用连接表导轨多个模块

Question

我有一个连接表; ThingLocation的事件和地点，想要添加另一个mudule：简介

thing_location.rb

class ThingLocation < ActiveRecord::Base 
belongs_to :event 
belongs_to :location 
end 

event.rb

class Event < ApplicationRecord 
has_many :thing_locations 
has_many :locations, through: :thing_locations 
end 

location.rb

class Location < ApplicationRecord 
has_many :thing_locations 
has_many :events, through: :thing_locations 
end 

所有做工精细直到我想添加第三个模块：配置文件通过连接表ThingL使用可用的位置ocation。

当我尝试在配置文件更新抢位置的形式，它抛出错误“事件必须存在”

删除：从thing_locations.rb“belongs_to的事件”解决，但是这将删除之间的关联型材和事件

....添加新的模型之后：配置文件

thing_location.rb

class ThingLocation < ActiveRecord::Base 
belongs_to :event 
belongs_to :location 
belongs_to :profile 

end 

event.rb

class Event < ApplicationRecord 

has_many :thing_locations 
has_many :locations, through: :thing_locations 

belongs_to:profile 
end 

location.rb

class Location < ApplicationRecord 
has_many :thing_locations 
has_many :events, through: :thing_locations 
has_many :profiles, through: :thing_locations 
end 

profile.rb

class Profile < ApplicationRecord 
has_many :thing_locations 
has_many :locations, through: :thing_locations 

has_many :hows, dependent: :destroy 

end 

Answer 1

就在导轨5中，加入 “可选：真” 的连接模块修复了问题：

thing_location.rb

class ThingLocation < ActiveRecord::Base 
belongs_to :event, optional: true 
belongs_to :location 
belongs_to :profile, optional: true 

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