Broke up the prefetch tests into their own directory

[dbsrgits/DBIx-Class.git] / t / prefetch / multiple_hasmany.t

diff --git a/t/prefetch/multiple_hasmany.t b/t/prefetch/multiple_hasmany.t
new file mode 100644 (file)
index 0000000..6ef7a53
--- /dev/null
+++ b/t/prefetch/multiple_hasmany.t
@@ -0,0 +1,130 @@
+use strict;
+use warnings;  
+
+use Test::More;
+use Test::Exception;
+use lib qw(t/lib);
+use DBICTest;
+use Data::Dumper;
+
+my $schema = DBICTest->init_schema();
+
+my $orig_debug = $schema->storage->debug;
+
+use IO::File;
+
+BEGIN {
+    eval "use DBD::SQLite";
+    plan $@
+        ? ( skip_all => 'needs DBD::SQLite for testing' )
+        : ( tests => 16 );
+}
+
+# figure out if we've got a version of sqlite that is older than 3.2.6, in
+# which case COUNT(DISTINCT()) doesn't work
+my $is_broken_sqlite = 0;
+my ($sqlite_major_ver,$sqlite_minor_ver,$sqlite_patch_ver) =
+    split /\./, $schema->storage->dbh->get_info(18);
+if( $schema->storage->dbh->get_info(17) eq 'SQLite' &&
+    ( ($sqlite_major_ver < 3) ||
+      ($sqlite_major_ver == 3 && $sqlite_minor_ver < 2) ||
+      ($sqlite_major_ver == 3 && $sqlite_minor_ver == 2 && $sqlite_patch_ver < 6) ) ) {
+    $is_broken_sqlite = 1;
+}
+
+# once the following TODO is complete, remove the 2 warning tests immediately
+# after the TODO block
+# (the TODO block itself contains tests ensuring that the warns are removed)
+TODO: {
+    local $TODO = 'Prefetch of multiple has_many rels at the same level (currently warn to protect the clueless git)';
+
+    #( 1 -> M + M )
+    my $cd_rs = $schema->resultset('CD')->search ({ 'me.title' => 'Forkful of bees' });
+    my $pr_cd_rs = $cd_rs->search ({}, {
+        prefetch => [qw/tracks tags/],
+    });
+
+    my $tracks_rs = $cd_rs->first->tracks;
+    my $tracks_count = $tracks_rs->count;
+
+    my ($pr_tracks_rs, $pr_tracks_count);
+
+    my $queries = 0;
+    $schema->storage->debugcb(sub { $queries++ });
+    $schema->storage->debug(1);
+
+    my $o_mm_warn;
+    {
+        local $SIG{__WARN__} = sub { $o_mm_warn = shift };
+        $pr_tracks_rs = $pr_cd_rs->first->tracks;
+    };
+    $pr_tracks_count = $pr_tracks_rs->count;
+
+    ok(! $o_mm_warn, 'no warning on attempt to prefetch several same level has_many\'s (1 -> M + M)');
+
+    is($queries, 1, 'prefetch one->(has_many,has_many) ran exactly 1 query');
+    is($pr_tracks_count, $tracks_count, 'equal count of prefetched relations over several same level has_many\'s (1 -> M + M)');
+
+    for ($pr_tracks_rs, $tracks_rs) {
+        $_->result_class ('DBIx::Class::ResultClass::HashRefInflator');
+    }
+
+    is_deeply ([$pr_tracks_rs->all], [$tracks_rs->all], 'same structure returned with and without prefetch over several same level has_many\'s (1 -> M + M)');
+
+    #( M -> 1 -> M + M )
+    my $note_rs = $schema->resultset('LinerNotes')->search ({ notes => 'Buy Whiskey!' });
+    my $pr_note_rs = $note_rs->search ({}, {
+        prefetch => {
+            cd => [qw/tags tracks/]
+        },
+    });
+
+    my $tags_rs = $note_rs->first->cd->tags;
+    my $tags_count = $tags_rs->count;
+
+    my ($pr_tags_rs, $pr_tags_count);
+
+    $queries = 0;
+    $schema->storage->debugcb(sub { $queries++ });
+    $schema->storage->debug(1);
+
+    my $m_o_mm_warn;
+    {
+        local $SIG{__WARN__} = sub { $m_o_mm_warn = shift };
+        $pr_tags_rs = $pr_note_rs->first->cd->tags;
+    };
+    $pr_tags_count = $pr_tags_rs->count;
+
+    ok(! $m_o_mm_warn, 'no warning on attempt to prefetch several same level has_many\'s (M -> 1 -> M + M)');
+
+    is($queries, 1, 'prefetch one->(has_many,has_many) ran exactly 1 query');
+
+    is($pr_tags_count, $tags_count, 'equal count of prefetched relations over several same level has_many\'s (M -> 1 -> M + M)');
+
+    for ($pr_tags_rs, $tags_rs) {
+        $_->result_class ('DBIx::Class::ResultClass::HashRefInflator');
+    }
+
+    is_deeply ([$pr_tags_rs->all], [$tags_rs->all], 'same structure returned with and without prefetch over several same level has_many\'s (M -> 1 -> M + M)');
+}
+
+# remove this closure once the TODO above is working
+my $w;
+{
+    local $SIG{__WARN__} = sub { $w = shift };
+
+    my $rs = $schema->resultset('CD')->search ({ 'me.title' => 'Forkful of bees' }, { prefetch => [qw/tracks tags/] });
+    for (qw/all count next first/) {
+        undef $w;
+        my @stuff = $rs->search()->$_;
+        like ($w, qr/will currently disrupt both the functionality of .rs->count\(\), and the amount of objects retrievable via .rs->next\(\)/,
+            "warning on ->$_ attempt prefetching several same level has_manys (1 -> M + M)");
+    }
+    my $rs2 = $schema->resultset('LinerNotes')->search ({ notes => 'Buy Whiskey!' }, { prefetch => { cd => [qw/tags tracks/] } });
+    for (qw/all count next first/) {
+        undef $w;
+        my @stuff = $rs2->search()->$_;
+        like ($w, qr/will currently disrupt both the functionality of .rs->count\(\), and the amount of objects retrievable via .rs->next\(\)/,
+            "warning on ->$_ attempt prefetching several same level has_manys (M -> 1 -> M + M)");
+    }
+}