Question

我一直在努力解决一个问题，我正在更新一个具有两层嵌套字段的模型。

我有一个非常简单的模型

class Flight < Plan
  attr_accessible :travels_attributes
  has_many :travels, :class_name => "FlightTravel", :foreign_key => "plan_id", :dependent => :destroy
  accepts_nested_attributes_for :travels, :allow_destroy => true
End

class FlightTravel < ActiveRecord::Base
  attr_accessible :segments_attributes

  has_many :segments, :class_name => "FlightSegment", :dependent => :destroy, :foreign_key => "flight_travel_id"
  accepts_nested_attributes_for :segments, :allow_destroy => true
end

class FlightSegment < ActiveRecord::Base

end

现在，当我尝试在控制台中调用flight.update_attributes（：travels_attributes =＆gt; {...}）时，会使用正确的值正确更新对象。

我调用flight.save并且它没有做任何事情，并且由于某种原因只是跳过更新嵌套关联。我做错了什么？

Answer 1

好的，我发现了我遇到的问题。

我的课程实际上是这样的

class Flight < Plan
  attr_accessible :travels_attributes
  has_many :travels, :class_name => "FlightTravel", :foreign_key => "plan_id", :dependent => :destroy
  accepts_nested_attributes_for :travels, :allow_destroy => true
End

class Travel < ActiveRecord::Base
  attr_accessible :segments_attributes
   has_many :segments, :class_name => "TravelSegment", :dependent => :destroy, :foreign_key => "flight_travel_id"
  accepts_nested_attributes_for :segments, :allow_destroy => true
end

class FlightTravel < Travel
  attr_accessible :segments_attributes

  has_many :segments, :class_name => "FlightSegment", :dependent => :destroy, :foreign_key => "flight_travel_id"
  accepts_nested_attributes_for :segments, :allow_destroy => true
end

class FlightSegment < ActiveRecord::Base

end

我原以为FlightTravel细分会覆盖Travel细分，但由于某种原因，它没有。它适用于创建记录，但不适用于您想要更新的内容。

更新对象时不保存嵌套属性

1 个答案: