X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=t%2F77prefetch.t;h=e6273c6c5fdb59ea50e78603358c4d094218db14;hb=9f2d17e9dc71dabc3263cc7c2ad794f7eb24d223;hp=2276964809e49d3865433171562ac8a850653af4;hpb=96e7f9ec94671f14005e5b2a159c7a555fde21d9;p=dbsrgits%2FDBIx-Class.git

diff --git a/t/77prefetch.t b/t/77prefetch.t
index 2276964..e6273c6 100644
--- a/t/77prefetch.t
+++ b/t/77prefetch.t
@@ -2,6 +2,7 @@ use strict;
 use warnings;  
 
 use Test::More;
+use Test::Exception;
 use lib qw(t/lib);
 use DBICTest;
 use Data::Dumper;
@@ -16,7 +17,7 @@ BEGIN {
     eval "use DBD::SQLite";
     plan $@
         ? ( skip_all => 'needs DBD::SQLite for testing' )
-        : ( tests => 48 );
+        : ( tests => 68 );
 }
 
 # figure out if we've got a version of sqlite that is older than 3.2.6, in
@@ -45,6 +46,49 @@ is(Dumper($search), $search_str, 'Search hash untouched after search()');
 is(Dumper($attr), $attr_str, 'Attribute hash untouched after search()');
 cmp_ok($rs + 0, '==', 3, 'Correct number of records returned');
 
+# A search() with prefetch seems to pollute an already joined resultset
+# in a way that offsets future joins (adapted from a test case by Debolaz)
+{
+  my ($cd_rs, $attrs);
+
+  # test a real-life case - rs is obtained by an implicit m2m join
+  $cd_rs = $schema->resultset ('Producer')->first->cds;
+  $attrs = Dumper $cd_rs->{attrs};
+
+  $cd_rs->search ({})->all;
+  is (Dumper ($cd_rs->{attrs}), $attrs, 'Resultset attributes preserved after a simple search');
+
+  lives_ok (sub {
+    $cd_rs->search ({'artist.artistid' => 1}, { prefetch => 'artist' })->all;
+    is (Dumper ($cd_rs->{attrs}), $attrs, 'Resultset attributes preserved after search with prefetch');
+  }, 'first prefetching search ok');
+
+  lives_ok (sub {
+    $cd_rs->search ({'artist.artistid' => 1}, { prefetch => 'artist' })->all;
+    is (Dumper ($cd_rs->{attrs}), $attrs, 'Resultset attributes preserved after another search with prefetch')
+  }, 'second prefetching search ok');
+
+
+  # test a regular rs with an empty seen_join injected - it should still work!
+  $cd_rs = $schema->resultset ('CD');
+  $cd_rs->{attrs}{seen_join}  = {};
+  $attrs = Dumper $cd_rs->{attrs};
+
+  $cd_rs->search ({})->all;
+  is (Dumper ($cd_rs->{attrs}), $attrs, 'Resultset attributes preserved after a simple search');
+
+  lives_ok (sub {
+    $cd_rs->search ({'artist.artistid' => 1}, { prefetch => 'artist' })->all;
+    is (Dumper ($cd_rs->{attrs}), $attrs, 'Resultset attributes preserved after search with prefetch');
+  }, 'first prefetching search ok');
+
+  lives_ok (sub {
+    $cd_rs->search ({'artist.artistid' => 1}, { prefetch => 'artist' })->all;
+    is (Dumper ($cd_rs->{attrs}), $attrs, 'Resultset attributes preserved after another search with prefetch')
+  }, 'second prefetching search ok');
+}
+
+
 my $queries = 0;
 $schema->storage->debugcb(sub { $queries++; });
 $schema->storage->debug(1);
@@ -69,7 +113,7 @@ $schema->storage->debugobj->callback(undef);
 # test for partial prefetch via columns attr
 my $cd = $schema->resultset('CD')->find(1,
     {
-      columns => [qw/title artist.name/], 
+      columns => [qw/title artist artist.name/], 
       join => { 'artist' => {} }
     }
 );
@@ -227,7 +271,7 @@ $schema->storage->debugcb(sub { $queries++ });
 $schema->storage->debug(1);
 
 my $tree_like =
-     $schema->resultset('TreeLike')->find(4,
+     $schema->resultset('TreeLike')->find(5,
        { join     => { parent => { parent => 'parent' } },
          prefetch => { parent => { parent => 'parent' } } });
 
@@ -244,21 +288,21 @@ $schema->storage->debugobj->callback(undef);
 
 cmp_ok($queries, '==', 1, 'Only one query run');
 
-$tree_like = $schema->resultset('TreeLike')->search({'me.id' => 1});
+$tree_like = $schema->resultset('TreeLike')->search({'me.id' => 2});
 $tree_like = $tree_like->search_related('children')->search_related('children')->search_related('children')->first;
 is($tree_like->name, 'quux', 'Tree search_related ok');
 
 $tree_like = $schema->resultset('TreeLike')->search_related('children',
-    { 'children.id' => 2, 'children_2.id' => 3 },
+    { 'children.id' => 3, 'children_2.id' => 4 },
     { prefetch => { children => 'children' } }
   )->first;
 is(eval { $tree_like->children->first->children->first->name }, 'quux',
    'Tree search_related with prefetch ok');
 
 $tree_like = eval { $schema->resultset('TreeLike')->search(
-    { 'children.id' => 2, 'children_2.id' => 5 }, 
+    { 'children.id' => 3, 'children_2.id' => 6 }, 
     { join => [qw/children children/] }
-  )->search_related('children', { 'children_4.id' => 6 }, { prefetch => 'children' }
+  )->search_related('children', { 'children_4.id' => 7 }, { prefetch => 'children' }
   )->first->children->first; };
 is(eval { $tree_like->name }, 'fong', 'Tree with multiple has_many joins ok');
 
@@ -343,3 +387,91 @@ is($art_rs_pr->search_related('cds')->search_related('tracks')->first->title,
   );
 
 is($queries, 0, 'chained search_related after has_many->has_many prefetch ran no queries');
+
+# 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);
+
+    $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 $track = $schema->resultset('CD')->search ({ 'me.title' => 'Forkful of bees' }, { prefetch => [qw/tracks tags/] })->first->tracks->first;
+    like ($w, qr/will currently disrupt both the functionality of .rs->count\(\), and the amount of objects retrievable via .rs->next\(\)/,
+        'warning on attempt to prefetch several same level has_many\'s (1 -> M + M)');
+    my $tag = $schema->resultset('LinerNotes')->search ({ notes => 'Buy Whiskey!' }, { prefetch => { cd => [qw/tags tracks/] } })->first->cd->tags->first;
+    like ($w, qr/will currently disrupt both the functionality of .rs->count\(\), and the amount of objects retrievable via .rs->next\(\)/,
+        'warning on attempt to prefetch several same level has_many\'s (M -> 1 -> M + M)');
+}