动态添加/修改activerecord关联

发布于 2024-11-03 00:58:58 字数 860 浏览 0 评论 0原文

我认为 ActiveRecord 不会出现独特的情况，但我似乎找不到任何有类似问题的人，所以这里是：

我有一个用于用户的 User 类和一个定义了功能的 Roles 类用户。例如，您可以有一个角色为“导师”的用户，一个角色为“学生”的用户，以及一个角色为[“导师”，“学生”]的用户：

class User < ActiveRecord::Base
  has_many :roles
end

class Role < ActiveRecord::Base

end

我想要做什么是根据角色添加activerecord关联。显然，学生可能有很多 :courses，导师可能有他们教授的 :subject，学生和导师都可以有很多 :appointments，但将所有这些关联添加到每个 User 实例似乎并不正确要走的路。

子类化 User 似乎也是错误的 - 我想过做 Tutor <用户和学生<用户，并在每个子类中添加适当的关联，但是如果我们有一个学生是导师怎么办？那我们需要一个StudentTutor类吗？如果增加更多的角色，这条路线就显得危险了。

我考虑过做类似的事情：

class User < ActiveRecord::Base

  protected

  after_initialize do
    if self.has_role?(Role::STUDENT)
      has_many :courses # This does not work
    else
      # etc etc etc
    end
  end
end

但我不知道这是否被认为是错误的，或者我什至不知道如何让它发挥作用。处理这种具有关联的用户/角色设置的最佳方法是什么？

原文

I have what I'd think would not be a unique situation with ActiveRecord, but I can't seem to find anyone with a similar issue, so here goes:

I have a User class for users and a Roles class that defines the capabilities of the user. For ex, you could have a user with a role of 'tutor', a user with a role of 'student', and a user with a role of ['tutor', 'student']:

class User < ActiveRecord::Base
  has_many :roles
end

class Role < ActiveRecord::Base

end

What I'd like to do is add activerecord associations based on roles. Clearly, a student may have many :courses, a tutor may have a :subject they teach, and both a student and tutor could have many :appointments, but it doesn't seem like adding all these associations to every User instance is the right way to go.

Subclassing User also seems wrong - I thought about doing Tutor < User and Student < User, and adding the proper associations in each subclass, but what if we have a student that is a tutor? Then we need a StudentTutor class? If more roles are added, this route seems dangerous.

I've considered doing something like:

class User < ActiveRecord::Base

  protected

  after_initialize do
    if self.has_role?(Role::STUDENT)
      has_many :courses # This does not work
    else
      # etc etc etc
    end
  end
end

But I have no idea if this is considered wrong or how I'd even make it work. What's the best method for dealing with this kind of user/role setup with associations?

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回忆追雨的时光 2024-11-10 00:58:58

我会为您的问题推荐一个宝石。请参阅相关的SO问题：角色宝石的推荐

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謌踐踏愛綪 2024-11-10 00:58:58

我会做以下事情：

class User < ActiveRecord::Base
  has_many :roles
end

class Role < ActiveRecord::Base
end

class Tutor < Role
  has_one :subject
end

class Student < Role
  has_many :courses
end

I would do the following:

class User < ActiveRecord::Base
  has_many :roles
end

class Role < ActiveRecord::Base
end

class Tutor < Role
  has_one :subject
end

class Student < Role
  has_many :courses
end

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