file_field_tag(name, options = {}) public

Creates a file upload field.

If you are using file uploads then you will also need to set the multipart option for the form: 

  <%= form_tag { :action => "post" }, { :multipart => true } %>
    <label for="file">File to Upload</label> <%= file_field_tag "file" %>
    <%= submit_tag %>
  <%= end_form_tag %>

The specified URL will then be passed a File object containing the selected file, or if the field was left blank, a StringIO object.

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August 9, 2011
1 thank

HTML5 support

To support multiple file selection simply pass :multiple => true in the options hash:

file_field_tag 'file', :accept => 'image/jpeg', :multiple => true
October 19, 2015
0 thanks

Multiple files

To use multiple file upload need to use variable_name[].

like this: 

file_field_tag 'files[]', :multiple => true

and in controller: 

if !params[ :files ].nil?
  params[ :files ].each{ |file|
     # do your staff
  }
end