Rails - Jan 2006 - if condition on validates_presence_of is not working

class Event < ActiveRecord::Base
  attr_accessor :step_processing

  validates_presence_of :name,:description , :if =>  (:step_processing =4)
end

class TestController < ApplicationController

def bar
  @event = Event.new
  @event.step_processing = 4
  @event.name = ''foo''
  @event.save
end

end

In the above code :step_processing a non-database field. It''s just
there to
control the processing. The validation should take place only when the
step_processing is ''4'' but in reality it''s done every
single time. I guess I
am goofing up the syntax or something like that.

Thanks.
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