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Rails form_for() :multipart

In Ruby on Rails you can set :multipart => true on form_tag() and it will return a form tag with the proper enctype for uploading files. However, you can't use :multipart directly on form_for().

The work around is to set enctype directly to the :html of the fom_for():

form_for(@post, :html => {:enctype => "multipart/form-data"})

Which will return something like:

 <form action="/posts" enctype="multipart/form-data" method="post">[...]