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Ruby on rails 调用关联时设计当前用户的命名错误有多个模型_Ruby On Rails_Ruby - Fatal编程技术网

Ruby on rails 调用关联时设计当前用户的命名错误有多个模型

Ruby on rails 调用关联时设计当前用户的命名错误有多个模型,ruby-on-rails,ruby,Ruby On Rails,Ruby,我跟随了一个月的Rails,我被Pins用户和协会的视频卡住了。我只是不知道我的代码出了什么问题,任何帮助都将不胜感激 当我尝试访问我不是用户的pin时,我得到的不是警报和重定向,而是: NoMethodError in PinsController#edit undefined method `pins' for nil:NilClass 错误消息表示此行有问题: def correct_user @pin = current_user.pins.fin

我跟随了一个月的Rails,我被Pins用户和协会的视频卡住了。我只是不知道我的代码出了什么问题,任何帮助都将不胜感激

当我尝试访问我不是用户的pin时,我得到的不是警报和重定向,而是:

NoMethodError in PinsController#edit

undefined method `pins' for nil:NilClass
错误消息表示此行有问题:

        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
我试着重新启动整个程序,但遇到了同样的错误

这是我的PIN_控制器代码:

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
    @pins = Pin.all
  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 action: 'new'
    end
  end

  def update
    if @pin.update(pin_params)
      redirect_to @pin, notice: 'Pin was successfully updated.'
    else
      render action: '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(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)
    end
end
class PinsController
以下是我的user.rb型号代码:

class User < ActiveRecord::Base
      # Include default devise modules. Others available are:
      # :token_authenticatable, :confirmable,
      # :lockable, :timeoutable and :omniauthable
          devise :database_authenticatable, :registerable,
             :recoverable, :rememberable, :trackable, :validatable

      has_many :pins
    end
    class Pin < ActiveRecord::Base
        belongs_to :user
    end
class用户
以下是我的pin.rb型号代码:

class User < ActiveRecord::Base
      # Include default devise modules. Others available are:
      # :token_authenticatable, :confirmable,
      # :lockable, :timeoutable and :omniauthable
          devise :database_authenticatable, :registerable,
             :recoverable, :rememberable, :trackable, :validatable

      has_many :pins
    end
    class Pin < ActiveRecord::Base
        belongs_to :user
    end
class Pin
以下是github回购协议:

仔细查看错误消息:
“for nil:NilClass”
。这告诉您当前用户
nil
——当用户未登录时确实是这样

如果要确保用户已登录以访问
Pins
控制器,可以在控制器中使用
before\u action

class PinsController < ApplicationController
  before_action :authenticate_user!
class PinsController

authenticate\u user!
是designe声明的方法)。

我建议您更改
的顺序,然后再像这样进行筛选

class PinsController

因为您应该首先使用designe对用户进行身份验证,然后才检查它是否是正确的用户。

您如何定义
当前用户
,您在哪里实例化它?错误代码表明当前用户不存在(为零)。这很有效,非常感谢!这似乎是一个非常简单的解决方案,我想我应该试着思考事情发生的顺序,而不是遵循教程。