Rails, uploading a file using only file_field -


i need upload file in rails without gems, decided use

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

without form , etc. file_field , in controller tried catch 

name =  params[:upload][:datafile].original_filename

it shows me error:

undefined method `original_filename' "me.jpg":string

my params:

"upload"=>{"datafile"=>"me.jpg"}

it seems cannot use file_field alone without form, can i? or should alway include form? if yes, possible without using form?

please verify have added multipart: true option in form_tag or not.

syntax:-

<%= form_tag '/upload', multipart: true %>  <label for="file">file upload</label> <%= file_field_tag "file" %>  <%= submit_tag %> <% end %>

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