--- /dev/null
+use strict;
+use warnings;
+use Test::More;
+
+use lib qw(t/lib);
+use DBICTest;
+use DBIC::SqlMakerTest;
+
+#plan tests => 6;
+plan 'no_plan';
+
+my $schema = DBICTest->init_schema();
+
+my $cd_rs = $schema->resultset('CD')->search (
+ { 'tracks.cd' => { '!=', undef } },
+ { prefetch => 'tracks' },
+);
+
+# Database sanity check
+is($cd_rs->count, 5, 'CDs with tracks count');
+for ($cd_rs->all) {
+ is ($_->tracks->count, 3, '3 tracks for CD' . $_->id );
+}
+
+# Test a belongs_to prefetch of a has_many
+{
+ my $track_rs = $schema->resultset ('Track')->search (
+ { 'me.cd' => { -in => [ $cd_rs->get_column ('cdid')->all ] } },
+ {
+ # the select/as is deliberately silly to test both funcs and refs below
+ select => [
+ 'me.cd',
+ \ 'COUNT (me.trackid) AS track_count',
+ { count => 'me.trackid' },
+ ],
+ as => [qw/
+ cd
+ track_count
+ track_count_2
+ /],
+ group_by => [qw/me.cd/],
+ prefetch => 'cd',
+ },
+ );
+
+ is($track_rs->count, 5, 'Prefetched count with groupby');
+ is($track_rs->all, 5, 'Prefetched objects with groupby');
+
+ {
+ my $query_cnt = 0;
+ $schema->storage->debugcb ( sub { $query_cnt++ } );
+
+ $track_rs->reset;
+ while (my $collapsed_track = $track_rs->next) {
+
+ my $cdid = $collapsed_track->get_column('cd');
+ is($collapsed_track->get_column('track_count'), 3, "Correct count of tracks for CD $cdid" );
+ ok($collapsed_track->cd->title, "Prefetched title for CD $cdid" );
+ }
+
+ is ($query_cnt, 0, 'No queries on prefetched titles');
+ $schema->storage->debugcb (undef);
+ }
+
+ # Test sql by hand, as the sqlite db will simply paper over
+ # improper group/select combinations
+ #
+ # the exploded IN needs fixing below, coming in another branch
+ #
+ is_same_sql_bind (
+ $track_rs->count_rs->as_query,
+ '(
+ SELECT COUNT( * )
+ FROM (
+ SELECT me.cd
+ FROM track me
+ JOIN cd cd ON cd.cdid = me.cd
+ WHERE ( me.cd IN ( ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ? ) )
+ GROUP BY me.cd
+ )
+ count_subq
+ )',
+ [ map { [ 'me.cd' => $_] } ($cd_rs->get_column ('cdid')->all) ],
+ 'count() query generated expected SQL',
+ );
+
+ # the double-count is deliberate
+ is_same_sql_bind (
+ $track_rs->as_query,
+ '(
+ SELECT me.cd, me.track_count, me.track_count_2, cd.cdid, cd.artist, cd.title, cd.year, cd.genreid, cd.single_track
+ FROM (
+ SELECT me.cd, COUNT (me.trackid) AS track_count, COUNT (me.trackid) AS track_count_2
+ FROM track me
+ WHERE ( cd IN ( ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ? ) )
+ GROUP BY me.cd
+ ) as me
+ JOIN cd cd ON cd.cdid = me.cd
+ WHERE ( me.cd IN ( ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ? ) )
+ )',
+ [ map { [ 'me.cd' => $_] } ($cd_rs->get_column ('cdid')->all) ],
+ 'next() query generated expected SQL',
+ );
+
+
+ # add an extra track to one of the cds, and then make sure we can get it on top
+ # (check if limit works)
+ my $top_cd = $cd_rs->slice (1,1)->next;
+ $top_cd->create_related ('tracks', {
+ title => 'over the top',
+ });
+
+ my $top_cd_collapsed_track = $track_rs->search ({}, {
+ rows => 2,
+ order_by => [
+ { -desc => 'track_count' },
+ ],
+ });
+
+ is ($top_cd_collapsed_track->count, 2);
+
+ is (
+ $top_cd->title,
+ $top_cd_collapsed_track->first->cd->title,
+ 'Correct collapsed track with prefetched CD returned on top'
+ );
+}
+
+# test a has_many/might_have prefetch at the same level
+# double-count for now, until we figure out how to do this cleanly
+# with a function
+# Note that one of the CDs now has 4 tracks instead of 3
+{
+ my $most_tracks_rs = $cd_rs->search ({}, {
+ prefetch => 'liner_notes', # tracks are alredy prefetched
+ select => ['me.cdid', { count => 'tracks.trackid' } ],
+ as => [qw/cdid track_count/],
+ group_by => 'me.cdid',
+ order_by => { -desc => \ 'COUNT (tracks.trackid)' },
+ rows => 2,
+ });
+
+ is_same_sql_bind (
+ $most_tracks_rs->count_rs->as_query,
+ '(
+ SELECT COUNT( * )
+ FROM (
+ SELECT me.cdid
+ FROM cd me
+ LEFT JOIN track tracks ON tracks.cd = me.cdid
+ LEFT JOIN liner_notes liner_notes ON liner_notes.liner_id = me.cdid
+ WHERE ( tracks.cd IS NOT NULL )
+ GROUP BY me.cdid
+ LIMIT 2
+ ) count_subq
+ )',
+ [],
+ 'count() query generated expected SQL',
+ );
+
+ is_same_sql_bind (
+ $most_tracks_rs->as_query,
+ '(
+ SELECT me.cdid, COUNT( tracks.trackid ), tracks.trackid, tracks.cd, tracks.position, tracks.title, tracks.last_updated_on, tracks.last_updated_at, liner_notes.liner_id, liner_notes.notes
+ FROM (
+ SELECT me.cdid, COUNT( tracks.trackid )
+ FROM cd me
+ LEFT JOIN track tracks ON tracks.cd = me.cdid
+ WHERE ( tracks.cd IS NOT NULL )
+ GROUP BY me.cdid
+ ORDER BY COUNT (tracks.trackid) DESC,
+ LIMIT 2
+ ) me
+ LEFT JOIN track tracks ON tracks.cd = me.cdid
+ LEFT JOIN liner_notes liner_notes ON liner_notes.liner_id = me.cdid
+ WHERE ( tracks.cd IS NOT NULL )
+ ORDER BY COUNT (tracks.trackid) DESC, tracks.cd
+ )',
+ [],
+ 'next() query generated expected SQL',
+ );
+
+ is ($most_tracks_rs->count, 2, 'Limit works');
+ my $top_cd = $most_tracks_rs->first;
+ is ($top_cd->id, 2, 'Correct cd fetched on top'); # 2 because of the slice(1,1) above
+
+ my $query_cnt = 0;
+ $schema->storage->debugcb ( sub { $query_cnt++ } );
+
+ is ($top_cd->get_column ('track_count'), 4, 'Track count fetched correctly');
+ is ($top_cd->tracks->count, 4, 'Count of prefetched tracks rs still correct');
+ is ($top_cd->tracks->all, 4, 'Number of prefetched track objects still correct');
+ is (
+ $top_cd->liner_notes->notes,
+ 'Buy Whiskey!',
+ 'Correct liner pre-fetched with top cd',
+ );
+
+ is ($query_cnt, 0, 'No queries executed during prefetched data access');
+ $schema->storage->debugcb (undef);
+}
projects / dbsrgits/DBIx-Class.git / commitdiff