Formtastic semantic_form_for undefined method

Question

I am trying to set up a form using Formtastic which has a drop down. My Ruby app works fine with the following form:

<%= form_for @message do |f| %>
  <%= f.error_messages %>
  <%= f.hidden_field :parent_id %>
  <p>
    <%= f.label :content, "Add a Country to your carrier" %><br />
    <%= f.text_area :content, :rows => 8 %>
  </p>
  <p><%= link_to "Reply", new_message_path(:parent_id => @london_message) %></p>
<% end %>

When I change form_for to semantic_form_for it is throwing an 'undefined method' error. Can anyone explain the different between these two methods and why semantic_form_for is not working?

Answer 1

form_for and semantic_form_for are two separate form builders. They have a lot of similarities, but the Formtastic version allows you to use a lot of shorthand methods to avoid repeating a lot of boilerplate.

If semantic_form_for is throwing 'undefined method', it sounds like Formtastic is not being loaded correctly. If you go into the Rails console and type Formtastic , it should return "Formtastic". If you get "Uninitialized Constant" instead, then the problem is definitely somewhere in the gem loading process.