i think this ? http://search.cpan.org/~frew/DBIx-Class-0.08124/lib/DBIx/Class/ResultSource.pm#relationships
On Fri, Dec 17, 2010 at 5:23 PM, Bill Moseley <[email protected]> wrote: > To be a bit more succinct: > > Is there a method to see if a given $rs will join to (or query from) table > "foo" and if so what alias is used? > > I guess I could use $rs->as_query and a regular expression but wondered if > there might be a way that doesn't need to build the entire query. > > > > On Thu, Dec 16, 2010 at 4:59 PM, Bill Moseley <[email protected]> wrote: > >> >> Music Database: label -> cd -> track -> movement -> note >> >> So, there's a hierarchy of objects. >> >> Say, label has a "deleted" flag that always needs to be checked. So, one >> option is to join and then add the check constraint in the base class: >> >> $rs = $schema->resultset( 'Track' )->join_label->check_deleted; >> $rs = $schema->resultset( 'Cd' )->join_label->check_deleted; >> $rs = $schema->resultset( 'Note' )->join_label->check_deleted; >> >> >> Where join_label() is a method in the specific resultset class -- e.g. >> ResultSet::CD has method join_label { return shift->search( undef, { join => >> 'label' } ) }, and likewise, ResultSet::Note has a join_label method that >> joins from note all the way to label. >> >> And then in the base ResultSet class check_deleted adds this to the >> resultset: sub check_deleted { return shift->search( { 'label.deleted' => 0 >> } ); } >> >> That works because every object is joined to the label object. >> >> >> Now, assume there's also a "deleted" flag on the track object. If >> fetching a CD or Label then don't want to add a track.deleted => 0 >> condition, but if fetching track, movement, or a note I do want to add that >> condition. >> >> Is it possible to "know" in the base "check_deleted' method that the $rs >> is fetching either a track (or is joined to track) and then conditionally >> add the track.deleted check? >> >> >> -- >> Bill Moseley >> [email protected] >> > > > > -- > Bill Moseley > [email protected] > > _______________________________________________ > 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] >
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