factory_girl-关联，rails中的多态

Question

我具有以下rails模型关系，对于这些关系，工厂女孩的工厂定义没有正确并给出错误。

class MediaFile < ActiveRecord::Base
  belongs_to :admin
end

class MediaFileMapping < ActiveRecord::Base
  belongs_to :media_file
  belongs_to :admin
  belongs_to :mediable, :polymorphic => true
end

class Image < MediaFile
  has_attached_file :media
  # and other things
end

class ImageMapping < MediaFileMapping
end

class Fruit < ActiveRecord::Base      
  belongs_to :product
  has_many :image_mappings, :as => :mediable
  has_many :images, :class_name => "Image", :through => :image_mappings, :source => :media_file

# and other things here
end

class Product < ActiveRecord::Base      
  has_many :fruits, :dependent => :destroy
# other things here    
end

我为此而努力写工厂。 这是最后一次给出错误的尝试

尝试的工厂定义如下

FactoryGirl.define do     
        factory :product do
            fruit
        end

        factory :fruit do
            association :image_mapping, factory: :media_file_mapping
            association :image
        end

        factory :image, class: Image, parent: :media_file do
        end

        factory :image_mapping, class: ImageMapping, parent: :media_file_mapping do
        end

        factory :admin do
        end

        factory :media_file do
            association :admin
        end

    factory :media_file_mapping do
        media_file
        admin
    end

end

通过工厂创建新产品时，出现以下错误

undefined method `image_mapping=' for #<Fruit:0xbcb8bfc> (NoMethodError)

修正工厂定义的任何指导都将有所帮助。

Answer 1

水果工厂不正确。

语法：association：image_mapping，factory：：media_file_mapping可以用于belongs_to关联。

当您处理has_many关联（这种情况）时，您需要在工厂定义中手动添加关联的记录。 一个例子：

    factory :fruit do
        after(:create) do |fruit|
            fruit.image_mappings << FactoryGirl.create(:image_mapping)
            fruit.images << FactoryGirl.create(:image)
        end
        fruit.save
    end

您可能还应该移动水果工厂，使其位于image_mapping和image工厂下面。 这样，将在调用水果工厂时定义这些工厂。