Add error message handling

form_for

# Put this in the form_for loop after "do"
<%= render 'shared/errors', object: @object_name %>

# Then in the shared/errors partial put:
<% if object.errors.any? %>
<section id="errors">
  <header>
    <h2>
      Oops! The <%= object.titleize.downcase %> could not be saved. 
    </h2>
    <h3>
      Please correct the following <%= pluralize(object, "error") %>:
    </h3>
  </header>
  <ul>
    <% object.errors.full_messages.each do |message| %>
      <li><%= message %></li>
    <% end %>
  </ul>
</section>
<% end %>