Question

我正试图从一个模型到另一个模型获得两个has_many关系。具体来说，我想：

class Driver < Active:Record::Base
  has_many :reservations
  has_many :requested_reservations

和

class Reservations < Active:Record::Base
  belongs_to :driver
  belongs_to :requester

第一个是在预订模型上使用driver_id的正常has_many / belongs_to关系。

但是对于第二个，我希望能够调用@driver.requested_reservations和@reservation.requester，并让它使用Reservations类中的requester_id列。我需要在那些has_many和belongs_to行的末尾放置什么才能让它正常工作？

Answer 1

我相信你可以设置类和外键来获得所需的结果。

class Driver < Active:Record::Base
  has_many :reservations
  has_many :requested_reservations, class_name: 'Reservation', foreign_key: 'your_id'
  ...
end

class Reservations < Active:Record::Base
  belongs_to :driver
  belongs_to :requester, class_name: 'Driver', foreign_key: 'requester_id'
  ...
end

Answer 2

之前有过类似的问题。有关更多信息，请参阅以下链接：

Rails multiple associations between two models

how to specify multiple relationships between models in rails using ActiveRecord associations

Rails与其他模型有着双重关系

2 个答案: