Question

我使用devise和cancan宝石并拥有简单的模型关联：user has_many subscriptions，subscription belongs_to :user。请关注SubscriptionsController：

class SubscriptionsController < ApplicationController

  load_and_authorize_resource :user
  load_and_authorize_resource :subscription, through: :user

  before_filter :authenticate_user!

  def index
    @subscriptions = @user.subscriptions.paginate(:page => params[:page]).order(:created_at)
  end

  #other actions
end

Cancan Ability.rb：

class Ability
  include CanCan::Ability

  def initialize(user)

    user ||=User.new

    can [:read], [Edition, Kind]

    if user.admin?
      can :manage, :all
    elsif user.id
      can [:read, :create, :destroy, :pay], Subscription, user_id: user.id
      can [:delete_from_cart, :add_to_cart, :cart], User, id: user.id
    end

  end

end

问题在于我无法将subscriptions操作用作用户，但可以作为管理员使用。并且UsersController没有问题。当我从SubscriptionsController删除以下行时：

  load_and_authorize_resource :user
  load_and_authorize_resource :subscription, through: :user

  before_filter :authenticate_user!

完全没有问题。所以这些问题或Ability.rb中的问题。有什么建议吗？

更新：有趣的是，如果我向html模板添加类似can? :index, Subscription的smth，则会显示true。如果添加can? :index, Subscription.first（另一个用户的订阅）等smth，则会显示false。看起来像Cancan正常工作。但问题是什么？..

更新：如果更改SubscriptionsControlle，请执行以下操作：

class SubscriptionsController < ApplicationController

  #load_and_authorize_resource :user
  #load_and_authorize_resource :subscription, through: :user

  before_filter :authenticate_user!

  def show
    @user = User.find params[:user_id] #line 1
    @subscription = @user.subscriptions.find params[:id] #line 2
    @container_items = @subscription.container_items.paginate(:page => params[:page])
    authorize! :show, @subscription #line 4
  end

  #some actions
end

它非常完美，可以在需要时防止未经授权的用户访问。第1，第2和第4行不等于注释？..

更新：在routes.rb中有以下内容：

resources :users, except: [:show] do
    member do
      get 'cart'
      delete 'delete_from_cart' => 'users#delete_from_cart'
      post 'add_to_cart' => 'users#add_to_cart'
    end
    resources :subscriptions do
      member do
        post 'pay'
      end
    end
  end

更新：下一个解决方案可防止对index以外的所有订阅操作进行未经授权的访问：

class SubscriptionsController < ApplicationController

  load_resource :user
  load_resource :subscription, through: :user
  authorize_resource through: :current_user

  before_filter :authenticate_user!

  #actions
end

那么阻止访问index行动的最佳方式是什么？

仅找到以下解决方案：

  before_filter :authorize_index, only: [:index]

  def authorize_index
    raise CanCan::AccessDenied unless params[:user_id] == current_user.id.to_s
  end

Answer 1

应该是

load_and_authorize_resource :subscription

或只是

load_and_authorize_resource

在你的情况下，当你想要嵌套资源时，那么

load_and_authorize_resource :through => :current_user

请参阅https://github.com/ryanb/cancan/wiki/Nested-Resources

设计和康康宝石：has_many协会

1 个答案: