Question

我正在尝试使用cancan来处理多态关联，我已经阅读了文档和wiki并且无法使其工作...

我有以下型号：

class User < ActiveRecord::Base
  has_many :areas, :as => :owner, :dependent => :destroy            
end 

class Account < ActiveRecord::Base  
  has_many :areas, :as => :owner, :dependent => :destroy
end

class Area < ActiveRecord::Base   
  belongs_to :owner, :polymorphic => true
end

并在控制器中：

class AreasController < ApplicationController  

  load_resource :user, :instance_name => :owner
  load_resource :account, :instance_name => :owner
  load_and_authorize_resource :area, :through => :owner

  before_filter :authorize_parent

  respond_to :html

  def authorize_parent
    authorize! :manage, @owner
  end    

  def index   
  end          

  def show
    @events = @area.events.page(params[:page]).per(5)
    respond_with @area
  end

  def new 
    respond_with @area
  end               

  def create                                
    @area = @owner.areas.new(params[:area])   
    if @area.save
      flash[:notice] = "Your new area has been created..."
    end  
    respond_with @area
  end

end

以及以下能力：

  can :manage, Area, :owner => { :memberships => { :user => { :id => user.id } } } # Accounts through Membership     
  can :manage, Area, :owner => { :id => user.id } # User

new和create actions对user_areas和account_areas都有用，但是当我尝试去区域的索引操作时，我得到以下错误：

NameError in AreasController#index

uninitialized constant Owner

有什么想法？非常感谢

Answer 1

它认为您的班级名为Owner，也许您可以尝试：

load_resource :user, :instance_name => :owner, :class=>'User'
load_resource :account, :instance_name => :owner, :class=>'Account'
load_and_authorize_resource :area, :through => :owner

如果不起作用，请查看此问题是否解决了您的问题：https://github.com/ryanb/cancan/issues/73

如果您使用的是1.3或更高版本，则根据故障单，您可以执行以下操作：

load_resource :user
load_resource :account
load_and_authorize_resource :area, :through => [:user, :account]

但在这种情况下，您的authorize_parent方法会发生如下变化：

def authorize_parent
  authorize! :manage, (@user||@account)
end

有关详细文档，请参阅标题Polymorphic associations：https://github.com/ryanb/cancan/wiki/Nested-Resources

让我知道是否适合您。干杯安迪;）

Rails + CanCan + Polymorphic Association无法按预期工作

1 个答案: