Antun’s Blog

If you’re going to upload files via an HTML form, the form’s encoding must be set to multipart/form-data. In Rails, you use a helper method to generate the form tags, so you can’t directly edit them. The preferred helper is form_for; that’s what scaffold generates.

Normally, a form_for call would look like this:

<% form_for(@entry) do |f| %>
  <!-- Form fields -->
<% end %>

To make this form be multipart, change the call to the following:

<% form_for(@entry, :html => {:multipart => true}) do |f| %>
  <!-- Form fields -->
<% end %>