ruby-on-rails - 设置一个 :has_many :through association on a belongs_to association Ruby on Rails

Question

我有三个模型，每个模型都有以下关联:

class Model1 < ActiveRecord::Base
  has_many :model2s
  has_many :model3s
end

class Model2 < ActiveRecord::Base
  belongs_to :model1
  has_many :model3s, :through => :model1  # will this work? is there any way around this?
end

class Model3 < ActiveRecord::Base
  belongs_to :model1
  has_many :model2s, :through => :model1  # will this work? is there any way around this?
end

正如您在评论文本中看到的那样，我已经提到了我需要的内容。

Answer 1

您只需创建访问它的方法

class Model2 < ActiveRecord::Base
  belongs_to :model1

  def model3s
    model1.model3s
  end
end

或者，您可以将 model3s 方法委托(delegate)给 model1

class Model2 < ActiveRecord::Base
  belongs_to :model1

  delegate :model3s, :to => :model1

end