Undefined method for `before_filter'

Question

I am running into the following error despite the method being clearly defined in the next line.

undefined method `before_filter' for AuthorsController:Class 

I am following this tutorial.

Code snippet as follows:

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 

Using Sorcery as authentication, windows 10, visual code.

Answer 1

Try using

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

Instead of

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

before_filter has been deprecated in Rails 5.0 and removed in 5.1.

Answer 2

If you are getting this error in Rails version < 5, check whether you have inherited your controller from action controller

class AuthorsController < ApplicationController end