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NoMethodError雖然已定義方法

2016-10-31 60 views
1

我有一個Ruby On Rails博客應用程序，在打開帖子時出現NoMethodError in PostsController#show問題。 PostsController存儲在rails/weblog/app/controllersNoMethodError雖然已定義方法

我得到undefined method 'set_current_page' for #<PostsController:0x007fb162831e70>然而set_current_page的定義，像這樣：

private 
    def set_current_page 
     @current_page = params[:page] || 1 
    end 
end

，然後在before_action

before_action :set_current_page, except: [:index] 
before_action :set_post, only: [:show, :edit, :update, :destroy]

完整的堆棧跟蹤使用：

activesupport (5.0.0.1) lib/active_support/callbacks.rb:382:in `block in make_lambda' 
activesupport (5.0.0.1) lib/active_support/callbacks.rb:150:in `block (2 levels) in halting_and_conditional' 
actionpack (5.0.0.1) lib/abstract_controller/callbacks.rb:12:in `block (2 levels) in <module:Callbacks>' 
activesupport (5.0.0.1) lib/active_support/callbacks.rb:151:in `block in halting_and_conditional' 
activesupport (5.0.0.1) lib/active_support/callbacks.rb:454:in `block in call' 
activesupport (5.0.0.1) lib/active_support/callbacks.rb:454:in `each' 
activesupport (5.0.0.1) lib/active_support/callbacks.rb:454:in `call' 
activesupport (5.0.0.1) lib/active_support/callbacks.rb:101:in `__run_callbacks__' 
activesupport (5.0.0.1) lib/active_support/callbacks.rb:750:in `_run_process_action_callbacks' 
activesupport (5.0.0.1) lib/active_support/callbacks.rb:90:in `run_callbacks' 
actionpack (5.0.0.1) lib/abstract_controller/callbacks.rb:19:in `process_action' 
actionpack (5.0.0.1) lib/action_controller/metal/rescue.rb:20:in `process_action' 
actionpack (5.0.0.1) lib/action_controller/metal/instrumentation.rb:32:in `block in process_action' 
activesupport (5.0.0.1) lib/active_support/notifications.rb:164:in `block in instrument' 
activesupport (5.0.0.1) lib/active_support/notifications/instrumenter.rb:21:in `instrument' 
activesupport (5.0.0.1) lib/active_support/notifications.rb:164:in `instrument' 
actionpack (5.0.0.1) lib/action_controller/metal/instrumentation.rb:30:in `process_action' 
actionpack (5.0.0.1) lib/action_controller/metal/params_wrapper.rb:248:in `process_action' 
activerecord (5.0.0.1) lib/active_record/railties/controller_runtime.rb:18:in `process_action' 
actionpack (5.0.0.1) lib/abstract_controller/base.rb:126:in `process' 
actionview (5.0.0.1) lib/action_view/rendering.rb:30:in `process' 
actionpack (5.0.0.1) lib/action_controller/metal.rb:190:in `dispatch' 
actionpack (5.0.0.1) lib/action_controller/metal.rb:262:in `dispatch' 
actionpack (5.0.0.1) lib/action_dispatch/routing/route_set.rb:50:in `dispatch' 
actionpack (5.0.0.1) lib/action_dispatch/routing/route_set.rb:32:in `serve' 
actionpack (5.0.0.1) lib/action_dispatch/journey/router.rb:39:in `block in serve' 
actionpack (5.0.0.1) lib/action_dispatch/journey/router.rb:26:in `each' 
actionpack (5.0.0.1) lib/action_dispatch/journey/router.rb:26:in `serve' 
actionpack (5.0.0.1) lib/action_dispatch/routing/route_set.rb:725:in `call' 
rack (2.0.1) lib/rack/etag.rb:25:in `call' 
rack (2.0.1) lib/rack/conditional_get.rb:25:in `call' 
rack (2.0.1) lib/rack/head.rb:12:in `call' 
rack (2.0.1) lib/rack/session/abstract/id.rb:222:in `context' 
rack (2.0.1) lib/rack/session/abstract/id.rb:216:in `call' 
actionpack (5.0.0.1) lib/action_dispatch/middleware/cookies.rb:613:in `call' 
activerecord (5.0.0.1) lib/active_record/migration.rb:552:in `call' 
actionpack (5.0.0.1) lib/action_dispatch/middleware/callbacks.rb:38:in `block in call' 
activesupport (5.0.0.1) lib/active_support/callbacks.rb:97:in `__run_callbacks__' 
activesupport (5.0.0.1) lib/active_support/callbacks.rb:750:in `_run_call_callbacks' 
activesupport (5.0.0.1) lib/active_support/callbacks.rb:90:in `run_callbacks' 
actionpack (5.0.0.1) lib/action_dispatch/middleware/callbacks.rb:36:in `call' 
actionpack (5.0.0.1) lib/action_dispatch/middleware/executor.rb:12:in `call' 
actionpack (5.0.0.1) lib/action_dispatch/middleware/remote_ip.rb:79:in `call' 
actionpack (5.0.0.1) lib/action_dispatch/middleware/debug_exceptions.rb:49:in `call' 
web-console (3.4.0) lib/web_console/middleware.rb:135:in `call_app' 
web-console (3.4.0) lib/web_console/middleware.rb:28:in `block in call' 
web-console (3.4.0) lib/web_console/middleware.rb:18:in `catch' 
web-console (3.4.0) lib/web_console/middleware.rb:18:in `call' 
actionpack (5.0.0.1) lib/action_dispatch/middleware/show_exceptions.rb:31:in `call' 
railties (5.0.0.1) lib/rails/rack/logger.rb:36:in `call_app' 
railties (5.0.0.1) lib/rails/rack/logger.rb:24:in `block in call' 
activesupport (5.0.0.1) lib/active_support/tagged_logging.rb:70:in `block in tagged' 
activesupport (5.0.0.1) lib/active_support/tagged_logging.rb:26:in `tagged' 
activesupport (5.0.0.1) lib/active_support/tagged_logging.rb:70:in `tagged' 
railties (5.0.0.1) lib/rails/rack/logger.rb:24:in `call' 
sprockets-rails (3.2.0) lib/sprockets/rails/quiet_assets.rb:13:in `call' 
actionpack (5.0.0.1) lib/action_dispatch/middleware/request_id.rb:24:in `call' 
rack (2.0.1) lib/rack/method_override.rb:22:in `call' 
rack (2.0.1) lib/rack/runtime.rb:22:in `call' 
activesupport (5.0.0.1) lib/active_support/cache/strategy/local_cache_middleware.rb:28:in `call' 
actionpack (5.0.0.1) lib/action_dispatch/middleware/executor.rb:12:in `call' 
actionpack (5.0.0.1) lib/action_dispatch/middleware/static.rb:136:in `call' 
rack (2.0.1) lib/rack/sendfile.rb:111:in `call' 
railties (5.0.0.1) lib/rails/engine.rb:522:in `call' 
puma (3.6.0) lib/puma/configuration.rb:225:in `call' 
puma (3.6.0) lib/puma/server.rb:578:in `handle_request' 
puma (3.6.0) lib/puma/server.rb:415:in `process_client' 
puma (3.6.0) lib/puma/server.rb:275:in `block in run' 
puma (3.6.0) lib/puma/thread_pool.rb:116:in `block in spawn_thread'

posts_co ntroller.rb文件：

class PostsController < ApplicationController 
    before_action :set_current_page, except: [:index] 
    before_action :set_post, only: [:show, :edit, :update, :destroy] 

    # GET /posts 
    # GET /posts.json 
    def index 
     @posts = Post.paginate(page: params[:page], 
          per_page: params[:per_page]) 
          .order('title, user_id') 
    end 

    # GET /posts/1 
    # GET /posts/1.json 
    def show 
    end 

    # GET /posts/new 
    def new 
     @post = Post.new 
    end 

    # GET /posts/1/edit 
    def edit 
    end 

    # POST /posts 
    # POST /posts.json 
    def create 
     @post = Post.new(post_params) 
     @post.user = User.find_by email: params[:email] 

     respond_to do |format| 
      if @post.save 
       format.html { redirect_to (post_url(@post, page: @current_page)), notice: 'Post was successfully created.' } 
       format.json { render :show, status: :created, location: @post } 
      else 
       format.html { render :new } 
       format.json { render json: @post.errors, status: :unprocessable_entity } 
      end 
     end 
    end 

    # PATCH/PUT /posts/1 
    # PATCH/PUT /posts/1.json 
    def update 
     @post.user = User.find_by email: params[:email] 
     respond_to do |format| 
      if @post.update(post_params) 
       format.html { redirect_to (post_url(@post, page: @current_page)), notice: 'Post was successfully updated.' } 
       format.json { render :show, status: :ok, location: @post } 
      else 
       format.html { render :edit } 
       format.json { render json: @post.errors, status: :unprocessable_entity } 
      send 
     end 
    end 

    # DELETE /posts/1 
    # DELETE /posts/1.json 
    def destroy 
     @post.destroy 
     respond_to do |format| 
      format.html { redirect_to posts_url(page: @current_page), notice: 'Post was successfully destroyed.' } 
      format.json { head :no_content } 
     end 
    end 

    private 
     # Use callbacks to share common setup or constraints between actions. 
     def set_post 
      @post = Post.find(params[:id]) 
     end 

     def set_current_page 
      @current_page = params[:page] || 1 
     end 

     # Never trust parameters from the scary internet, only allow the white list through. 
     def post_params 
      params.require(:post).permit(:title, :body, :page) 
     end 
    end 
end

來源

2016-10-31 user3091905

+0

'set_current_page'定義在'posts_controller.rb'中？你可以包含完整的堆棧跟蹤嗎？ – SteveTurczyn

+0

堆棧跟蹤和控制器的全部內容將非常有用。 – ArtOfCode

+0

是的，set_current_page在posts_controller.rb的底部定義。我在完整的堆棧跟蹤中編輯了我的初始文章 – user3091905

回答

2

您的update行動錯字 - 的send代替end。

這意味着Ruby會將它之後的所有內容解釋爲該更新方法的一部分 - 並且它不在方法外部定義。

結合額外的end已包含在您的私人方法列表之後，這意味着您擁有正確的ends號碼，因此看不到語法錯誤，但該類沒有按您期望的方式解釋。

來源

2016-10-31 12:14:35 sevenseacat

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