`before_filter' 的未定义方法

Question

尽管在下一行中明确定义了方法，但我运行遇到了以下错误。

undefined method `before_filter' for AuthorsController:Class

我正在关注这个tutorial。

代码片段如下：

authors_controller.rb

class AuthorsController < ApplicationController

  before_action :set_author, only: [:show, :edit, :update, :destroy]
  before_filter :zero_authors_or_authenticated, only: [:new, :create] 

  def zero_authors_or_authenticated
    # If either one of them is true this filter won’t do anything, allowing the requested user registration form to be rendered
    unless Author.count == 0 || current_user # checking if there are either zero registered users OR if there is a user already logged in
      redirect_to root_path # if neither are true, then redirect to root_path and return false
      return false
    end
  end

  # GET /authors
  # GET /authors.json
  def index
    @authors = Author.all
  end

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

  # GET /authors/new
  def new
    @author = Author.new
  end

  # GET /authors/1/edit
  def edit
  end

  # POST /authors
  # POST /authors.json
  def create
    @author = Author.new(author_params)

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

  # PATCH/PUT /authors/1
  # PATCH/PUT /authors/1.json
  def update
    respond_to do |format|
      if @author.update(author_params)
        format.html { redirect_to @author, notice: 'Author was successfully updated.' }
        format.json { render :show, status: :ok, location: @author }
      else
        format.html { render :edit }
        format.json { render json: @author.errors, status: :unprocessable_entity }
      end
    end
  end

  # DELETE /authors/1
  # DELETE /authors/1.json
  def destroy
    @author.destroy
    respond_to do |format|
      format.html { redirect_to authors_url, notice: 'Author was successfully destroyed.' }
      format.json { head :no_content }
    end
  end

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

    # Never trust parameters from the scary internet, only allow the white list through.
    def author_params
      params.require(:author).permit(:username, :email, :password, :password_confirmation)
    end
end

使用巫术作为身份验证，windows 10，视觉代码。

Answer 1

尝试使用

before_action :zero_authors_or_authenticated, only: [:new, :create]

而不是

before_filter :zero_authors_or_authenticated, only: [:new, :create]

before_filter 已在 Rails 5.0 中弃用并在 5.1 中删除。

Answer 2

如果您在 Rails 版本 < 5 中遇到此错误，请检查您是否从动作控制器继承了您的控制器

class AuthorsController < ApplicationController
end

Answer 3

rails 版本 5.2

上的 milia 设置

Gemfile:

gem 'devise'
gem 'milia'

应用程序控制器：

class ApplicationController < ActionController::Base
  before_action :authenticate_tenant! 
end

devise_permitted_parameter.rb:

  included do
    before_filter :configure_permitted_parameters
  end

以上改为

included do
    before_action :configure_permitted_parameters
  end

运行命令： rails克milia:install--org_email='do-not-reply@local-test.dev'

重要提示：当它要求覆盖时说不（N） devise_permitted_parameter.rb 文件

`before_filter' 的未定义方法

Undefined method for `before_filter'

ruby-on-rails-5.1