Question

这是我正在尝试制作的应用程序的文件（来自Hartl教程，它只是一个基本的Twitter应用程序）。直到我在浏览器建议的最底部添加了第三个“结束”时，网站才加载，但我无法弄清楚为什么需要这样做。我得到所有“def”需要一个关键字“end”，但为什么代码末尾有3个“end”。

class UsersController < ApplicationController
  before_action :signed_in_user,
                only: [:index, :edit, :update, :destroy, :following, :followers]
  before_action :correct_user,   only: [:edit, :update]
  before_action :admin_user,     only: :destroy

    def index
     @users = User.paginate(page: params[:page])
    end 


    def show
      @user = User.find(params[:id])
      @microposts = @user.microposts.paginate(page: params[:page])
    end

    def destroy
      User.find(params[:id]).destroy
      flash[:success] = "User deleted."
      redirect_to users_url
    end

    def new
      @user = User.new
    end

    def edit
    end

      def update
      if @user.update_attributes(user_params)
        flash[:success] = "Profile updated"
        redirect_to @user
      else
        render 'edit'
      end


      def create
      @user = User.new(user_params)
      if @user.save
        sign_in @user
        flash[:success] = "Welcome to the Sample App!"
        redirect_to @user
      else
        render 'new'
      end

     def following
      @title = "Following"
      @user = User.find(params[:id])
      @users = @user.followed_users.paginate(page: params[:page])
      render 'show_follow'
     end

      def followers
        @title = "Followers"
        @user = User.find(params[:id])
        @users = @user.followers.paginate(page: params[:page])
        render 'show_follow'
      end



   private

      def user_params
        params.require(:user).permit(:name, :email, :password,
                                     :password_confirmation)
      end

      # Before filters


      def correct_user
        @user = User.find(params[:id])
        redirect_to(root_url) unless current_user?(@user)
      end

      def admin_user
        redirect_to(root_url) unless current_user.admin?
      end
end
end
end

Answer 1

将end添加到update和create方法，因为方法未关闭。此外，在底部的3个end中，移除两个 end，只留下one为您的课程结束。

    def update
      if @user.update_attributes(user_params)
        flash[:success] = "Profile updated"
        redirect_to @user
      else
        render 'edit'
      end
    end    ## This end was missing

    def create
      @user = User.new(user_params)
      if @user.save
        sign_in @user
        flash[:success] = "Welcome to the Sample App!"
        redirect_to @user
      else
        render 'new'
      end
    end   ## This end was missing

Answer 2

following并且在create方法中定义了私有方法，该方法是在update方法中创建的。我怀疑你想这样做。因此，文件末尾的三个end关闭create，然后关联update，然后关闭该类。在end条款之后你需要一个if，也许这就是引起混淆的原因。

Answer 3

您错过了更新方法的结束（可能是由于缩进造成的疏忽）。
您错过了创建方法的结尾（可能是由于缩进造成的疏忽）。
课程本身需要结束

正确格式化它应该如下：

class UsersController < ApplicationController
  before_action :signed_in_user,
                only: [:index, :edit, :update, :destroy, :following, :followers]
  before_action :correct_user,   only: [:edit, :update]
  before_action :admin_user,     only: :destroy

  def index
   @users = User.paginate(page: params[:page])
  end 


  def show
    @user = User.find(params[:id])
    @microposts = @user.microposts.paginate(page: params[:page])
  end

  def destroy
    User.find(params[:id]).destroy
    flash[:success] = "User deleted."
    redirect_to users_url
  end

  def new
    @user = User.new
  end

  def edit
  end

  def update
    if @user.update_attributes(user_params)
      flash[:success] = "Profile updated"
      redirect_to @user
    else
      render 'edit'
    end
  end

  def create
    @user = User.new(user_params)
    if @user.save
      sign_in @user
      flash[:success] = "Welcome to the Sample App!"
      redirect_to @user
    else
      render 'new'
    end
  end

  def following
    @title = "Following"
    @user = User.find(params[:id])
    @users = @user.followed_users.paginate(page: params[:page])
    render 'show_follow'
  end

  def followers
    @title = "Followers"
    @user = User.find(params[:id])
    @users = @user.followers.paginate(page: params[:page])
    render 'show_follow'
  end

  private

  def user_params
    params.require(:user).permit(:name, :email, :password,
                                 :password_confirmation)
  end

  # Before filters

  def correct_user
    @user = User.find(params[:id])
    redirect_to(root_url) unless current_user?(@user)
  end

  def admin_user
    redirect_to(root_url) unless current_user.admin?
  end
end

结束关键字的语法说明

3 个答案: