app/views/job_applications/cover_letters/_form.html.erb
<%= form_for @cover_letter, url: job_application_cover_letter_path do |f| %>
<%= error_messages_for @cover_letter %>
<div class="field">
<%= f.label :sent_date %><br>
<%= f.date_field :sent_date %>
</div>
<div class="field">
<%= f.label :content %><br>
<%= f.text_area :content, :size => '80x30', :class => 'md_edit' %>
</div>
<div class="actions">
<%= f.submit %>
</div>
<% end %>