I understand the value of teaching functions here, but I just started using Netbeans and its fantastic auto-completion feature.. It turns out that validates_numericality_of has a :greater_than condition (and all associated conditions of course). I think this may be worth mentioning, no?
[edit : eep! I could have sworn I was in “Agile Web Development with Rails!” Can this post be moved or should I recreate it in the proper forum?]