有很多关于名称空间模型的介绍

Question

我有以下几点

class Service < ActiveRecord::Base
  has_many :service_testimonials, class_name: 'Service::Testimonial', dependent: :destroy
  has_many :testimonials, through: :service_testimonials
end

class Service::Testimonial < ActiveRecord::Base
  belongs_to :service
  belongs_to :testimonial
end

class Testimonial < ActiveRecord::Base

  has_many :service_testimonials, class_name: 'Service::Testimonial', dependent: :destroy
  has_many :services, through: :service_testimonials
end

但是如果我做了Service.first.testimonials，则sql是SELECT "service_testimonials".* FROM "service_testimonials" INNER JOIN "service_testimonials" "service_testimonials_testimonials_join" ON "service_testimonials"."id" = "service_testimonials_testimonials_join"."testimonial_id" WHERE "service_testimonials_testimonials_join"."service_id" = $1 [["service_id", 1]]。

因此，它返回一个Service::Testimonial的集合，而不是Testimonial，将class_name添加到整个过程并不会有帮助。我能让这个起作用吗？还是我只需要重命名我的模型？

Answer 1

您需要在Service::Testimonial类中进行更改：

class Service::Testimonial < ActiveRecord::Base
  belongs_to :service, class_name: '::Service'
  belongs_to :testimonial, class_name: '::Testimonial'
end

这些class_name是必需的，因为Rails 假设在同一个名称空间中寻找一个类。例如，声明belongs_to :service将被解释为belongs_to :service, class_name: 'Service::Service'，这显然不是您的意图。