Rails model validation on create and update only

Question

If I want to have validation only on create, then I can do

validates_presence_of :password, :on => :create

But how do I say on create and update? I tried this but it didn't work:

validates_presence_of :password, :on => [ :create, :update ]

Do I have to define the validation two times?

Could be a patch in the making... except how is :create and :update different from the default :save? (Wouldn't :save be both?) — Jon Smock, Sep 08 '09 at 12:44

score 66 · Accepted Answer · edited Feb 10 '12 at 13:07

66

By default, the validations run for both create and update. So it should be just:

validates_presence_of :password

The :on key just allows you to choose one of them.

edited Feb 10 '12 at 13:07

bjnord

answered Sep 08 '09 at 12:26

20

the new convention is actually to use: `validates :password, presence: true` – Sébastien Grosjean - ZenCocoon Aug 08 '12 at 11:20

score 12 · Answer 2 · edited Nov 09 '11 at 18:02

12

Only write:

validates_presence_of :password

No need...

on => :create

edited Nov 09 '11 at 18:02

Jason Plank

answered Oct 15 '09 at 17:53

FJ.

score 0 · Answer 3 · answered Jun 01 '17 at 21:22

0

You can use this when you need to disable the validation on some specific operations, such as delete.

answered Jun 01 '17 at 21:22

Ederson Badeca

3 Answers3