Hartl Rails Tutorial Chapter 8.46 NoMethodError - ruby-on-rails

Question

one my my tests receiving the following error in Chapter 8 of Hartl's Rails Tutorial.
> 1) Error:
> UsersLoginTest#test_login_with_valid_information_followed_by_logout:
> NoMethodError: undefined method `forget' for #<Class:0x000000079be3b0>
> app/helpers/sessions_helper.rb:30:in `forget'
> app/helpers/sessions_helper.rb:37:in `log_out'
> app/controllers/sessions_controller.rb:18:in `destroy'
> test/integration/users_login_test.rb:40:in `block in <class:UsersLoginTest>'
I have tried copying and pasting code exactly as it is in the tutorial, but it doesn't seem to be solving the issue.
Here is my Sessions Helper
module SessionsHelper
def log_in(user)
session[:user_id] = user.id
end
def remember(user)
user.remember
cookies.permanent.signed[:user_id] = user.id
cookies.permanent[:remember_token] = user.remember_token
end
def current_user
if (user_id = session[:user_id])
#current_user ||= User.find_by(id: user_id)
elsif (user_id = cookies.signed[:user_id])
user = User.find_by(id: user_id)
if user && user.authenticated?(cookies[:remember_token])
log_in user
#current_user = user
end
end
end
def logged_in?
!current_user.nil?
end
def forget(user)
user.forget
cookies.delete(:user_id)
cookies.delete(:remember_token)
end
# Logs out the current user.
def log_out
forget(current_user)
session.delete(:user_id)
#current_user = nil
end
end
And my sessions controller is below
class SessionsController < ApplicationController
def new
end
def create
user = User.find_by(email: params[:session][:email].downcase)
if user && user.authenticate(params[:session][:password])
log_in user
remember user
redirect_to user
else
flash.now[:danger] = 'Invalid email/password combination'
render 'new'
end
end
def destroy
log_out if logged_in?
redirect_to root_url
end
end
Any suggestions would be very much appreciated!

Answer 1

Here we can see the importance of really looking closely at the error message. It says there is a "No Method Error". OK. So we're doing something with the Users and there's no method. A user is a modeled thing, so let's look at app/models/user.rb:
class User < ActiveRecord::Base
attr_accessor :remember_token
before_save { self.email = email.downcase }
validates :name, presence: true, length: { maximum: 50 }
VALID_EMAIL_REGEX = /\A[\w+\-.]+#[a-z\d\-.]+\.[a-z]+\z/i
validates :email, presence: true, length: { maximum: 255 },
format: { with: VALID_EMAIL_REGEX },
uniqueness: { case_sensitive: false }
has_secure_password
validates :password, presence: true, length: { minimum: 6 }
# Returns the hash digest of the given string.
def User.digest(string)
cost = ActiveModel::SecurePassword.min_cost ? BCrypt::Engine::MIN_COST :
BCrypt::Engine.cost
BCrypt::Password.create(string, cost: cost)
end
# Returns a random token.
def User.new_token
SecureRandom.urlsafe_base64
end
# Remembers a user in the database for use in persistent sessions.
def remember
self.remember_token = User.new_token
update_attribute(:remember_digest, User.digest(remember_token))
end
# Returns true if the given token matches the digest.
def authenticated?(remember_token)
BCrypt::Password.new(remember_digest).is_password?(remember_token)
end
# Forgets a user.
def forget
update_attribute(:remember_digest, nil)
end
end
we see that at the very end, there is a method being created called "forget"
def forget
#something
end
That opens up the method to calls from other controllers and helpers, which you've already created in the Sessions section.