Rails greater_than model validation against model attribute

Question

I\'ve got a Trip model, which among other attributes has a start_odometer and end_odometer value. In my model, i\'d like to validate that the end odometer is larger than the st

Answer 1

It's a bit kludgy, but this seems to work:

validates_numericality_of :end_odometer, :greater_than => :start_odometer.to_i, :allow_blank => true