On Thursday, 17 of September 2009 16:24:26 Peter Rabbitson wrote: > Eden Cardim wrote: > > On Thu, Sep 17, 2009 at 9:40 AM, Paweł Pabian <[email protected]> wrote: > >> Hi > >> > >> I have some users > >> > >> package Schema::User; > >> __PACKAGE__->table('users'); > >> __PACKAGE__->add_columns('id', 'login'); > >> __PACKAGE__->set_primary_key('id'); > >> __PACKAGE__->has_many('attributes' => 'Schema::Attribute', 'users_id'); > >> > >> and they have many attributes > >> > >> package Schema::Atrribute; > >> __PACKAGE__->table('attributes'); > >> __PACKAGE__->add_columns('users_id', 'name', 'value'); > >> __PACKAGE__->set_primary_key('users_id', 'name'); > >> __PACKAGE__->belongs_to('user' => 'Schema::User', 'users_id'); > >> > >> Now i want to find Users that don't have Attribute of given name. > >> In raw SQL it needs name condition to be placed in LEFT JOIN: > >> > >> SELECT * > >> FROM users AS u > >> LEFT JOIN attributes AS a > >> ON u.id=a.users_id > >> AND a.name="car" > >> WHERE a.users_id IS NULL > >> > >> How to force DBIx::Class to add this > >> ---- > >> AND a.name="car" > >> ---- > >> part to join condition? > > > > DBIC doesn't support variable join conditions, but you can add the AND > > a.name = 'car' condition to your where clause to the same effect. > > He can not. A left with right-side condition join is not the same as > left join + where condition.
Indeed. In this case it will make impossible condition. > The only way to do this currently is with a virtual view: > http://search.cpan.org/~ribasushi/DBIx-Class-0.08111/lib/DBIx/Class/ResultS >ource/View.pm Thanks for linking this View module. It makes things complicated (for performance reasons i won't explain here) but possible. _______________________________________________ List: http://lists.scsys.co.uk/cgi-bin/mailman/listinfo/dbix-class IRC: irc.perl.org#dbix-class SVN: http://dev.catalyst.perl.org/repos/bast/DBIx-Class/ Searchable Archive: http://www.grokbase.com/group/[email protected]
