any kind of mix of existing and new docs.
#1502 Nested attributes on embedded documents respects if the child is paranoid.
#1497 Use provided message on failing uniqueness validation. (Justin Etheredge)
#1491 Return nil when no default set on localized fields. (Tiago Rafael Godinho)
#1483 Sending module includes at runtime which add new fields to a parent document, also have the fields added to subclasses.
#1482 Applying new sorting options does not merge into previously chained criteria. (Gerad Suyderhoud)
#1481 Fix invalid query when accessing many-to-many relations before defaults are set.
#1480 Mongoid's internal serialized field types renamespaced to Internal in order to not conflict with ruby core classes in custom serializable types.
#1479 Don't duplicate ids on many-to-many when using create or create!
#1469 When extract_id returns nil, get the document out of the identity map by the criteria selector.
#1467 Defining a field named metadata now properly raises an invalid field error.
#1463 Batch insert consumers are now scoped to collection to avoid persistence of documents to other collections in callbacks going to the wrong place.
#1462 Assigning has many relations via nested attribtues *_attributes= does not autosave the relation.
#1461 Fixed serialization of foreign key fields in complex criteria not to escape the entire hash.
#1458 Versioning no longer skips fields that have been protected from mass assignment.
#1455, #1456 Calling destroy on any document now temporarily marks it as flagged for destroy until the operation is complete. (Nader Akhnoukh)
#1453 Model#to_key should return a value when the document is destroyed.
#1449 New documents no longer get persisted when replaced on a has one as a side effect. (jasonsydes)
#1439 embedded? should return true when relation defined as cyclic.
#1433 Polymorphic nested attributes for embedded and relational 1-1 now update properly.
#1426 Frozen documents can now be cloned. (aagrawal2001)
#1382 Raise proper error when creating indexes via rake task if index definition is incorrect. (Mathieu Ravaux)
#1381, #1371 The identity map now functions properly with inherited documents. (Paul Canavese)
#1370 Split concat on embedded arrays into its own method to handle the batch processing due to after callback run execution issues.
#1366 Array and hash values now get deep copied for dirty tracking.
#1359 Provide ability to not have default scope applied to all named scopes via using lambdas.
#1333 Fixed errors with custom types that exist in namespaces. (Peter Gumeson)
#1259 Default values are treated as dirty if they differ from the database state.
#1255 Ensure embedded documents respect the defined default scope.

2.3.4

#1445 Prevent duplicate documents in the loaded array on the target enumerable for relational associations.
#1442 When using create_ methods for has one relations, the appropriate destructive methods now get called when replacing an existing document.
#1431 Enumerable context should add to the loaded array post yield, so that methods like #any? that short circuit based on the value of the block dont falsely have extra documents.
#1418 Documents being loaded from the database for revision purposes no longer get placed in the identity map.
#1399 Allow conversion of strings to integers in foreign keys where the id is defined as an int.
#1397 Don't add default sorting criteria on first if they sort criteria already exists.
#1394 Fix exists? to work when count is greater than 1. (Nick Hoffman)
#1392 Return 0 on aggregation functions where field is nonexistant.
#1391 Uniqueness validation now works properly on embedded documents that are using primary key definitions.
#1390 When _type field is lower case class camelize before constantizing.
#1383 Fix cast on read for serializable fields that are subclassed.
#1357 Delayed atomic sets from update_attributes on embedded documents multiple levels deep now properly persist.
#1326 Ensure base document on HABTM gets its keys saved after saving a newly build child document.
#1301 Don't overwrite base metadata on embedded in relations if already set.
#1221 HABTM with inverse nil is allowed again on embedded documents.
#1208 Don't auto-persist child documents via the setter when setting from an embedded_in.
#791 Root document updates its timestamps when only embedded documents have changed.

2.3.3

Resolved Issues

#1386 Lowered mongo/bson dependency to 1.3
#1377 Fix aggregation functions to properly handle nil or indefined values. (Maxime Garcia)
#1373 Warn if a scope overrides another scope.
#1372 Never persist when binding inside of a read attribute for validation.
#1364 Fixed reloading of documents with non bson object id ids.
#1360 Fixed performance of Mongoid's observer instantiation by hooking into Active Support's load hooks, a la AR.
#1358 Fixed type error on many to many synchronization when inverse_of is set to nil.
#1356 $in criteria can now be chained to non-complex criteria on the same key without error.
#1350, #1351 Fixed errors in the string conversions of double quotes and tilde when paramterizing keys.
#1349 Mongoid documents should not blow up when including Enumerable. (Jonas Nicklas)

2.3.2

Resolved Issues

#1347 Fix embedded matchers when provided a hash value that does not have a modifier as a key.
#1346 Dup default sorting criteria when calling first/last on a criteria.
#1343 When passing no arguments to Criteria#all_of return all documents. (Chris Leishman)
#1339 Ensure destroy callbacks are run on cascadable children when deleting via nested attributes.
#1324 Setting inverse_of: nil on a many-to-many referencing the same class returns nil for the inverse foreign key.
#1323 Allow both strings and symbols as ids in the attributes array for nested attributes. (Michael Wood)
#1312 Setting a logger on the config now accepts anything that quacks like a logger.
#1297 Don't hit the database when accessing relations if the base is new.
#1239 Allow appending of referenced relations in create blocks, post default set.
#1236 Ensure all models are loaded in rake tasks, so even in threadsafe mode all indexes can be created.
#736 Calling #reload on embedded documents now works properly.

2.3.1

Resolved Issues

#1338 Calling #find on a scope or relation checks that the document in the identity map actually matches other scope parameters.
#1321 HABTM no longer allows duplicate entries or keys, instead of the previous inconsistencies.
#1320 Fixed errors in perf benchmark.
#1316 Added a separate Rake task "db:mongoid:drop" so Mongoid and AR can coexist. (Daniel Vartanov)
#1311 Fix issue with custom field serialization inheriting from hash.
#1310 The referenced many enumerable target no longer duplicates loaded and added documents when the identity map is enabled.
#1295 Fixed having multiple includes only execute the eager loading of the first.
#1287 Fixed max versions limitation with versioning.
#1277 attribute_will_change! properly flags the attribute even if no change occured.
#1063 Paranoid documents properly run destroy callbacks on soft destroy.
#1061 Raise Mongoid::Errors::InvalidTime when time serialization fails.
#1002 Check for legal bson ids when attempting conversion.
#920 Allow relations to be named target.
#905 Return normalized class name in metadata if string was defined with a prefixed ::.
#861 accepts_nested_attributes_for is no longer needed to set embedded documents via a hash or array of hashes directly.
#857 Fixed cascading of dependent relations when base document is paranoid.
#768 Fixed class_attribute definitions module wide.
#408 Embedded documents can now be soft deleted via Mongoid::Paranoia.

2.3.0

New Features

Mongoid now supports basic localized fields, storing them under the covers as a hash of locale => value pairs. field :name, localize: true
#1275 For applications that default safe mode to true, you can now tell a single operation to persist without safe mode via #unsafely: person.unsafely.save, Person.unsafely.create. (Matt Sanders)
#1256 Mongoid now can create indexes for models in Rails engines. (Caio Filipini)
#1228 Allow pre formatting of compsoite keys by passing a block to #key. (Ben Hundley)
#1222 Scoped mass assignment is now supported. (Andrew Shaydurov)
#1196 Timestamps can now be turned off on a call-by-call basis via the use of #timeless: person.timeless.save, Person.timeless.create(:title => "Sir").
#1103 Allow developers to create their own custom complex criteria. (Ryan Ong)
Mongoid now includes all defined fields in serializable_hash and to_json results even if the fields have no values to make serialized documents easier to use by ActiveResource clients.
Support for MongoDB's $and operator is now available in the form of: Criteria#all_of(*args) where args is multiple hash expressions.
#1250, #1058 Embedded documents now can have their callbacks fired on a parent save by setting :cascade_callbacks => true on the relation. (pyromanic, Paul Rosania, Jak Charlton)

Major Changes

Mongoid now depends on Active Model 3.1 and higher.
Mongoid now depends on the Mongo Ruby Driver 1.4 and higher.
Mongoid requires MongoDB 2.0.0 and higher.

Resolved Issues

#1308 Fixed scoping of HABTM finds.
#1300 Namespaced models should handle recursive embedding properly.
#1299 Self referenced documents with versioning no longer fail when inverse_of is not defined on all relations.
#1296 Renamed internal building method to _building.
#1288, #1289 _id and updated_at should not be part of versioned attributes.
#1273 Mongoid.preload_models now checks if preload configuration option is set, where Mongoid.load_models always loads everything. (Ryan McGeary)
#1244 Has one relations now adhere to default dependant behaviour.
#1225 Fixed delayed persistence of embedded documents via $set.
#1166 Don't load config in Railtie if no env variables defined. (Terence Lee)
#1052 alias_attribute now works again as expected.
#939 Apply default attributes when upcasting via #becomes. (Christos Pappas)
#932 Fixed casting of integer fields with leading zeros.
#948 Reset version number on clone if versions existed.
#763 Don't merge $in criteria arrays when chaining named scopes.
#730 Existing models that have relations added post persistence of originals can now have new relations added with no migrations.
#726 Embedded documents with compound keys not validate uniqueness correctly.
#582 Cyclic non embedded relations now validate uniqueness correctly.
#484 Validates uniqueness with multiple scopes of all types now work properly.
Deleting versions created with Mongoid::Versioning no longer fires off dependent cascading on relations.

2.2.5

This was a small patch release to address 2.2.x Heroku errors during asset compilation.

2.2.4

#1377 Fix aggregation functions to properly handle nil or indefined values. (Maxime Garcia)
#1373 Warn if a scope overrides another scope.
#1372 Never persist when binding inside of a read attribute for validation.
#1358 Fixed type error on many to many synchronization when inverse_of is set to nil.
#1356 $in criteria can now be chained to non-complex criteria on the same key without error.
#1350, #1351 Fixed errors in the string conversions of double quotes and tilde when paramterizing keys.
#1349 Mongoid documents should not blow up when including Enumerable. (Jonas Nicklas)

2.2.3

#1295 Fixed having multiple includes only execute the eager loading of the first.
#1225 Fixed delayed persistence of embedded documents via $set.
#1002 Fix BSON object id conversion to check if legal first.

2.2.2

This release removes the restriction of a dependency on 1.3.x of the mongo ruby driver. Users may now use 1.3.x through 1.4.x.

2.2.1

Resolved Issues

#1210, #517 Allow embedded document relation queries to use dot notation. (Scott Ellard)
#1198 Enumerable target should use criteria count if loaded has no docs.
#1164 Get rid of remaining no method in_memory errors.
#1070 Allow custom field serializers to have their own constructors.
#1176 Allow access to parent documents from embedded docs in after_destroy callbacks.
#1191 Context group methods (min, max, sum) no longer return NaN but instead return nil if field doesn't exist or have values.
#1193, #1271 Always return Integers for integer fields with .000 precisions, not floats.
#1199 Fixed performance issues of hash and array field access when reading multiple times.
#1218 Fixed issues with relations referencing models with integer foreign keys.
#1219 Fixed various conflicting modifications issues when pushing and pulling from the same embedded document in a single call.
#1220 Metadata should not get overwritten by nil on binding.
#1231 Renamed Mongoid's atomic set class to Sets to avoid conflicts with Ruby's native Set after document inclusion.
#1232 Fix access to related models during before_destroy callbacks when cascading.
#1234 Fixed HABTM foreign key synchronization issues when destroying documents.
#1243 Polymorphic relations dont convert to object ids when querying if the ids are defined as strings.
#1247 Force Model.first to sort by ascending id to guarantee first document.
#1248 Added #unscoped to embedded many relations.
#1249 Destroy flags in nested attributes now actually destroy the document for has_many instead of just breaking the relation.
#1272 Don't modify configuration options in place when creating replica set connections.

2.2.0

New Features

Mongoid now contains eager loading in the form of Criteria#includes(*args). This works on has_one, has_many, belongs_to associations and requires the identity map to be enabled in order to function. Set identity_map_enabled: true in your mongoid.yml. Ex: Person.where(title: "Sir").includes(:posts, :game)
Relations can now take a module as a value to the :extend option. (Roman Shterenzon)
Capped collections can be created by passing the options to the #store_in macro: Person.store_in :people, capped: true, max: 1000000
Mongoid::Collection now supports collection.find_and_modify
Document#has_attribute? now aliases to Document#attribute_present?
#930 You can now turn off the Mongoid logger via the mongoid.yml by doing logger: false
#909 We now raise a Mongoid::Errors::Callback exception if persisting with a bang method and a callback returns false, instead of the uninformative validations error from before.

Major Changes

#1173 has_many relations no longer delete all documents on a set of the relation (= [ doc_one, doc_two ]) but look to the dependent option to determine what behaviour should occur. :delete and :destroy will behave as before, :nullify and no option specified will both nullify the old documents without deleting.
#1142, #767 Embedded relations no longer immediately persist atomically when accessed via a parent attributes set. This includes nested attributes setting and attributes= or write_attributes. The child changes then remain dirty and atomically update when save is called on them or the parent document.

Resolved Issues

#1190 Fixed the gemspec errors due to changing README and CHANGELOG to markdown.
#1180, #1084, #955 Mongoid now checks the field types rather than if the name contains /id/ when trying to convert to object ids on criteria.
#1176 Enumerable targets should always return the in memory documents first, when calling #first
#1175 Make sure both sides of many to many relations are in sync during a create.
#1172 Referenced enumerable relations now properly handle #to_json (Daniel Doubrovkine)
#1040 Increased performance of class load times by removing all delegate calls to self.class.

2.1.9

Resolved Issues

#1159 Fixed build blocks not to cancel out each other when nested.
#1154 Don't delete many-to-many documents on empty array set.
#1153 Retain parent document reference in after callbacks.
#1151 Fix associated validation infinite loop on self referencing documents.
#1150 Validates associated on belongs_to is false by default.
#1149 Fixed metadata setting on belongs_to relations.
#1145 Metadata inverse should return nil if inverse_of was set as nil.
#1139 Enumerable targets now quack like arrays.
#1136 Setting belongs_to parent to nil no longer deletes the parent.
#1120 Don't call in_memory on relations if they don't respond to it.
#1075 Set self in default procs to the document instance.
#1072 Writing attributes for nested documents can take a hash or array of hashes.
#990 Embedded documents can use a single embedded_in with multiple parent definitions.

2.1.8

Resolved Issues

#1148 Fixed respond_to? on all relations to return properly.
#1146 Added back the Mongoid destructive fields check when defining fields.
#1141 Fixed conversions of nil values in criteria.
#1131 Verified Mongoid/Kaminari paginating correctly.
#1105 Fixed atomic update consumer to be scoped to class.
#1075 self in default lambdas and procs now references the document instance.
#740 Removed embedded_object_id configuration parameter.
#661 Fixed metadata caching on embedded documents.
#595 Fixed relation reload flagging.
#410 Moving documents from one relation to another now works as expected.

2.1.7

This was a specific release to fix MRI 1.8.7 breakages introduced by 2.1.6.

2.1.6

Resolved Issues

#1126 Fix setting of relations with other relation proxies.
#1122 Hash and array fields now properly flag as dirty on access and change.
#656 Fixed reload breaking relations on unsetting of already loaded associations.
#647 Prefer #unset to #remove_attribute for removing values.
#290 Verify pushes into deeply embedded documents.

2.1.5

Resolved Issues

#1116 Embedded children retain reference to parent in destroy callbacks.
#1110, #1115 Don't memoize metadata related helpers on documents.
#1112 db:create_indexes no longer indexes subclasses multiple times.
#1111, #1098 Don't set _id in $set operations.
#1007 Update attribute properly tracks array changes.

2.1.4

This was a specific release to get a Psych generated gemspec so no more parse errors would occur on those rubies that were using the new YAML parser.

2.1.3

Resolved Issues

#1109 Fixed validations not loading one to ones into memory.
#1107 Mongoid no longer wants required mongoid/railtie in application.rb.
#1102 Fixed nested attributes deletion.
#1097 Reload now runs after_initialize callbacks.
#1079 Embeds many no longer duplicates documents.
#1078 Fixed array criteria matching on embedded documents.
#1028 Implement scoped on one-to-many and many-to-many relations.
#988 Many-to-many clear no longer deletes the child documents.
#977 Autosaving relations works also through nested attributes.
#972 Recursive embedding now handles namespacing on generated names.
#943 Don't override Document#attributes.
#893 Verify count is not caching on many to many relations.
#815 Verify after_initialize is run in the correct place.
#793 Verify any_of scopes chain properly with any other scope.
#776 Fixed mongoid case quality when dealing with subclasses.
#747 Fixed complex criteria using its keys to render its string value.
#721 #safely now properly raises validation errors when they occur.

2.1.2

Resolved Issues

#1082 Alias size and length to count on criteria. (Adam Greene)
#1044 When multiple relations are defined for the same class, always return the default inverse first if inverse_of is not defined.
#710 Nested attributes accept both id and _id in hashes or arrays.
#1047 Ignore nil values passed to embeds_man pushes and substitution. (Derick Bailey)

2.1.1

Resolved Issues

#1021, #719 Many to many relations dont trigger extra database queries when pushing new documents.
#607 Calling create on large associations does not load the entire relation.
#1064 Mongoid::Paranoia should respect unscoped and scoped.
#1026 model#update_attribute now can update booleans to false.
#618 Crack XML library breaks Mongoid by adding #attributes method to the String class. (Stephen McGinty)

2.1.0

Major Changes

Mongoid now requires MongoDB 1.8.x in order to properly support the #bit and #rename atomic operations.
Traditional slave support has been removed from Mongoid. Replica sets should be used in place of traditional master and slave setups.
Custom field serialization has changed. Please see serializable for changes.
The dirty attribute tracking has been switched to use ActiveModel, this brings many bug fixes and changes:
- #756 After callbacks and observers see what was changed instead of changes just made being in previous_changes
- #434 Documents now are flagged as dirty when brand new or the state on instantiation differs from the database state. This is consistent with ActiveRecord.
- #323 Mongoid now supports [field]_will_change! from ActiveModel::Dirty
Mongoid model preloading in development mode now defaults to false.
:autosave => true on relational associations now saves on update as well as create.
Mongoid now has an identity map for simple find_by_id queries. See the website for documentation.

New Features

#1067 Fields now accept a :versioned attribute to be able to disable what fields are versioned with Mongoid::Versioning. (Jim Benton)
#587 Added order preference to many and many to many associations. (Gregory Man)
Added ability to chain order_by statements. (Gregory Man)
#961 Allow arbitrary Mongo::Connection options to pass through Mongoid::Config::Database object. (Morgan Nelson)
Enable autosave for many to many references. (Dave Krupinski)
The following explicit atomic operations have been added: Model#bit, Model#pop, Model#pull, Model#push_all, Model#rename, Model#unset.
Added exception translations for Hindi. (Sukeerthi Adiga)

Resolved Issues

#974 Fix attribute_present? to work correctly then attribute value is false, thanks to @nickhoffman. (Gregory Man)
#960 create indexes rake task is not recognizing a lot of mongoid models because it has problems guessing their model names from filenames. (Tobias Schlottke)
#874 Deleting from a M-M reference is one-sided. (nickhoffman, davekrupinski)
Replace deprecated class_inheritable_hash dropped in Rails 3.1+. (Konstantin Shabanov)
Fix inconsistent state when replacing an entire many to many relation.
Don't clobber inheritable attributes when adding subclass field inheritance. (Dave Krupinski)
#914 Querying embedded documents with $or selector. (Max Golovnia)
#514 Fix marshaling of documents with relation extensions. (Chris Griego)
Metadata#extension now returns a Module, instead of a Proc, when an extension is defined.
#837 When allow_dynamic_fields is set to false and loading an embedded document with an unrecognized field, an exception is raised.
#963 Initializing array of embedded documents via hash regressed (Chris Griego, Morgan Nelson)
Mongoid::Config.reset resets the options to their default values.
Mongoid::Fields.defaults is memoized for faster instantiation of models.

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CHANGELOG.md

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CHANGELOG.md

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Overview

3.0.0 (branch: master)

New Features

Major Changes (Backwards Incompatible)

Resolved Issues

2.4.11 (branch: 2.4.0-stable)

Resolved Issues

2.4.10

Resolved Issues

2.4.9

Resolved Issues

2.4.8

Resolved Issues

2.4.7

Resolved Issues

2.4.6

Resolved Issues

2.4.5

Resolved Issues

2.4.4

Resolved Issues

2.4.3

Resolved Issues

2.4.2

Resolved Issues

2.4.1

Resolved Issues

2.4.0

New Features

Resolved Issues

2.3.4

2.3.3

Resolved Issues

2.3.2

Resolved Issues

2.3.1

Resolved Issues

2.3.0

New Features

Major Changes

Resolved Issues

2.2.5

2.2.4

2.2.3

2.2.2

2.2.1

Resolved Issues

2.2.0

New Features

Major Changes

Resolved Issues

2.1.9

Resolved Issues

2.1.8

Resolved Issues

2.1.7

2.1.6

Resolved Issues

2.1.5

Resolved Issues

2.1.4

2.1.3

Resolved Issues

2.1.2

Resolved Issues

2.1.1

Resolved Issues

2.1.0

Major Changes

New Features

Resolved Issues