has_one ：通过多态 - 这可能吗？
我的应用程序中有模型：
class Comment < ActiveRecord::Base
belongs_to :commentable, :polymorphic => true
端
类 Project < ActiveRecord::Base
has_many :discussions, :dependent => :destroy
has_many :tickets, :dependent => :destroy
端
类讨论 < ActiveRecord::Base
has_many :comments, :as => :commentable, :dependent => :destroy
端
类 Ticket < ActiveRecord::Base
has_many :comments, :as => :commentable, :dependent => :destroy
end
一切正常，但有时通过commentable从comment中获取项目不太方便，即comment.commentable.project。 有没有办法在Comment模型中制作has_one项目？
I have models in my app:
class Comment < ActiveRecord::Base
belongs_to :commentable, :polymorphic => true
end
class Project < ActiveRecord::Base
has_many :discussions, :dependent => :destroy
has_many :tickets, :dependent => :destroy
end
class Discussion < ActiveRecord::Base
has_many :comments, :as => :commentable, :dependent => :destroy
end
class Ticket < ActiveRecord::Base
has_many :comments, :as => :commentable, :dependent => :destroy
end
Everything works fine, but sometimes it's not very convinient to get project from comment through commentable, i.e. comment.commentable.project.
Is there any way to make has_one project in Comment model?
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我会将以下方法添加到您的类
Comment中：这将为您提供相同的结果，而无需使用
ActivRecord的所有魔力。I would add the following method to your class
Comment:This will give you the same result without all the magic of
ActivRecord.