NoMethodError While Doing Hartl's RailsTutorial - ruby-on-rails

Question

I'm running into a NoMethodError while working through Hartl's Rails Tutorial. This error started showing up in chapter 11. Not sure where to track the problem back to. This is the error message:
NoMethodError in StaticPagesController#home undefined method `signed_in?' for #<StaticPagesController:0x007fa1b44a4ab8>
Rails.root: /Users/dbk/projects/apster
Application Trace | Framework Trace | Full Trace
app/controllers/static_pages_controller.rb:4:in `home'
And here's the code from my StaticPagesController:
class StaticPagesController < ApplicationController
def home
if signed_in?
#micropost = current_user.microposts.build
#feed_items = current_user.feed.paginate(page: params[:page])
end
end
end
Here's my ApplicationController:
class ApplicationController < ActionController::Base
# Prevent CSRF attacks by raising an exception.
# For APIs, you may want to use :null_session instead.
protect_from_forgery with: :exception
include SessionsHelper
end
Here's my sessions helper file:
module SessionsHelper
def sign_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: session[:user_id])
elsif (user_id = cookies.signed[:user_id])
user = User.find_by(id: cookies.signed[: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
def sign_out
forget(current_user)
session.delete(:user_id)
#current_user = nil
end
def redirect_back_or(default)
redirect_to(session[:return_to] || default)
session.delete(:return_to)
end
def store_location
session[:return_to] = request.url if request.get?
end
end

Answer 1

A NoMethodError means exactly that. A method that does not exist, or is not loaded, was called. This happens because you called your method logged_in? in SessionsHelper.
def logged_in?
!current_user.nil?
end
But you are calling signed_in? in StaticPagesController, which does not exist, and hence the error.
def home
if signed_in?
# ...
end
end