model Validation for Polymorphic association

[Selvaraj]

Hi All,

 I got one problem... Initially looks simple but not getting solved..

Anybody did the model validation for polymorphic association table??

class Request < ActiveRecord::Base

  belongs_to :user
  belongs_to :user_request,:polymorphic=>true
  belongs_to :service
end

class WaterBill < ActiveRecord::Base
  has_one :request,:as=>:user_request,:dependent=>:destroy


  validates_presence_of(:name_of_legalperson, :message => "Should not be
blank")

end


   Here validation in WaterBill model is not working..

my controller code...

def save

    @requests=Request.new()
    @requests.user_request=WaterBill.new(params[:water_bill])
    if @requests.save
      flash[:notice] = 'Water Bill Was Successfully Created.'
      redirect_to :action => 'newwaterbill'

    else
      render :action => 'newwaterbill'
    end
  end


  Any thing wrong in this code .. please clarify my doubts...

 
Regards
Selva