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]
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