Ruby on rails Rails多属于关联

我有一个如附图所示的模式

现在在回答模块中，我有以下代码

class Answer < ActiveRecord::Base
    belongs_to :project, class_name: "Project", foreign_key: "project_id"
    belongs_to :questionair, class_name: "Questionair", foreign_key: "questionair_id"
end

class-Answer

这些是属于线路的吗？当我删除项目时，答案会按预期删除，但在调查问卷的情况下，它无法删除关联的答案行。 我必须额外做什么。我有：

class Project < ActiveRecord::Base
    has_many :answers, dependent: :destroy
end
class Questionair < ActiveRecord::Base
    has_many :answers, dependent: :destroy
end 

class项目

试试这种方法

class Answer < ActiveRecord::Base
    belongs_to :project
    belongs_to :questionair
end

class Project < ActiveRecord::Base
    has_many :answers, dependent: :destroy
end

class Questionair < ActiveRecord::Base
    has_many :answers, dependent: :destroy
end 

如果你使用

project.delete #this does not trigger dependent destroy

---

我怎么能理解你，你只想在一个命令中销毁所有依赖项：

project.destroy 
# delete all nested answers, 
# questionairies and questionairies->answers

因此，您需要在项目模型中添加一行

class Project < ActiveRecord::Base
  has_many :answers, dependent: :destroy
  has_many :questionairies, dependent: :destroy
end

class项目

而不是

class Project < ActiveRecord::Base
    has_many :answers, dependent: :destroy
end

class项目

---

如果我理解你的错误，请更深入地解释你的问题。

yo man。。我触发了删除，并希望使用。销毁，我搞砸了。删除和。销毁，谢谢。。

class Project < ActiveRecord::Base
    has_many :answers, dependent: :destroy
end