GraphQL::KaminariConnection

Kaminari based GraphQL pagination

Installation

Add this line to your application's Gemfile:

gem 'graphql-kaminari_connection', require: 'graphql/kaminari_connection'

And then execute:

$ bundle

Or install it yourself as:

$ gem install graphql-kaminari_connection

Usage

Include GraphQL::KaminariConnection to an object class:

class Types::Article < GraphQL::Schema::Object
  include GraphQL::KaminariConnection

  field :title, String, null: false
  field :body, String, null: false
end

then set .kaminari_connection to field type and resolve it as a kaminari object:

class Types::Query < GraphQL::Schema::Object
  field :articles, ArticleType.kaminari_connection

  def articles(page: nil, per: nil)
    Article.all.page(page).per(per)
  end
end

class Schema < GraphQL::Schema
  query Types::Query
end

now, the Schema's definition is:

type Article {
  body: String!
  title: String!
}

type ArticlePage {
  items: [Article!]!
  pageData: PageData!
}

type PageData {
  currentPage: Int!
  isFirstPage: Boolean!
  isLastPage: Boolean!
  isOutOfRange: Boolean!
  limitValue: Int!
  nextPage: Int
  prevPage: Int
  totalPages: Int!
}

type Query {
  articles(page: Int, per: Int): ArticlePage!
}

Additional arguments

You can define additional field arguments in its block:

class Types::Query < GraphQL::Schema::Object
  field(:articles, ArticleType.kaminari_connection) do
    argument :scope, Types::ArticleScope, required: true
  end

  def articles(page: nil, per: nil, scope:)
    Article.public_send(scope).page(page).per(per)
  end
end

Without COUNT

Give { without_count: true } to .kaminari_connection:

class Types::Query < GraphQL::Schema::Object
  field :articles, ArticleType.kaminari_connection(without_count: true)

  def articles(page: nil, per: nil)
    Article.all.page(page).per(per).without_count
  end
end

now schema definition contains:

type ArticlePageWithoutTotalPages {
  items: [Article!]!
  pageData: PageDataWithoutTotalPages!
}

type PageDataWithoutTotalPages {
  currentPage: Int!
  isFirstPage: Boolean!
  isLastPage: Boolean!
  isOutOfRange: Boolean!
  limitValue: Int!
  nextPage: Int
  prevPage: Int
  # not have totalPages
}

Development

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/increments/graphql-kaminari_connection. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.

License

The gem is available as open source under the terms of the MIT License.

Code of Conduct

Everyone interacting in the Graphql::KaminariConnection project’s codebases, issue trackers, chat rooms and mailing lists is expected to follow the code of conduct.