Question

我的模型结构是：

class Location < ActiveRecord::Base
  has_many :traders
  has_many :service_locations
  has_many :services, through: :service_locations
end

class Service < ActiveRecord::Base
    has_many :service_locations
    has_many :locations, through: :service_locations
end

class ServiceLocation < ActiveRecord::Base
    belongs_to :location
    belongs_to :service
end

执行

时出现以下错误

s=Service.find(1)
l=Location.find(1)

s.service_locations << l

ActiveRecord::AssociationTypeMismatch: ServiceLocation(#84843750) expected, got Location(#93937750)

当变量反转并且我在这里找不到问题时，也会发生这种情况，还有什么想法？

Answer 1

正确的代码将是以下之一：

l=Location.find(1)    
s.locations << l

或

l=ServiceLocation.find(1)    
s.service_locations << l

这是自我解释，我希望你得到错误。另请查看documentation，它将帮助您了解ActiveRecord关联。

ActiveRecord :: AssociationTypeMismatch - 多对多关联

1 个答案: