undefined method `full_name' for nil:NilClass --- <%= @status.user.full_name %>

class User < ActiveRecord::Base
  # Include default devise modules. Others available are:
  # :confirmable, :lockable, :timeoutable and :omniauthable
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable

  attr_accessible :email, :password, :password_confirmation, :remember_me, :first_name,
                  :last_name, :profile_name

  def full_name
    first_name + " " + last_name
  end

end  ``` 


  ```status.rb

class Status < ActiveRecord::Base
    attr_accessible :content, :user_id
    belongs_to :user
end ``` 


  ```show.html.erb

<p id="notice"><%= notice %></p>

<p>
  <strong>Name:</strong>
  <%= @status.user.full_name %>
</p>

<p>
  <strong>Content:</strong>
  <%= @status.content %>
</p>

<%= link_to 'Edit', edit_status_path(@status) %> |
<%= link_to 'Back', statuses_path %> ``` 


  ```Indext.html.erb

<div class="page-header">
<h1>Statuses</h1>
</div>

<%=link_to "Post a New Status", new_status_path, class: "btn btn-success" %>
<% @statuses.each do |status| %>
<div class="status">
  <strong><%= status.user.full_name %></strong>
  <p><%= status.content %></p>
<div class="meta">
  <%= link_to time_ago_in_words(status.created_at) + " ago", status %>
  <span class="admin">
  |  <%= link_to "Edit", edit_status_path(status) %> |
    <%= link_to "Delete", status, method: :delete, data: {confirm: "Are you sure you want to delete this status?"} %> 
</div>
</div> ``` 


  ```user.rb
class User < ActiveRecord::Base
  # Include default devise modules. Others available are:
  # :confirmable, :lockable, :timeoutable and :omniauthable
  devise :database_authenticatable, :registerable,
         :recoverable, :rememberable, :trackable, :validatable

  attr_accessible :email, :password, :password_confirmation, :remember_me, :first_name,
                  :last_name, :profile_name

  def full_name
    first_name + " " + last_name
  end

end ```