unknown validator even though it is in the Rails Guide on validators and callbacks

Question

I am trying to validate that scores are greater than zero in my answer model when an answer is updated. Here is what i have so far.

validates :score, :greater_than => 0, :on => :update

However, i am getting this error:

Unknown validator: 'greater_than'

I found the greater_than validator here. Thanks for your help.

Answer 1

Try this:

validates :score, :numericality => {:greater_than => 0}, :on => :update