Question

我在Rails中有2个模型，每个路径都有一个To字段和一个From字段，两者都引用了Location Id，但我似乎无法正确设置关系。任何帮助，将不胜感激。我正在使用Rails 4.2.6。

class Location < ActiveRecord::Base
    #Fields - id, name, description, latitude, longitude

end

和

class Path < ActiveRecord::Base
    #Fields - id, from, to, distance

    # belongs_to :from_location, class_name: 'Location', foreign_key: 'from'
    # belongs_to :to_location, class_name: 'Location', foreign_key: 'to'

    # belongs_to :from_location, class_name: 'Location'
    # belongs_to :to_location, class_name: 'Location'
end

Answer 1

假设您的'from'和'to'字段是包含location id的整数，您应该能够执行以下操作：

class Path < ActiveRecord::Base
  belongs_to :from_location, class_name: 'Location', foreign_key: 'from'
  belongs_to :to_location, class_name: 'Location', foreign_key: 'to'
end

然后，对于Path记录，您应该能够调用.from_location和.to_location来获取位置。

阅读this以获取更多信息。

Ruby-On-Rails中的两个一对多关系

1 个答案: