PostgreSQL primary (sequence) key issue (Ruby/Rails)

Hi Guys,
I'm completely stumped with this one!

I've included ActiveRecord::Base.set_sequence_name in my environment.rb, and
in my user.rb I've placed the following code:

class Usertbl < ActiveRecord::Base
set_primary_key "user_id"
set_sequence_name "seq_user_mytable"
validates_uniqueness_of :userpassword, :username, :scope => :user_id
end

From http://localhost:3000/usertbl/new I then attempt to enter a new a
record and receive the following error message:

RuntimeError: ERROR C23502 Mnull value in column "user_id" violates
not-null constraint

FexecMain.c L1795 RExecConstraints: INSERT INTO usertbl

Oh my head hurts!!

--
Regards

Andrew

On 01/03/07, Andrew Madu < andrewmadu(at)gmail(dot)com> wrote:
>
> Hi Dave,
> my apologies for contacting you off list but i'm having a spot of bother
> with postgreSQL sequence setup in rails. In addition to what is mentioned
> below, I have place the following line of code in my environment.rbdocument:
>
> # Include your application configuration below
> ActiveRecord::Base.pluralize_table_names = false
> ActiveRecord::Base.set_sequence_name
>
> What I am overlooking here?
>
> --
> Regards
>
> Andrew
>
> ---------- Forwarded message ----------
> From: Andrew Madu < andrewmadu(at)gmail(dot)com>
> Date: 01-Mar-2007 15:28
> Subject: Re: PostgreSQL primary (sequence) key issue
> To: rubyonrails-talk(at)googlegroups(dot)com
>
> Hi,
> I've followed the example given here:
>
> http://ar.rubyonrails.com/classes/ActiveRecord/Base.html#M000367
>
> and implemented set_sequence_name "seq_name" in my class. When I try to
> update the user table with a new row from:
>
> http://localhost:3000/usertbl/new
>
> I get the following error message:
>
> RuntimeError: ERROR C23502 Mnull value in column "user_id" violates not-null constraint
>
>
> FexecMain.c L1795 RExecConstraints: INSERT INTO usertbl
>
>
> What am I overlooking here?
>
> Also coud possibly give me any clues on how to setup an 'assigned' primary
> key in an ActiveRecord class?
>
> --
> Regards
>
> Andrew
>
> On 01/03/07, Andrew Madu <andrewmadu(at)gmail(dot)com> wrote:
> >
> > Hi,
> > I have a sequence set up on one of my tables called seq_user_mytable. I
> > tried the following with no joy:
> >
> > set_primary_key "user_id", :sequence => "seq_user_mytable" and:
> >
> > ActiveRecord:: Base.seq_user_mytable
> >
> > again with no joy. How do I implement a sequence in Rails/ActiveRecord?
> >
> > --
> > Regards
> >
> > Andrew
> >
>
>