In rails, how to obtain the size and type of a file when using "file_field" to upload a file

Question

When I using "file_field" to upload a file:

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

The file name can be obtained in the controller:

params[:upload]['datafile'].original_filename

but how can I obtain the size and type of the file?

Answer 1

Use the content_type and size helper functions

params[:upload]['datafile'].content_type

Not sure why you'd want to do that in a controller, but any validation needs to be moved inside your model. Also try using a plugin like Paperclip or SWFUpload to handle uploads, for greater flexibility.

Try these links for a examples Paperclip, Attachment_fu, SWFUpload