ruby on rails - How to limit only images to be uploaded through file_field tag? - 


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

i have form. want upload images through upload. how this?

you can use paperclip gem manage file attachments. has validates_attachment validator helpful.

validates_attachment :avatar, :presence => true,   :content_type => { :content_type => "image/jpg" },   :size => { :in => 0..10.kilobytes }

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