Use the `unless` key instead of `if` on the validation. This will perform the validation unless the column is null, i.e., will perform validation if the column is not null.
http://guides.rubyonrails.org/active_record_validations.html#conditional-validation -Jason On Mar 29, 2017 8:35 AM, "fugee ohu" <[email protected]> wrote: Trying to validate presence where another field is not null I found this example, the opposite class Person < ApplicationRecord validates :surname, presence: true, if: "name.nil?" end How do I change the if: condition to name not nil? -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/ msgid/rubyonrails-talk/7af99734-ca1f-41d0-9252-7deaad800783%40googlegroups. com <https://groups.google.com/d/msgid/rubyonrails-talk/7af99734-ca1f-41d0-9252-7deaad800783%40googlegroups.com?utm_medium=email&utm_source=footer> . For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "Ruby on Rails: Talk" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/rubyonrails-talk/CAMwrwpFjft0g7ux%3DW39uNk1Zd1B%2BOSo_FqphgYf%3DtKJ_f70k2w%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
