Ruby-on-rails 带有别名的 Rails has_many
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Rails has_many with alias name
提问by doctororange
In my User model I could have:
在我的 User 模型中，我可以：
has_many :tasks
and in my Task model:
在我的任务模型中：
belongs_to :user
Then, supposing the foreign key 'user_id' was stored in the tasks table, I could use:
然后，假设外键“user_id”存储在任务表中，我可以使用：
@user.tasks
My question is, how do I declare the has_many relationship such that I can refer to a User's Tasks as:
我的问题是，如何声明 has_many 关系，以便我可以将用户的任务称为：
@user.jobs
... or ...
... 或者 ...
@user.foobars
Thanks a heap.
谢谢一堆。
回答by Sam Saffron
Give this a shot:
试一试：
has_many :jobs, foreign_key: "user_id", class_name: "Task"
Note, that :asis used for polymorphic associations.
请注意，这:as用于多态关联。
回答by Pwnrar
You could also use alias_attributeif you still want to be able to refer to them as tasks as well:
alias_attribute如果您仍然希望能够将它们称为任务，您也可以使用：
class User < ActiveRecord::Base
alias_attribute :jobs, :tasks
has_many :tasks
end
回答by Ghis
To complete @SamSaffron's answer :
要完成@SamSaffron 的回答：
You can use class_namewith either foreign_keyor inverse_of. I personally prefer the more abstract declarative, but it's really just a matter of taste :
您可以class_name与foreign_key或一起使用inverse_of。我个人更喜欢更抽象的声明，但这真的只是一个品味问题：
class BlogPost
has_many :images, class_name: "BlogPostImage", inverse_of: :blog_post
end
and you need to make sure you have the belongs_toattribute on the child model:
并且您需要确保belongs_to在子模型上具有该属性：
class BlogPostImage
belongs_to :blog_post
end
回答by Brent Kirby
You could do this two different ways. One is by using "as"
你可以用两种不同的方式来做到这一点。一种是使用“作为”
has_many :tasks, :as => :jobs
or
或者
def jobs
self.tasks
end
Obviously the first one would be the best way to handle it.
显然，第一个将是处理它的最佳方法。
