Rails 4-STI has_many:通过多态关联

Question

我在尝试通过将Rails 4、STI、多态关联与has_many：组合时遇到问题

问题：UserConnection没有根据STI 保存正确的userable_type

class UserConnection < ActiveRecord::Base
  belongs_to :userable, polymorphic: true
  belongs_to :user
end
class User < ActiveRecord::Base
  has_many :user_connections
  has_many :tagged_posts, through: :user_connections, class_name: 'Post', source: :userable, source_type: 'Post'
end
class Publication < ActiveRecord::Base
  has_many :user_connections, as: :userable, dependent: :destroy
  has_many :users, through: :user_connections
end
class Post < Publication
end
Post.create(user_ids: [1, 2], body: 'yo')
UserConnection.last
=> #<UserConnection id: 1, user_id: 2, userable_id: 44, userable_type: "Publication">

userable_type应该是"Post"，但它是"Publication"。

我尝试根据所有类似的StackOverflow问题添加以下内容：

class UserConnection < ActiveRecord::Base
  belongs_to :userable, polymorphic: true
  belongs_to :user
  def userable_type=(class_name)
     super(class_name.to_s.classify.constantize.base_class.to_s)
  end
end

这没用。

任何想法都将非常感谢

Answer 1

发现这是一个尚未解决的老问题

https://github.com/rails/rails/issues/724

https://github.com/rails/rails/issues/6786

gem补丁解决方案：https://github.com/appfolio/store_base_sti_class

用你的代码测试了它，它就工作了。