# Condition in validation **URL:** \ **Category:** Rails\ **Created:** [August 17, 2009, 7:22pm UTC](https://www.ruby-forum.com/t/condition-in-validation/173888 "2009-08-17T19:22:17Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![paulbutcher](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/a5b964/32.png) [@paulbutcher](https://www.ruby-forum.com/u/paulbutcher)\ **Post date:** [August 17, 2009, 7:22pm UTC](https://www.ruby-forum.com/t/condition-in-validation/173888/1 "2009-08-17T19:22:17Z")
Is this right? validates\_uniqueness\_of :email, :message =\> “Email taken”, :unless =\> :email == ‘removed\_email\_address@domain.invalid’ ---
**Author:** ![paulbutcher](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/a5b964/32.png) [@paulbutcher](https://www.ruby-forum.com/u/paulbutcher)\ **Post date:** [August 17, 2009, 7:30pm UTC](https://www.ruby-forum.com/t/condition-in-validation/173888/2 "2009-08-17T19:30:42Z")
On Aug 17, 6:22 pm, Pål Bergström [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > Is this right? > > validates\_uniqueness\_of :email, :message =\> “Email taken”, :unless =\> > :email == ‘removed\_email\_address@domain.invalid’ no. :unless must be the name of a method that returns whether or not to run the validation Fred ---
**Author:** ![paulbutcher](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/a5b964/32.png) [@paulbutcher](https://www.ruby-forum.com/u/paulbutcher)\ **Post date:** [August 17, 2009, 7:33pm UTC](https://www.ruby-forum.com/t/condition-in-validation/173888/3 "2009-08-17T19:33:13Z")
Frederick C. wrote: > On Aug 17, 6:22�pm, P�l Bergstr�m [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) > wrote: > > > Is this right? > > > > validates\_uniqueness\_of :email, :message =\> “Email taken”, :unless =\> > > :email == ‘removed\_email\_address@domain.invalid’ > > no. :unless must be the name of a method that returns whether or not > to run the validation > > Fred How would I write a condition that doesn’t check the uniqueness of a mail address if the address is ‘removed\_email\_address@domain.invalid’ ---
**Author:** ![paulbutcher](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/a5b964/32.png) [@paulbutcher](https://www.ruby-forum.com/u/paulbutcher)\ **Post date:** [August 17, 2009, 7:38pm UTC](https://www.ruby-forum.com/t/condition-in-validation/173888/4 "2009-08-17T19:38:54Z")
On Aug 17, 6:33 pm, Pål Bergström [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) wrote: > > Fred > > How would I write a condition that doesn’t check the uniqueness of a > mail address if the address is ‘removed\_email\_address@domain.invalid’ you write a method that returns true if the email is that magic value Fred ---
**Author:** ![paulbutcher](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/a5b964/32.png) [@paulbutcher](https://www.ruby-forum.com/u/paulbutcher)\ **Post date:** [August 17, 2009, 9:49pm UTC](https://www.ruby-forum.com/t/condition-in-validation/173888/5 "2009-08-17T21:49:26Z")
validates\_uniqueness\_of :email, :message =\> “Email taken”, :unless =\> “email == ‘removed\_email\_address@domain.invalid’” ---
**Author:** ![paulbutcher](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/a5b964/32.png) [@paulbutcher](https://www.ruby-forum.com/u/paulbutcher)\ **Post date:** [August 17, 2009, 7:41pm UTC](https://www.ruby-forum.com/t/condition-in-validation/173888/6 "2009-08-17T19:41:33Z")
Frederick C. wrote: > On Aug 17, 6:33�pm, P�l Bergstr�m [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) > wrote: > > > > Fred > > > > How would I write a condition that doesn’t check the uniqueness of a > > mail address if the address is ‘removed\_email\_address@domain.invalid’ > > you write a method that returns true if the email is that magic value > > Fred I see. Now I understand. 🙂 Thanks. ---
**Author:** ![paulbutcher](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/a5b964/32.png) [@paulbutcher](https://www.ruby-forum.com/u/paulbutcher)\ **Post date:** [August 17, 2009, 10:27pm UTC](https://www.ruby-forum.com/t/condition-in-validation/173888/7 "2009-08-17T22:27:56Z")
Samer A. wrote: > validates\_uniqueness\_of :email, :message =\> “Email taken”, :unless =\> > “email == ‘removed\_email\_address@domain.invalid’” Nope. ## Best, Marnen Laibow-Koser [http://www.marnen.org](http://www.marnen.org) removed\_email\_address@domain.invalid ---
**Author:** ![paulbutcher](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/a5b964/32.png) [@paulbutcher](https://www.ruby-forum.com/u/paulbutcher)\ **Post date:** [August 18, 2009, 5:31pm UTC](https://www.ruby-forum.com/t/condition-in-validation/173888/8 "2009-08-18T17:31:57Z")
Unless I am severely mistaken, you can’t use :unless as a condition in the validation anyway. It would need to be :if =\> some\_condition, where the some\_condition method would return true/false. On Aug 17, 1:22 pm, Pål Bergström [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) ---
**Author:** ![paulbutcher](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/p/a5b964/32.png) [@paulbutcher](https://www.ruby-forum.com/u/paulbutcher)\ **Post date:** [August 18, 2009, 5:50pm UTC](https://www.ruby-forum.com/t/condition-in-validation/173888/9 "2009-08-18T17:50:34Z")
Billee D. wrote: > Unless I am severely mistaken, you can’t use :unless as a condition in > the validation anyway. It would need to be :if =\> some\_condition, > where the some\_condition method would return true/false. > > On Aug 17, 1:22�pm, P�l Bergstr�m [removed\_email\_address@domain.invalid](mailto:removed_email_address@domain.invalid) It worked with :unless, as described in the API.