Question

我正在一个有会员的网站上工作。每个成员都有订阅。对于订阅，会员需要选择有3个的计划。

这是进行关联的正确方法吗

class Member < ActiveRecord::Base
    has_one :plan, :through => :subscription
end

class Subscription < ActiveRecord::Base
    belongs_to :member
    has_many :plans
end

class Plan < ActiveRecord::Base
    belongs_to :subscription
end

然后可能是这样的

member.plan

将是会员订阅的计划。

Answer 1

如果某个成员一次可以属于一个计划，您可以按如下方式重做模型：

class Member < ActiveRecord::Base
  has_one :subscription
  has_one :plan, :through => :subscription
end

class Subscription < ActiveRecord::Base
  belongs_to :member
  belongs_to :plan
end

class Plan < ActiveRecord::Base
  belongs_to :subscription
  has_many   :members    
end

其他解决方案是通过向Subscription表添加plan_id列来完全避免members模型。

# has a column called plan_id
class Member < ActiveRecord::Base
  has_one :plan
end

class Plan < ActiveRecord::Base
  has_many   :members    
end

has_one：通过关联Rails 3

1 个答案: