I'm stuck in the first step... - Add "cannot be blank" validation to
the three fields...

Model validations aren't working at all... i've tried
"validates_presence_of", "validate_on_create"... Aren't these methods
called when I create a new instance of the User object?

the 'respond' action (controllers/hello_controller.rb) does this:

def respond
  @user = User.new(params[:user]) # <= This must create a new instance
of the "User" object.
  ...
end

and the User (models/user.rb) is:

class User < ActiveRecord::Base
  # Nothing works here! "validates_presence_of" or "def
validate_on_create"... nothing!
end

----------

Any clues?

Thanks in advance,
Gabriel.
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