Rails模型has_many：through关系
[英]Rails model has_many :through relationship
问题描述
User , Car , Part , Tire . 
User ， Car ， Part ， Tire 。 User has many Car s. User有很多Car 。 Car has many Part s. Car有很多Part 。 Part has many Tire s. Part有很多Tire 。
In user.rb, I have 在user.rb中，我有
has_many :tires, through: :cars
However, it seems like this is not a correct way of doing it since there is another model Part in the middle. 但是，这似乎不是正确的方法，因为中间还有另一个模型Part 。
How should I successfully do to make has_many relationships between User and Tire ? 如何成功建立User和Tire之间的has_many关系？
1 个解决方案
解决方案1
2 已采纳 2016-07-20 18:42:03
You just need to add the connection in the middle. 您只需要在中间添加连接。
# User.rb
has_many :cars
has_many :parts, through: :cars
has_many :tires, through: :parts
声明:本站的技术帖子网页，遵循CC BY-SA 4.0协议，如果您需要转载，请注明本站网址或者原文地址。任何问题请咨询:yoyou2525@163.com.
相关问题
Rails has_many 通过 HABTM 关系 - Rails has_many through a HABTM relationship
has_many通过与中介模型的关系 - has_many through relationship with an intervening model
Rails通过关系查询has_many - Rails querying a has_many through relationship
在rails中确定has_many关系 - Scoping through a has_many relationship in rails
has_many通过与同一模型的关系 - has_many through relationship to the same Model
ruby on rails has_many通过关系 - ruby on rails has_many through relationship
Rails has_many通过中间模型 - Rails has_many through intermediate model
rails model has_many：通过关联 - rails model has_many :through associations
使用has_many：through进行rails模型分配 - rails model assignment with has_many :through
Rails has_many through - 通过关系查询 - Rails has_many through - query through the relationship
相关标签