Question

I have 2 related models.

class Store < ActiveRecord::Base
  attr_accessible :name, :subdomain
  belongs_to  :theme
end

class Theme < ActiveRecord::Base
  attr_accessible :name, :description, :screenshot_attributes
  has_many  :stores
end

Everything works fine the problem is when I try to access the theme’s name in the following way.

<% @stores.each do |store| %>
  <tr>
    <td><%= link_to store.subdomain, store %></td>
    <td><%= store.name %></td>
    <td><%= store.theme.name %></td>
    <td><%= link_to 'Go to Store', root_url(subdomain: store.subdomain) %></td>
    <td><%= link_to 'Edit', [:edit, store] %></td>
    <td><%= link_to 'Destroy', store, confirm: 'Are you sure?', method: :delete %></td>
  </tr>
<% end %>

This is the line that gets the error.

    <td><%= store.theme.name %></td>

And this is the message:

    undefined method `name' for nil:NilClass

What is the correct way to access the theme’s name value?

Thankyou!

Answer 1

Just because store.theme is nil. A usefull function is inspect. If you do:

<%= store.inspect %>

You will see theme_id is nil.