Rails - Nov 2005 - Get content_type of uploaded file when using file-column

I use the file-column plugin to handle a file upload module for a rails 
app. Plain and simple:

class Media < ActiveRecord::Base
  file_column :file

What I now would like is to get the contetn_type or the IOString object 
of the original uploaded file. file_column converts this to a string 
object containing the path to the file.

Any idears?

-- 
Posted via http://www.ruby-forum.com/.

You can''t determine that from the extension of the uploaded file? 
What exactly are you trying to do?

You can try to override the file= method

alias_method :old_file=, :filedef file=(original_io)
  #do something with original io
  old_file=(original_io)
end

On 11/30/05, Mattias Bodlund
<mattias-85ePeH3V+ZFknbxzx/v8hQ@public.gmane.org>
wrote:
> I use the file-column plugin to handle a file upload module for a rails
> app. Plain and simple:
>
> class Media < ActiveRecord::Base
>   file_column :file
>
> What I now would like is to get the contetn_type or the IOString object
> of the original uploaded file. file_column converts this to a string
> object containing the path to the file.
>
> Any idears?
>
> --
> Posted via http://www.ruby-forum.com/.
> _______________________________________________
> Rails mailing list
> Rails-1W37MKcQCpIf0INCOvqR/iCwEArCW2h5@public.gmane.org
> http://lists.rubyonrails.org/mailman/listinfo/rails
>

kyle wrote:
> You can''t determine that from the extension of the uploaded file?
> What exactly are you trying to do?
> 
> You can try to override the file= method
> 
> alias_method :old_file=, :file> def file=(original_io)
>   #do something with original io
>   old_file=(original_io)
> end
I can''t make this work. File-column trabnsform the IO object to a
String
object (the files location) This happens before I can get my hands on 
the IOString object.

I could moove this to the controller but that feels like the wrong place 
for this.

-- 
Posted via http://www.ruby-forum.com/.

On 11/30/05, Mattias Bodlund <mattias@oncotype.dk>
wrote:
>
> kyle wrote:
> > You can't determine that from the extension of the uploaded file?
> > What exactly are you trying to do?
> >
> > You can try to override the file= method
> >
> > alias_method :old_file=, :file> > def file=(original_io)
> >   #do something with original io
> >   old_file=(original_io)
> > end
>
> I can't make this work. File-column trabnsform the IO object to a
String
> object (the files location) This happens before I can get my hands on
> the IOString object.
>
> I could moove this to the controller but that feels like the wrong place
> for this.


I feel the same but now I couldn't get the mime type from the model
declaration (ideally in a before_create hook). Then I wrote in some
controller:
def save
  media = Media.new(params[:media])
  # ...
  media.content_type  = params[:media][:file].content_type.strip
  media.save
end


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