Consider the api definition for form_tag:
form_tag( url_for_options = {}, options = {}, *parameters_for_url, &proc)
This form_tag:
<%= form_tag( :action => 'upload', :multipart => true ) %>
Produces this:
<form action="/home/upload?multipart=true" method="post">
which is probably not what you want.
Try this instead:
<%= form_tag( { :action => 'upload' }, :multipart => true ) %>
and you’ll get this:
<form action="/home/upload" enctype="multipart/form-data" method="post">
You have to establish when your first hash of parameters ends, otherwise form_tag will assume your :action and your :multipart option are a single hash, when :multipart really needs to go in the second hash.
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