Add workaround for attributes with _id

docs/src/cookbook/attributes-with-id-suffix.md

@@ -0,0 +1,50 @@
+# Attributes with _id suffix
+
+When using FactoryBot in a rails application, defining factory attributes ending with `_id` may cause an unexpected behaviour:
+
+```ruby
+# Migration:
+  create_table :realtors, force: true do |t|
+    t.boolean :duplicate, default: false, null: false
+    t.string :duplicate_id
+  end
+
+# Factory
+FactoryBot.define do
+  factory :realtor do
+    duplicate { false }
+    duplicate_id { "This should exist" }
+  end
+end
+```
+
+```
+realtor1 = create(:realtor, id: 6, duplicate: true, duplicate_id: 'dup1')
+[1] pry> realtor1.duplicate_id
+=> nil
+```
+
+A fix for this would be to make sure the special behavior related to `_id` is exclusive to `factory_bot_rails`, since `factory_bot` is framework-agnostic.
+
+A workaround can be to use trasients to declare those attributes instead of a regular attribute declaration
+
+```
+    transient do
+      duplicate { false }
+      duplicate_id { "This should exist" }
+    end
+
+    initialize_with do
+      new(attributes.merge(duplicate:, duplicate_id:))
+    end
+```
+
+You can also override the list of aliases to include the attributes you want to exclude:
+
+```
+FactoryBot.aliases = [
+  [/([^(?:duplicate)].+)_id/, '\1'],
+  [/([^(?:duplicate)].*)/, '\1_id']
+]
+```
+