Cancan未定义方法“用户”问题 [英] Cancan Undefined Method 'user' Problems

问题描述

我遇到了在我的cancan控制器中定义用户权限的问题：

I'm running into problems defining user permissions in my cancan controller:

class Ability
  include CanCan::Ability

  def initialize(user)
    user ||= User.new # guest user

    if user.role? :admin
      can :manage, :all
    else
    can :read, :all
    can :update, User do |user|  
      user.try(:user) == user  
    end
    end
  end
end

这会导致NoMethodError：

This results in a NoMethodError:

undefined method `user' for #<User:0x000001050914c8>

当我尝试编辑/更新用户时。

When I try and edit / update a user. Everything else seems just fine.

任何帮助表示赞赏

Bob

推荐答案

问题是

user.try(:user) == user

基本上是在尝试执行 user.user == user

如果您所讨论的User实例是登录用户，您似乎只想让用户更新User模型属性。

Looks like you're trying to only let users update the User model attributes if the User instance in question is the logged-in user.

尝试以下操作：

can :update, User, :id => user.id

说可以在 @user时更新用户模型.id 与 current_user.id 相同。

您的块符号是模糊的，因为您的块变量 | user | 与传递给Ability模型的 user 相同。

Your block notation is ambiguous since your block variable |user| is the same as the user passed in to the Ability model.

作为那些仍然对Ruby有所了解的人的补充说明，

As a side-note for those still getting a grip on Ruby,

can :update, User, :id => user.id

等同于：

can(:update, User, { id: user.id })

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