/ events path处的NameError - 未定义的局部变量或方法

I'm quite new to rails and I'm using grape to build an API rails app.

我对rails非常陌生,我正在使用grape来构建API rails应用程序。

I've been getting this error message after I click on the 'Create Event' button :-

点击“创建活动”按钮后,我收到此错误消息: -

NameError at /events

undefined local variable or method `event_params' for #<EventsController:0x00000008f76400>  

The error points to the controller file for events,

该错误指向事件的控制器文件,

class EventsController < ApplicationController
   before_action :authenticate_user!
   before_action :authenticate_user_from_token!
   before_action :set_event, only: [:show, :edit, :update, :destroy]

 def index
   @events = Event.all
    if user_signed_in?
     if current_user.is_admin?
       @events = Event.all

       respond_to do |format|
         format.html
         format.json { render json: @events }
       end

     else
      @events = current_user.events
      respond_to do |format|
        format.html
        format.json { render json: @events }
      end
     end
   else
    render json: {}, status: :unauthorized
   end
 end

 def new
  @event = Event.new
 end

 def edit
 end

 def create
  @event = current_user.events.new(event_params)
  respond_to do |format|

     if @event.save
       format.html { redirect_to @event, notice: 'Event was successfully created.' }

       format.json { render :show, status: :created, location: @event }

     else
       format.html { render :show, notice: 'You are not allowed to view this.' }
       format.json { render json: {}, status: :unauthorized}
      end
    end
  end

And here's the event_params method,

这是event_params方法,

def event_params
  params.require(:event).permit(:event_name, :event_description, :event_date, :event_time)
end

The log file shows,

日志文件显示,

Started POST "/events" for 127.0.0.1 at 2015-08-10 14:38:16 +0800
Processing by EventsController#create as HTML
Parameters: {"utf8"=>"✓", "authenticity_token"=>"yRVn4uuxpMVejs/gsG004PIi2JRaWnovGBm7TweGgkf2XpTLzjOZNGanCRVVKSPAV6JzNRWmDzRRbq/dC2KOKQ==", "event"=>{"event_name"=>"ddwq", "event_description"=>"rqreqreqr", "event_date(1i)"=>"2015", "event_date(2i)"=>"8", "event_date(3i)"=>"10", "event_time(1i)"=>"2015", "event_time(2i)"=>"8", "event_time(3i)"=>"10", "event_time(4i)"=>"06", "event_time(5i)"=>"38"}, "commit"=>"Create Event"}
[1m[36mUser Load (1.6ms)[0m  [1mSELECT  "users".* FROM "users" WHERE "users"."id" = $1  ORDER BY "users"."id" ASC LIMIT 1[0m  [["id", 1]]
Completed 500 Internal Server Error in 34ms

NameError - undefined local variable or method `event_params' for #<EventsController:0x000000082a6540>:
app/controllers/events_controller.rb:37:in `create'
actionpack (4.2.0) lib/action_controller/metal/implicit_render.rb:4:in `send_action'
...
...
bin/rails:4:in `<main>'

Started POST "/__better_errors/beb9cf3b65f0e36a/variables" for 127.0.0.1 at 2015-08-10 14:38:16 +0800

4 个解决方案

#1

def create
  @event = current_user.events.new(event_params)
  respond_to do |format|

     if @event.save
       format.html { redirect_to @event, notice: 'Event was successfully created.' }

       format.json { render :show, status: :created, location: @event }

     else
     respond_to do |format|
       format.html { render :show, notice: 'You are not allowed to view this.' }
       format.json { render json: {}, status: :unauthorized}
   end
 end ##You have missed the end here

And here's the event_params method,

这是event_params方法,

def event_params
  params.require(:event).permit(:event_name, :event_description, :event_date, :event_time)
end

#2

Try build instead of new replace

尝试构建而不是新的替换

@event = current_user.events.new(event_params)

@event = current_user.events.new(event_params)

by

@event = current_user.events.build(event_params)`

@event = current_user.events.build(event_params)`

#3

The error message indicates that, event_params method is not available for the EventsController. I think you mistakenly put the event_params inside another method or missed an end to end the create method. It should be an instance method of your EventsController class.

错误消息指示event_params方法不可用于EventsController。我认为你错误地将event_params放在另一个方法中或错过了结束create方法的结束。它应该是EventsController类的实例方法。

This code should work as it is:

此代码应该按原样运行:

class EventsController < ApplicationController
  before_action :authenticate_user!
  before_action :authenticate_user_from_token!
  before_action :set_event, only: [:show, :edit, :update, :destroy]

  def index
    @events = Event.all
    if user_signed_in?
      if current_user.is_admin?
        @events = Event.all

        respond_to do |format|
          format.html
          format.json { render json: @events }
        end

      else
        @events = current_user.events
        respond_to do |format|
          format.html
          format.json { render json: @events }
        end
      end
    else
      render json: {}, status: :unauthorized
    end
  end

  def new
    @event = Event.new
  end

  def edit
  end

  def create
    @event = current_user.events.new(event_params)
    respond_to do |format|

      if @event.save
        format.html { redirect_to @event, notice: 'Event was successfully created.' }

        format.json { render :show, status: :created, location: @event }

      else
        format.html { render :show, notice: 'You are not allowed to view this.' }
        format.json { render json: {}, status: :unauthorized}
      end
    end
  end

  private

  def event_params
    params.require(:event).permit(:event_name, :event_description, :event_date, :event_time)
  end
end

#4

So, the error was a missing 'end' for show method which I didn't post that part.

因此,错误是show方法缺少'结束',我没有发布该部分。

I completely missed that part because the error was misleading and I assume that it has something to do with the event parameters since the error points there.

我完全错过了那个部分,因为错误是误导性的,我认为它与事件参数有关,因为错误指向那里。