[Dbix-class] Subquery question

[Brian Phillips]

I'm not sure how this translates to DBIx::Class, but in SQL (MySQL dialiect)
you could do this :

SELECT rol_id, display_name, sum(if(u.user_id = 2, 1, 0)) some_user
FROM app_role a LEFT JOIN user_role u USING(role_id)
HAVING some_user = 0

HTH

On 5/16/06, luke saunders <luke.saunders at gmail.com> wrote:
>
> On 5/16/06, Dan Horne <dan.horne at redbone.co.nz > wrote:
>
> > Hi All
> >
> > I'm trying to figure out how to perform subqueries with DBIx::Class. For
> >
> > example, I want to find all the roles that user 2 hasn't been assigned.
> > The standard SQL is
> >
> > select role_id, display_name
> > from   app_role a
> > where  not exists
> >     (select 1
> >      from   user_role u
> >      where  u.user_id = 2
> >      and    u.role_id = a.role_id);
> >
> > What would the DBIx::Class equivalent be?
> >
> > Regards
> >
> > Dan Horne
>
>
> Hi Dan,
>
> Sadly subselects like this aren't possible with DBIC at the moment.
>
> It's definitely on the TODO list, I guess Matt will be able to tell you
> roughly when it'll be ready. Until then you'll have to find a way of doing
> it that doesn't require the subselect.
>
> Cheers,
> Luke.
>
>
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