Rails - Jan 2006 - validates_uniqueness_of :username, :if => !self.new_record?

Hi all

I want users to register on my page. To register, they only have to 
deliver an email and a password. Then a link with an activation token 
will be sent to them, and after clicking the link the user sees a page 
where he should fill in further details, means: a username.

My model looks like this:

class Member < ActiveRecord::Base
  validates_presence_of :username, :if => !self.new_record?
end

Sadly this does not work: it tells me "undefined method
`new_record?''
for Member:Class".

Where''s the problem? Shouldn''t any ActiveRecord class have a
method
called ''new_record?''?

Thanks for help.
Josh

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Posted via http://www.ruby-forum.com/.

I think you should probably use the :on option here:

validates_presence_of :username, :on => :update

This will only perform the validation if the record has already been 
saved. Or, you can do this (not recommended):

validates_presence_of :username, :if => Proc.new { |member| 
!member.new_record? }

The reason you can''t do it the way you tried is because self in that 
context is referring to the Member class, not to any particular 
instance.

Cheers, Jonny.

Joshua Muheim wrote:
> Hi all
> 
> I want users to register on my page. To register, they only have to 
> deliver an email and a password. Then a link with an activation token 
> will be sent to them, and after clicking the link the user sees a page 
> where he should fill in further details, means: a username.
> 
> My model looks like this:
> 
> class Member < ActiveRecord::Base
>   validates_presence_of :username, :if => !self.new_record?
> end
> 
> Sadly this does not work: it tells me "undefined method
`new_record?''
> for Member:Class".
> 
> Where''s the problem? Shouldn''t any ActiveRecord class
have a method
> called ''new_record?''?
> 
> Thanks for help.
> Josh

-- 
Posted via http://www.ruby-forum.com/.

Hi !

2006/1/23, Joshua Muheim <forum@josh.ch>:
> class Member < ActiveRecord::Base
>   validates_presence_of :username, :if => !self.new_record?
> end
If you look at the documentation, you''ll see you need to pass a Proc
instance:

validates_presence_of :username, :if => Proc.new { |record|
!record.new_record? }

Alternatively, I believe you should be able to do this too:

validates_presence_of :username, :on => :update

That last part I haven''t tested.

Hope that helps !
--
Fran?ois Beausoleil
http://blog.teksol.info/

Thanks a lot. What possible values does :on have?

-- 
Posted via http://www.ruby-forum.com/.

2006/1/23, Joshua Muheim <forum@josh.ch>:
> Thanks a lot. What possible values does :on have?
:save (Always)
:create (new_record? == true)
:update (new_record? == false)

:destroy ?
:delete ?

Not sure about those two.  Check the documentation at http://api.rubyonrails.com

Bye !
--
Fran?ois Beausoleil
http://blog.teksol.info/

Thanks a lot.

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Posted via http://www.ruby-forum.com/.