validate_presence_of problem

Hi
In my application i want to validate the fields of perticular views.
in my application:
controller name: streams_controller
model name: stream
and i want to validates a text field in the view "new.html.erb".here
tis field take a file to be uploaded

i have a text field called :location in new.html.erb view
to validate this field i have wriiten code in model like:

class Stream < ActiveRecord::Base
validates_presence_of :location
.....
...
...
end

i did not see any validation.
Can any one help where i am doing hte mistake.

thanks
Srikanth

Hi, please take a look at look at the following:

validates_presence_of

Good luck,

-Conrad