ruby-on-rails - Rails 4.2.7、Pundit、Mongoid 和 RailsAdmin 的未定义方法“to_criteria”

Question

我有一个带有 rails_admin (0.8.1)、pundit (1.1.0) 和 mongoid (5.1.4) 的 Rails 4.2.7 应用程序

我创建了 Campaign 脚手架并添加authorize @campaign到set_campaignCampaignController 中。当我浏览到http://localhost:3000/campaigns/57b34dd3f5740c23d3066e43我得到unable to find policyCampaignPolicyfor <Campaign _id ...

我跑去rails g pundit:policy campaign创建 CampaignPolicy，现在展示行动作品。但是当我浏览到 RailsAdmin http://localhost:3000/admin/campaign我得到：

undefined method `to_criteria' for Campaign:Class
lib/mongoid/criteria.rb merge! method

我通过像这样修改 CampaignPollicy 中的 Scope 来“解决”它，但我想知道是否有更好的解决方案

class CampaignPolicy < ApplicationPolicy
  def show?
    true
  end
  class Scope
    attr_reader :user, :scope
        def initialize(user, scope)
      @user = user
      @scope = scope
    end
    def resolve
    end
  end
end

Answer 1

好的，想通了，我想我会分享答案。

class CampaignPolicy < ApplicationPolicy
  ...
  class Scope
    def resolve
      if @user.admin?
        scope.all  # this prevents undefined method `to_criteria'
      else
        scope.where(...) # put some biz logic here
      end
    end
  end
end