title: Rails -- fields_for not working?
body: <p>When I run the rails server and go to the school/new page on my site, the field with the label "school" where I can enter the school's name appears, but all the other fields under fields_for which are for entering the school administrator's info do not show up on my site -- when I use "inspect element" on my form it is like they are not even there.  Why aren't they appearing on my page?</p>
  
  <pre><code>&lt;%= form_for(@school) do |f| %&gt;
    &lt;% if @school.errors.any? %&gt;
      &lt;div id="error_explanation"&gt;
        &lt;h2&gt;&lt;%= pluralize(@school.errors.count, "error") %&gt; prohibited this school from being saved:&lt;/h2&gt;
  
        &lt;ul&gt;
        &lt;% @school.errors.full_messages.each do |msg| %&gt;
          &lt;li&gt;&lt;%= msg %&gt;&lt;/li&gt;
        &lt;% end %&gt;
        &lt;/ul&gt;
      &lt;/div&gt;
    &lt;% end %&gt;
  
    &lt;div class="field"&gt;
      &lt;%= f.label :school %&gt;&lt;br /&gt;
      &lt;%= f.text_field :name %&gt;
    &lt;/div&gt;
    &lt;%= f.fields_for :admin do |f2| %&gt;
      &lt;div class="field"&gt;
        &lt;%= f2.label "administrator name" %&gt;&lt;br /&gt;
        &lt;%= f2.text_field :name %&gt;
      &lt;/div&gt;
      &lt;div class="field"&gt;
        &lt;%= f2.label "administrator email" %&gt;&lt;br /&gt;
        &lt;%= f2.text_field :email %&gt;
      &lt;/div&gt;
      &lt;div class="field"&gt;
        &lt;%= f2.label "administrator gender" %&gt;&lt;br /&gt;
        &lt;%= f2.text_field :gender %&gt;
      &lt;/div&gt;
    &lt;% end %&gt;
    &lt;div class="actions"&gt;
      &lt;%= f.submit %&gt;
    &lt;/div&gt;
  &lt;% end %&gt;
  </code></pre>