Rails before_filter未命中數據庫

在我的應用程序中，我只想讓具有管理員權限的用戶訪問此模型。所以我設置了before_filter來檢查用戶是否是Admin。這種方法的問題在於，在admin用戶通過過濾器之後，他/她將無法重定向到該操作。相反，只有視圖被渲染，這導致了undefined method each' for nil:NilClass error。我在這裏做錯了什麼？Rails before_filter未命中數據庫

class TidbitsController < ApplicationController 
    before_filter :is_admin? 
    layout "tidbits" 
     # GET /tidbits 
     # GET /tidbits.json 
     protected  
     def is_admin? 
     unless current_user.admin? 
     flash[:error] = "You are not authorized!" 
     redirect_to "/" and return 
     end 
     end 

     def index 
     @tidbits = Tidbit.all 

     respond_to do |format| 
      format.html # index.html.erb 
      format.json { render json: @tidbits } 
     end 
     end 

     # GET /tidbits/1 
     # GET /tidbits/1.json 
     def show 
     @tidbit = Tidbit.find(params[:id]) 

     respond_to do |format| 
      format.html # show.html.erb 
      format.json { render json: @tidbit } 
     end 
     end 

     # GET /tidbits/new 
     # GET /tidbits/new.json 
     def new 
     @tidbit = Tidbit.new 

     respond_to do |format| 
      format.html # new.html.erb 
      format.json { render json: @tidbit } 
     end 
     end 

     # GET /tidbits/1/edit 
     def edit 
     @tidbit = Tidbit.find(params[:id]) 
     end 

     # POST /tidbits 
     # POST /tidbits.json 
     def create 
     @tidbit = Tidbit.new(params[:tidbit]) 

     respond_to do |format| 
      if @tidbit.save 
      format.html { redirect_to @tidbit, notice: 'Tidbit was successfully created.' } 
      format.json { render json: @tidbit, status: :created, location: @tidbit } 
      else 
      format.html { render action: "new" } 
      format.json { render json: @tidbit.errors, status: :unprocessable_entity } 
      end 
     end 
     end 

     # PUT /tidbits/1 
     # PUT /tidbits/1.json 
     def update 
     @tidbit = Tidbit.find(params[:id]) 

     respond_to do |format| 
      if @tidbit.update_attributes(params[:tidbit]) 
      format.html { redirect_to @tidbit, notice: 'Tidbit was successfully updated.' } 
      format.json { head :no_content } 
      else 
      format.html { render action: "edit" } 
      format.json { render json: @tidbit.errors, status: :unprocessable_entity } 
      end 
     end 
     end 

     # DELETE /tidbits/1 
     # DELETE /tidbits/1.json 
     def destroy 
     @tidbit = Tidbit.find(params[:id]) 
     @tidbit.destroy 

     respond_to do |format| 
      format.html { redirect_to tidbits_url } 
      format.json { head :no_content } 
     end 
     end 

    end

來源

2012-09-10 zsljulius

在你的例子你所有的行動方法protected所以也許這就是問題所在？

來源

2012-09-10 22:58:10

我不知道怎麼感謝你了。但我記得把is_admin？方法直到底部，它也無法工作。儘管如此，當我把它搬下來的時候，它就起作用了！ – zsljulius

我想你忘了加上色器件所需的回調過濾

before_filter :authenticate_user! 
before_filter :is_admin?

來源

2012-09-10 23:08:28 Azzurrio

感謝您的回答。我確實在我的application_controller.rb中有這個。原因很簡單，我不應該像@Radek建議的那樣在頂部聲明受保護的方法。 – zsljulius

Rails before_filter未命中數據庫

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