如何设置典型的用户HABTM角色关系

问题描述

我很新的，我正在使用cancan + devise为我的用户auth。然而，我并不确定建立典型用户HABTM角色关系的意义，也不知道HABTM关系是什么。

任何人都可以解释或者指向一个好的教程或例子？

解决方案

HABTM意味着拥有并属于许多。您基本上需要一张桌子作为中间人来跟踪多个id（称为直通表）。当被引用为典型用户HABTM角色关系时，他们确实意味着将有一个用户模型，角色模型，用户表，角色表和一个roles_users表。不要忘了添加HABTM - roles_users - 表。一个典型的设置如下：

  class User< ActiveRecord :: Base 
 has_and_belongs_to_many：roles 
 end 
 
 class Role< ActiveRecord :: Base 
 has_and_belongs_to_many：users 
 end 
  

然后可以使用协会正常说 User.first.roles 和 Role.first.users 。

还有一个 。

I'm quite new to this and I'm using cancan + devise for my user auth. However I'm not really sure what it means to set up a typical users HABTM roles relationship nor do I really understand what a HABTM relationship is.

Can anyone explain it really well or point me to a good tutorial or example?

解决方案

HABTM means has and belongs to many. You basically need a table as a middle man to track multiple id's (called a through table). When referenced as a typical users HABTM roles relationship, they really mean there would be a User model, Role model, users table, roles table, and a roles_users table. Don't forget to add the the HABTM -- roles_users -- table. A typical setup follows:

class User < ActiveRecord::Base
  has_and_belongs_to_many :roles
end

class Role < ActiveRecord::Base
  has_and_belongs_to_many :users
end

You can then use the associations like normal saying User.first.roles and Role.first.users.

There are also a couple Railscasts on your issues.

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