Validation limit values

Hi,

Is there a way to set the validate_numericality_of limit to a variable
passed in from the controller? I have this model:

class Vision < ActiveRecord::Base

belongs_to :employee
belongs_to :users

validates_numericality_of :paid_amount, :on
=> :update, :less_than_or_equal_to => 250, :allow_nil => true
validates_numericality_of :cost, :allow_nil => false

end

I’d like to use something like: :less_than_or_equal_to=> :variable

Thanks.

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