NoMethodError in PagesController#home - ruby-on-rails

Question

I'm working through the Rails Tutorial Chapter 12, and get the following error on the Home/Main page when user is signed out (signed in is OK):
I'm a newbie to Rails so please be explicit in your response! Many thanks..
NoMethodError in PagesController#home
undefined method `feed' for nil:NilClass
Rails.root: /Users/fkhalid2008/Documents/First-app
Application Trace | Framework Trace | Full Trace
app/controllers/pages_controller.rb:6:in `home'
Pages Controller
class PagesController < ApplicationController
def home
#title = "Home"
#post = Post.new if signed_in?
#feed_items = current_user.feed.paginate(:page => params[:page])
end
def contact
#title = "Contact"
end
def about
#title = "About Us"
end
end
Home Page View (/app/views/pages/home.html.erb)
<% if signed_in? %>
<table class="front" summary="For signed-in users">
<tr>
<td class="main">
<h1 class="post">What's up?</h1>
<%= render 'shared/post_form' %>
<%= render 'shared/feed' %>
</td>
<td class="sidebar round">
<%= render 'shared/user_info' %>
</td>
</tr>
</table>
<% else %>
<h1>Palazzo Valencia</h1>
<p>
This is the home page for the
Palazzo Valencia
sample application.
</p>
<%= link_to "Sign up now!", signup_path, :class => "signup_button round" %>
<% end %>
Feed Partial
<% unless #feed_items.empty? %>
<table class="posts" summary="User posts">
<%= render :partial => 'shared/feed_item', :collection => #feed_items %>
</table>
<%= will_paginate #feed_items %>
<% end %>
Feed_item Partial
<tr>
<td class="gravatar">
<%= link_to gravatar_for(feed_item.user), feed_item.user %>
</td>
<td class="post">
<span class="user">
<%= link_to feed_item.user.name, feed_item.user %>
</span>
<span class="content"><%= feed_item.content %></span>
<span class="timestamp">
Posted <%= time_ago_in_words(feed_item.created_at) %> ago.
</span>
</td>
<% if current_user?(feed_item.user) %>
<td>
<%= link_to "delete", feed_item, :method => :delete,
:confirm => "You sure?",
:title => feed_item.content %>
</td>
<% end %>
</tr>

Answer 1

The user is not signed in. Therefore, the current_user method is returning nil, and ruby can't find the feed method.
You could change the code to this:
#title = "Home"
if signed_in?
#post = Post.new
#feed_items = current_user.feed.paginate(:page => params[:page])
end
Now, the new post and the feed items will only be retrieved when the user is signed in.

Answer 2

app/controllers/static_pages_controller.rb
def home
if logged_in?
#micropost = current_user.microposts.build
#feed_items = current_user.feed.paginate(page: params[:page])
end
end