Understanding Rails validation: what does allow_blank do?

Question

I\'m quite new to Rails and found a little snippet to validate presence and uniqueness step by step: first check presence, then check uniqueness.

validates :         


        

Answer 1

:allow_blank is an option that will "disable" several of the validators, but not the presence validator. The result of using these two together is that when the field is left blank, you will get the :blank error message (i.e., "can't be blank"), but not the other error messages.