1 個模型上的 rails 多態關聯

Question

rails 是否提供多個多態關聯。 並允許 has_many 關系。

class Picture < ActiveRecord::Base
  belongs_to :image, polymorphic: true
  belongs_to :icon, polymorphic: true 
end

class Event < ActiveRecord::Base
  has_many :pictures, as: :image
  has_many :pictures, as: :icon
end

謝謝

Answer 1

Rails 的活動記錄確實允許您定義多態關聯。

從文檔：

class Picture < ApplicationRecord
  belongs_to :imageable, polymorphic: true
end

class Employee < ApplicationRecord
  has_many :pictures, as: :imageable
end

class Product < ApplicationRecord
  has_many :pictures, as: :imageable
end