ruby on rails 5.1 - only - Método indefinido para `before_filter ''

ruby on rails syntax

Question

Estoy corriendo en el siguiente error a pesar de que el método está claramente definido en la siguiente línea.

undefined method `before_filter'' for AuthorsController:Class

Estoy siguiendo este tutorial .

Fragmento de código de la siguiente manera:

autores_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

Usando la brujería como autenticación, Windows 10, código visual.

Answer 1

Intenta usar

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

En lugar de

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

before_filter ha sido desaprobado en Rails 5.0 y eliminado en 5.1.

Answer 2

Si recibe este error en la versión de Rails <5, compruebe si ha heredado su controlador del controlador de acción

class AuthorsController < ApplicationController
end