authenticate_with_http_token method not found - ruby-on-rails

Question

I am making an api with ruby on rails, and I am trying to use token based authentication. Everything works just fine, but Rails is saying that the method authenticate_with_http_token is undefined.
This is the error it is giving:
{"status":500,"error":"Internal Server Error","exception":"#\u003cNoMethodError: undefined method `authenticate_with_http_token' for #\u003cUsersController:0x007fa8ac16dee0\u003e\u003e","traces":{"Application Trace":[{"id":0,"trace":"app/controllers/users_controller.rb:59:in `authenticate_token'"},{"id":1,"trace":"app/controllers/users_controller.rb:55:in `authenticate'"}],"Framework Trace":[{"id":2,"trace":"activesupport (5.0.0.beta3) lib/active_support/callbacks.rb:382:in `block in make_lambda'"}
This is the code for my controller:
class UsersController < ApplicationController
before_action :set_user, only: [:show, :update, :destroy]
before_action :authenticate, only: [:show, :update, :destroy]
# GET /users
def index
#users = User.all
render json: #users
end
# GET /users/1
def show
render json: #user
end
# POST /users
def create
#user = User.new(user_params)
if #user.save
render json: #user, status: :created, location: #user
else
render json: #user.errors, status: :unprocessable_entity
end
end
# PATCH/PUT /users/1
def update
if #user.update(user_params)
render json: #user
else
render json: #user.errors, status: :unprocessable_entity
end
end
# DELETE /users/1
def destroy
#user.destroy
end
private
# Use callbacks to share common setup or constraints between actions.
def set_user
#user = User.find(params[:id])
end
# Only allow a trusted parameter "white list" through.
def user_params
params.require(:user).permit(:first_name, :last_name, :email, :school_id, :auth_token, :password_digest)
end
def authenticate
authenticate_token || render_unauthorized
end
def authenticate_token
authenticate_with_http_token { |token, options| User.find_by(auth_token: token) }
end
end

Answer 1

Try to include that in your ApplicationController or UsersController
include ActionController::HttpAuthentication::Token::ControllerMethods

Answer 2

I guess you are trying to use the new Rails 5 API-only?
If so you probably inherited your ApplicationController from
class ApplicationController < ActionController::API
instead of
class ApplicationController < ActionController::Base
Please take note that ActionController::API is a downsized version of ActionController which does not include ALL modules. One of the ones left out is actually ActionController::HttpAuthentication::Token.
Including it in your ApplicationController (or a specialized controller if you just need it in one place) should fix it:
include ActionController::HttpAuthentication::Basic