rails 配置问题专家

Question

我使用 rails 4.2.4 构建了一个网络应用程序，设计了一个引脚脚手架，用户可以在其中对引脚进行 CRUD。

我要给自己下药，让专家工作，这样只有管理员才能对 pin 进行 CRUD，所有登录的用户或来宾只能查看，不能创建、更新或销毁。

我收到一连串这样的错误>

事实：

我有 2 个模型 pin.rb 和 user.rb

我有一个pins_controller.rb

我完成了迁移 add_admin_to_users.rb（除此之外我还需要进一步干预控制台来为管理员设置一些东西）

我能得到有关语法和失败方法的帮助吗

class ApplicationPolicy
  attr_reader :user, :pin

  def initialize(user, pin)
    raise Pundit::NotAuthorizedError, "must be logged in" unless user
    @user = user
    @pin = pin
  end

  def index?
    true
  end

  def show?
    scope.where(:id => record.id).exists?
  end

  def create?
    user.admin? 
  end

  def new?
    user.admin? 
  end

  def update?
    user.admin? 
  end

  def edit?
    update?
  end

  def destroy?
    user.admin? 
  end

  def scope
    Pundit.policy_scope!(user, record.class)
  end

  class Scope
    attr_reader :user, :scope

    def initialize(user, scope)
      @user = user
      @scope = scope
    end

    def resolve
      scope
    end
  end
end

Blockquote

class PinsController < ApplicationController
  before_action :set_pin, only: [:show, :edit, :update, :destroy]
  before_action :correct_user, only: [:edit, :update, :destroy]
  before_action :authenticate_user!, except: [:index, :show]

  def index
    if params[:search].present? && !params[:search].nil?
      @pins = Pin.where("description LIKE ?", "%#{params[:search]}%").paginate(:page => params[:page], :per_page => 15)
    else
      @pins = Pin.all.order("created_at DESC").paginate(:page => params[:page], :per_page => 15)
    end
  end


  def show

  end


  def new
    @pin = current_user.pins.build
  end


  def edit
  end


  def create
    @pin = current_user.pins.build(pin_params)
    if @pin.save
      redirect_to @pin, notice: 'Pin was successfully created.'
    else
      render :new
    end
  end


  def update
    if @pin.update(pin_params)
      redirect_to @pin, notice: 'Pin was successfully updated.'
    else
      render :edit
    end
  end


  def destroy
    @pin.destroy
    redirect_to pins_url
  end


private
    # Use callbacks to share common setup or constraints between actions.
    def set_pin
      @pin = Pin.find_by(id: params[:id])
    end

    def correct_user
      @pin = current_user.pins.find_by(id: params[:id])
      redirect_to pins_path, notice: "Not authorized to edit this pin" if @pin.nil?
    end

    # Never trust parameters from the scary internet, only allow the white list through.
    def pin_params
      params.require(:pin).permit(:description, :image)
    end
end

Blockquote

class ApplicationController < ActionController::Base
 include Pundit
 rescue_from Pundit::NotAuthorizedError, with: :user_not_authorized
 protect_from_forgery with: :exception
 before_filter :configure_permitted_parameters, if: :devise_controller?

 protected

 def configure_permitted_parameters
    devise_parameter_sanitizer.for(:sign_up) << :name
    devise_parameter_sanitizer.for(:account_update) << :name
 end

 private

 def user_not_authorized
   flash[:warning] = "You are not authorized to perform this action."
   redirect_to(request.referrer || root_path)
 end
end

Answer 1

错误的发生很可能只是因为这个事实，好吧，正如异常所述，没有 PinPolicy class。除了一般 ApplicationPolicy 您还应该为每个资源定义策略（继承自 main ApplicationPolicy）。

在/policies目录下添加：

class PinPolicy < ApplicationPolicy
  class Scope < Scope
    def resolve
      return scope if user.admin?
      fail 'scope is not defined'
    end
  end
end

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