I can see the only difference is that in my case there's namespace in front 
of the table names and FK. But in yours there's none since it's a normal 
app.
But is this the cause ?

On Wednesday, April 29, 2015 at 6:53:18 PM UTC+3, Chris Lerum wrote:
>
> https://github.com/chrislerum/factory
> I tried whipping up an app with your code, the controller test passes fine 
> for me, see if it works for you and compare.
>
> On Wednesday, April 29, 2015 at 10:32:47 AM UTC-4, Rafael Adel wrote:
>>
>> I'm trying to create a `photo` factory that's in a many to one 
>> association with `gallery`. And I'm getting two errors, depending on how I 
>> specify the association between those two models.
>>
>> Here's the models:
>>
>> *Photo*
>>
>> belongs_to :gallery, class_name: "SevenGallery::Gallery"
>>
>> *Gallery*
>>  
>> has_many :photos, class_name: "SevenGallery::Photo", foreign_key: 
>> "seven_gallery_gallery_id", dependent: :destroy
>>
>>
>>
>> And the migrations
>>
>>     
>> create_table :seven_gallery_galleries do |t|
>>      t.string :title  
>>        t.timestamps null: false
>>     end
>>     
>>     create_table :seven_gallery_photos do |t|
>>        t.string :caption
>>        t.string :image
>>        t.references :seven_gallery_gallery, index: true
>>        t.timestamps null: false
>>      end
>>
>>
>>      add_foreign_key :seven_gallery_photos, :seven_gallery_galleries, 
>> on_delete: :cascade
>>
>>
>>
>> Now Here's my factories:
>> **Gallery**: 
>>
>>     
>> FactoryGirl.define do
>>       factory :gallery, class: 'SevenGallery::Gallery' do
>>         title "an event gallery"
>>         factory :gallery_with_photos do 
>>        after(:build) do |gallery| 
>>         gallery.photos << FactoryGirl.create(:photo_one, 
>> seven_gallery_gallery_id: gallery)
>>         gallery.photos << FactoryGirl.create(:photo_two, 
>> seven_gallery_gallery_id: gallery)
>>         gallery.photos << FactoryGirl.create(:photo_three, 
>> seven_gallery_gallery_id: gallery)
>>        end
>>         end
>>       end
>>     end
>>
>>
>> And **Photo**:
>>
>>     
>> FactoryGirl.define do
>>       factory :photo, class: "SevenGallery::Photo" do
>>          
>>      factory :photo_one do
>>      end
>>     
>>      factory :photo_two do
>>      end
>>     
>>      factory :photo_three do
>>      end
>>     
>>      factory :photo_with_gallery do
>>       gallery 
>>      end
>>       end
>>     end
>>
>>
>>
>> And here's the controller spec that generates the error:
>>
>>    
>>  it "changes is_main to true in self and false in rest" do
>>      photo_one = FactoryGirl.create(:photo_with_gallery)
>>      expect(photo_one.gallery).to be_a SevenGallery::Gallery
>>  end
>>
>>
>> Whenever I run the test I get this error:
>>
>>     
>> Failure/Error: photo_one = FactoryGirl.create(:photo_with_gallery)
>>       ActiveModel::MissingAttributeError:
>>         can't write unknown attribute `gallery_id`
>>       # ./spec/controllers/seven_gallery/photos_controller_spec.rb:
>>
>> When I change  the association part to be:
>>
>>     
>> factory :photo_with_gallery do
>>       association :gallery, factory: gallery 
>>     end
>>
>> I get this error:
>>
>>    
>>  Failure/Error: photo_one = FactoryGirl.create(:photo_with_gallery)
>>       NoMethodError:
>>          undefined method `name' for :photo_with_gallery:Symbol 
>>        # ./spec/controllers/seven_gallery/photos_controller_spec.rb:8
>>
>>
>> **Backtrace**:
>>
>>    
>>  # 
>> /home/rafael/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activerecord-4.2.1/lib/active_record/attribute.rb:138:in
>>  
>> `with_value_from_database'
>>          # 
>> /home/rafael/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activerecord-4.2.1/lib/active_record/attribute_set.rb:39:in
>>  
>> `write_from_user'
>>          # 
>> /home/rafael/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activerecord-4.2.1/lib/active_record/attribute_methods/write.rb:74:in
>>  
>> `write_attribute_with_type_cast'
>>          # 
>> /home/rafael/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activerecord-4.2.1/lib/active_record/attribute_methods/write.rb:56:in
>>  
>> `write_attribute'
>>          # 
>> /home/rafael/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activerecord-4.2.1/lib/active_record/attribute_methods/dirty.rb:96:in
>>  
>> `write_attribute'
>>          # 
>> /home/rafael/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activerecord-4.2.1/lib/active_record/attribute_methods.rb:373:in
>>  
>> `[]='
>>          # 
>> /home/rafael/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activerecord-4.2.1/lib/active_record/associations/belongs_to_association.rb:83:in
>>  
>> `replace_keys'
>>          # 
>> /home/rafael/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activerecord-4.2.1/lib/active_record/associations/belongs_to_association.rb:14:in
>>  
>> `replace'
>>          # 
>> /home/rafael/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activerecord-4.2.1/lib/active_record/associations/singular_association.rb:17:in
>>  
>> `writer'
>>          # 
>> /home/rafael/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activerecord-4.2.1/lib/active_record/associations/builder/association.rb:123:in
>>  
>> `gallery='
>>          # 
>> /home/rafael/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/factory_girl-4.5.0/lib/factory_girl/attribute_assigner.rb:16:in
>>  
>> `public_send'
>>          # 
>> /home/rafael/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/factory_girl-4.5.0/lib/factory_girl/attribute_assigner.rb:16:in
>>  
>> `block (2 levels) in object'
>>          # 
>> /home/rafael/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/factory_girl-4.5.0/lib/factory_girl/attribute_assigner.rb:15:in
>>  
>> `each'
>>          # 
>> /home/rafael/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/factory_girl-4.5.0/lib/factory_girl/attribute_assigner.rb:15:in
>>  
>> `block in object'
>>          # 
>> /home/rafael/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/factory_girl-4.5.0/lib/factory_girl/attribute_assigner.rb:14:in
>>  
>> `tap'
>>          # 
>> /home/rafael/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/factory_girl-4.5.0/lib/factory_girl/attribute_assigner.rb:14:in
>>  
>> `object'
>>          # 
>> /home/rafael/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/factory_girl-4.5.0/lib/factory_girl/evaluation.rb:12:in
>>  
>> `object'
>>          # 
>> /home/rafael/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/factory_girl-4.5.0/lib/factory_girl/strategy/create.rb:9:in
>>  
>> `result'
>>          # 
>> /home/rafael/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/factory_girl-4.5.0/lib/factory_girl/factory.rb:42:in
>>  
>> `run'
>>          # 
>> /home/rafael/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/factory_girl-4.5.0/lib/factory_girl/factory_runner.rb:23:in
>>  
>> `block in run'
>>          # 
>> /home/rafael/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/activesupport-4.2.1/lib/active_support/notifications.rb:166:in
>>  
>> `instrument'
>>          # 
>> /home/rafael/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/factory_girl-4.5.0/lib/factory_girl/factory_runner.rb:22:in
>>  
>> `run'
>>          # 
>> /home/rafael/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/factory_girl-4.5.0/lib/factory_girl/strategy_syntax_method_registrar.rb:20:in
>>  
>> `block in define_singular_strategy_method'
>>          # 
>> ./spec/controllers/seven_gallery/photos_controller_spec.rb:8:in `block (3 
>> levels) in <module:SevenGallery>'
>>          # 
>> /home/rafael/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/rspec-core-3.2.3/lib/rspec/core/example.rb:177:in
>>  
>> `instance_exec'
>>          # 
>> /home/rafael/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/rspec-core-3.2.3/lib/rspec/core/example.rb:177:in
>>  
>> `block in run'
>>          # 
>> /home/rafael/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/rspec-core-3.2.3/lib/rspec/core/example.rb:385:in
>>  
>> `block in with_around_and_singleton_context_hooks'
>>          # 
>> /home/rafael/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/rspec-core-3.2.3/lib/rspec/core/example.rb:343:in
>>  
>> `block in with_around_example_hooks'
>>          # 
>> /home/rafael/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/rspec-core-3.2.3/lib/rspec/core/hooks.rb:474:in
>>  
>> `block in run'
>>          # 
>> /home/rafael/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/rspec-core-3.2.3/lib/rspec/core/hooks.rb:614:in
>>  
>> `block in run_around_example_hooks_for'
>>          # 
>> /home/rafael/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/rspec-core-3.2.3/lib/rspec/core/example.rb:247:in
>>  
>> `call'
>>          # 
>> /home/rafael/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/rspec-core-3.2.3/lib/rspec/core/example.rb:247:in
>>  
>> `call'
>>          # 
>> /home/rafael/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/rspec-rails-3.2.1/lib/rspec/rails/example/controller_example_group.rb:179:in
>>  
>> `block (2 levels) in <module:ControllerExampleGroup>'
>>          # 
>> /home/rafael/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/rspec-core-3.2.3/lib/rspec/core/example.rb:333:in
>>  
>> `instance_exec'
>>          # 
>> /home/rafael/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/rspec-core-3.2.3/lib/rspec/core/example.rb:333:in
>>  
>> `instance_exec'
>>          # 
>> /home/rafael/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/rspec-core-3.2.3/lib/rspec/core/hooks.rb:387:in
>>  
>> `execute_with'
>>          # 
>> /home/rafael/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/rspec-core-3.2.3/lib/rspec/core/hooks.rb:616:in
>>  
>> `block (2 levels) in run_around_example_hooks_for'
>>          # 
>> /home/rafael/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/rspec-core-3.2.3/lib/rspec/core/example.rb:247:in
>>  
>> `call'
>>          # 
>> /home/rafael/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/rspec-core-3.2.3/lib/rspec/core/example.rb:247:in
>>  
>> `call'
>>          # 
>> /home/rafael/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/rspec-rails-3.2.1/lib/rspec/rails/adapters.rb:113:in
>>  
>> `block (2 levels) in <module:MinitestLifecycleAdapter>'
>>          # 
>> /home/rafael/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/rspec-core-3.2.3/lib/rspec/core/example.rb:333:in
>>  
>> `instance_exec'
>>          # 
>> /home/rafael/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/rspec-core-3.2.3/lib/rspec/core/example.rb:333:in
>>  
>> `instance_exec'
>>          # 
>> /home/rafael/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/rspec-core-3.2.3/lib/rspec/core/hooks.rb:387:in
>>  
>> `execute_with'
>>          # 
>> /home/rafael/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/rspec-core-3.2.3/lib/rspec/core/hooks.rb:616:in
>>  
>> `block (2 levels) in run_around_example_hooks_for'
>>          # 
>> /home/rafael/.rbenv/versions/2.2.0/lib/ruby/gems/2.2.0/gems/rspec-core-3.2.3/lib/rspec/core/example.rb:247:in
>>  
>> `call'
>>          # /home/rafael/
>> ...
>
>

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