<%= form_for @model_name, :url => {:controller => 'controller_name', :action => 'index'},:html => {:multipart => true},:validate => true do |f| %>

<%= file_field 'upload', 'datafile'%>

<% end %>

I have this form. I want to upload only images through this upload. How to do this?

ruby-on-rails ruby forms
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