From: Peter Rabbitson Date: Sun, 20 Apr 2008 18:44:16 +0000 (+0000) Subject: Split prefetch related tests from 76joins.t X-Git-Tag: v0.08240~482 X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=commitdiff_plain;h=96e7f9ec94671f14005e5b2a159c7a555fde21d9;p=dbsrgits%2FDBIx-Class.git Split prefetch related tests from 76joins.t --- diff --git a/t/76joins.t b/t/76joins.t index 101d71f..dba7c00 100644 --- a/t/76joins.t +++ b/t/76joins.t @@ -16,7 +16,7 @@ BEGIN { eval "use DBD::SQLite"; plan $@ ? ( skip_all => 'needs DBD::SQLite for testing' ) - : ( tests => 64 ); + : ( tests => 16 ); } # figure out if we've got a version of sqlite that is older than 3.2.6, in @@ -157,315 +157,3 @@ cmp_ok( $rs->count, '==', 1, "Single record in resultset"); is($rs->first->name, 'We Are Goth', 'Correct record returned'); -# bug in 0.07000 caused attr (join/prefetch) to be modifed by search -# so we check the search & attr arrays are not modified -my $search = { 'artist.name' => 'Caterwauler McCrae' }; -my $attr = { prefetch => [ qw/artist liner_notes/ ], - order_by => 'me.cdid' }; -my $search_str = Dumper($search); -my $attr_str = Dumper($attr); - -$rs = $schema->resultset("CD")->search($search, $attr); - -is(Dumper($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'); - -my $queries = 0; -$schema->storage->debugcb(sub { $queries++; }); -$schema->storage->debug(1); - -my @cd = $rs->all; - -is($cd[0]->title, 'Spoonful of bees', 'First record returned ok'); - -ok(!defined $cd[0]->liner_notes, 'No prefetch for NULL LEFT join'); - -is($cd[1]->{_relationship_data}{liner_notes}->notes, 'Buy Whiskey!', 'Prefetch for present LEFT JOIN'); - -is(ref $cd[1]->liner_notes, 'DBICTest::LinerNotes', 'Prefetch returns correct class'); - -is($cd[2]->{_inflated_column}{artist}->name, 'Caterwauler McCrae', 'Prefetch on parent object ok'); - -is($queries, 1, 'prefetch ran only 1 select statement'); - -$schema->storage->debug($orig_debug); -$schema->storage->debugobj->callback(undef); - -# test for partial prefetch via columns attr -my $cd = $schema->resultset('CD')->find(1, - { - columns => [qw/title artist.name/], - join => { 'artist' => {} } - } -); -ok(eval { $cd->artist->name eq 'Caterwauler McCrae' }, 'single related column prefetched'); - -# start test for nested prefetch SELECT count -$queries = 0; -$schema->storage->debugcb(sub { $queries++ }); -$schema->storage->debug(1); - -$rs = $schema->resultset('Tag')->search( - {}, - { - prefetch => { cd => 'artist' } - } -); - -my $tag = $rs->first; - -is( $tag->cd->title, 'Spoonful of bees', 'step 1 ok for nested prefetch' ); - -is( $tag->cd->artist->name, 'Caterwauler McCrae', 'step 2 ok for nested prefetch'); - -# count the SELECTs -#$selects++ if /SELECT(?!.*WHERE 1=0.*)/; -is($queries, 1, 'nested prefetch ran exactly 1 select statement (excluding column_info)'); - -$queries = 0; - -is($tag->search_related('cd')->search_related('artist')->first->name, - 'Caterwauler McCrae', - 'chained belongs_to->belongs_to search_related ok'); - -is($queries, 0, 'chained search_related after belontgs_to->belongs_to prefetch ran no queries'); - -$queries = 0; - -$cd = $schema->resultset('CD')->find(1, { prefetch => 'artist' }); - -is($cd->{_inflated_column}{artist}->name, 'Caterwauler McCrae', 'artist prefetched correctly on find'); - -is($queries, 1, 'find with prefetch ran exactly 1 select statement (excluding column_info)'); - -$queries = 0; - -$schema->storage->debugcb(sub { $queries++; }); - -$cd = $schema->resultset('CD')->find(1, { prefetch => { cd_to_producer => 'producer' } }); - -is($cd->producers->first->name, 'Matt S Trout', 'many_to_many accessor ok'); - -is($queries, 1, 'many_to_many accessor with nested prefetch ran exactly 1 query'); - -$queries = 0; - -my $producers = $cd->search_related('cd_to_producer')->search_related('producer'); - -is($producers->first->name, 'Matt S Trout', 'chained many_to_many search_related ok'); - -is($queries, 0, 'chained search_related after many_to_many prefetch ran no queries'); - -$schema->storage->debug($orig_debug); -$schema->storage->debugobj->callback(undef); - -$rs = $schema->resultset('Tag')->search( - {}, - { - join => { cd => 'artist' }, - prefetch => { cd => 'artist' } - } -); - -cmp_ok( $rs->count, '>=', 0, 'nested prefetch does not duplicate joins' ); - -my ($artist) = $schema->resultset("Artist")->search({ 'cds.year' => 2001 }, - { order_by => 'artistid DESC', join => 'cds' }); - -is($artist->name, 'Random Boy Band', "Join search by object ok"); - -my @cds = $schema->resultset("CD")->search({ 'liner_notes.notes' => 'Buy Merch!' }, - { join => 'liner_notes' }); - -cmp_ok(scalar @cds, '==', 1, "Single CD retrieved via might_have"); - -is($cds[0]->title, "Generic Manufactured Singles", "Correct CD retrieved"); - -my @artists = $schema->resultset("Artist")->search({ 'tags.tag' => 'Shiny' }, - { join => { 'cds' => 'tags' } }); - -cmp_ok( @artists, '==', 2, "two-join search ok" ); - -$rs = $schema->resultset("CD")->search( - {}, - { group_by => [qw/ title me.cdid /] } -); - -SKIP: { - skip "SQLite < 3.2.6 doesn't understand COUNT(DISTINCT())", 1 - if $is_broken_sqlite; - cmp_ok( $rs->count, '==', 5, "count() ok after group_by on main pk" ); -} - -cmp_ok( scalar $rs->all, '==', 5, "all() returns same count as count() after group_by on main pk" ); - -$rs = $schema->resultset("CD")->search( - {}, - { join => [qw/ artist /], group_by => [qw/ artist.name /] } -); - -SKIP: { - skip "SQLite < 3.2.6 doesn't understand COUNT(DISTINCT())", 1 - if $is_broken_sqlite; - cmp_ok( $rs->count, '==', 3, "count() ok after group_by on related column" ); -} - -$rs = $schema->resultset("Artist")->search( - {}, - { join => [qw/ cds /], group_by => [qw/ me.name /], having =>{ 'MAX(cds.cdid)'=> \'< 5' } } -); - -cmp_ok( $rs->all, '==', 2, "results ok after group_by on related column with a having" ); - -$rs = $rs->search( undef, { having =>{ 'count(*)'=> \'> 2' }}); - -cmp_ok( $rs->all, '==', 1, "count() ok after group_by on related column with a having" ); - -$rs = $schema->resultset("Artist")->search( - { 'cds.title' => 'Spoonful of bees', - 'cds_2.title' => 'Forkful of bees' }, - { join => [ 'cds', 'cds' ] }); - -SKIP: { - skip "SQLite < 3.2.6 doesn't understand COUNT(DISTINCT())", 1 - if $is_broken_sqlite; - cmp_ok($rs->count, '==', 1, "single artist returned from multi-join"); -} - -is($rs->next->name, 'Caterwauler McCrae', "Correct artist returned"); - -$cd = $schema->resultset('Artist')->first->create_related('cds', - { - title => 'Unproduced Single', - year => 2007 -}); - -my $left_join = $schema->resultset('CD')->search( - { 'me.cdid' => $cd->cdid }, - { prefetch => { cd_to_producer => 'producer' } } -); - -cmp_ok($left_join, '==', 1, 'prefetch with no join record present'); - -$queries = 0; -$schema->storage->debugcb(sub { $queries++ }); -$schema->storage->debug(1); - -my $tree_like = - $schema->resultset('TreeLike')->find(4, - { join => { parent => { parent => 'parent' } }, - prefetch => { parent => { parent => 'parent' } } }); - -is($tree_like->name, 'quux', 'Bottom of tree ok'); -$tree_like = $tree_like->parent; -is($tree_like->name, 'baz', 'First level up ok'); -$tree_like = $tree_like->parent; -is($tree_like->name, 'bar', 'Second level up ok'); -$tree_like = $tree_like->parent; -is($tree_like->name, 'foo', 'Third level up ok'); - -$schema->storage->debug($orig_debug); -$schema->storage->debugobj->callback(undef); - -cmp_ok($queries, '==', 1, 'Only one query run'); - -$tree_like = $schema->resultset('TreeLike')->search({'me.id' => 1}); -$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 }, - { 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 }, - { join => [qw/children children/] } - )->search_related('children', { 'children_4.id' => 6 }, { prefetch => 'children' } - )->first->children->first; }; -is(eval { $tree_like->name }, 'fong', 'Tree with multiple has_many joins ok'); - -# test that collapsed joins don't get a _2 appended to the alias - -my $sql = ''; -$schema->storage->debugcb(sub { $sql = $_[1] }); -$schema->storage->debug(1); - -eval { - my $row = $schema->resultset('Artist')->search_related('cds', undef, { - join => 'tracks', - prefetch => 'tracks', - })->search_related('tracks')->first; -}; - -like( $sql, qr/^SELECT tracks_2\.trackid/, "join not collapsed for search_related" ); - -$schema->storage->debug($orig_debug); -$schema->storage->debugobj->callback(undef); - -$rs = $schema->resultset('Artist'); -$rs->create({ artistid => 4, name => 'Unknown singer-songwriter' }); -$rs->create({ artistid => 5, name => 'Emo 4ever' }); -@artists = $rs->search(undef, { prefetch => 'cds', order_by => 'artistid' }); -is(scalar @artists, 5, 'has_many prefetch with adjacent empty rows ok'); - -# ------------- -# -# Tests for multilevel has_many prefetch - -# artist resultsets - with and without prefetch -my $art_rs = $schema->resultset('Artist'); -my $art_rs_pr = $art_rs->search( - {}, - { - join => [ { cds => ['tracks'] } ], - prefetch => [ { cds => ['tracks'] } ], - cache => 1 # last test needs this - } -); - -# This test does the same operation twice - once on a -# set of items fetched from the db with no prefetch of has_many rels -# The second prefetches 2 levels of has_many -# We check things are the same by comparing the name or title -# we build everything into a hash structure and compare the one -# from each rs to see what differs - -sub make_hash_struc { - my $rs = shift; - - my $struc = {}; - foreach my $art ( $rs->all ) { - foreach my $cd ( $art->cds ) { - foreach my $track ( $cd->tracks ) { - $struc->{ $art->name }{ $cd->title }{ $track->title }++; - } - } - } - return $struc; -} - -$queries = 0; -$schema->storage->debugcb(sub { $queries++ }); -$schema->storage->debug(1); - -my $prefetch_result = make_hash_struc($art_rs_pr); - -is($queries, 1, 'nested prefetch across has_many->has_many ran exactly 1 query'); - -my $nonpre_result = make_hash_struc($art_rs); - -is_deeply( $prefetch_result, $nonpre_result, - 'Compare 2 level prefetch result to non-prefetch result' ); - -$queries = 0; - -is($art_rs_pr->search_related('cds')->search_related('tracks')->first->title, - 'Fowlin', - 'chained has_many->has_many search_related ok' - ); - -is($queries, 0, 'chained search_related after has_many->has_many prefetch ran no queries'); diff --git a/t/77prefetch.t b/t/77prefetch.t new file mode 100644 index 0000000..2276964 --- /dev/null +++ b/t/77prefetch.t @@ -0,0 +1,345 @@ +use strict; +use warnings; + +use Test::More; +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 => 48 ); +} + +# 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; +} + +# bug in 0.07000 caused attr (join/prefetch) to be modifed by search +# so we check the search & attr arrays are not modified +my $search = { 'artist.name' => 'Caterwauler McCrae' }; +my $attr = { prefetch => [ qw/artist liner_notes/ ], + order_by => 'me.cdid' }; +my $search_str = Dumper($search); +my $attr_str = Dumper($attr); + +my $rs = $schema->resultset("CD")->search($search, $attr); + +is(Dumper($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'); + +my $queries = 0; +$schema->storage->debugcb(sub { $queries++; }); +$schema->storage->debug(1); + +my @cd = $rs->all; + +is($cd[0]->title, 'Spoonful of bees', 'First record returned ok'); + +ok(!defined $cd[0]->liner_notes, 'No prefetch for NULL LEFT join'); + +is($cd[1]->{_relationship_data}{liner_notes}->notes, 'Buy Whiskey!', 'Prefetch for present LEFT JOIN'); + +is(ref $cd[1]->liner_notes, 'DBICTest::LinerNotes', 'Prefetch returns correct class'); + +is($cd[2]->{_inflated_column}{artist}->name, 'Caterwauler McCrae', 'Prefetch on parent object ok'); + +is($queries, 1, 'prefetch ran only 1 select statement'); + +$schema->storage->debug($orig_debug); +$schema->storage->debugobj->callback(undef); + +# test for partial prefetch via columns attr +my $cd = $schema->resultset('CD')->find(1, + { + columns => [qw/title artist.name/], + join => { 'artist' => {} } + } +); +ok(eval { $cd->artist->name eq 'Caterwauler McCrae' }, 'single related column prefetched'); + +# start test for nested prefetch SELECT count +$queries = 0; +$schema->storage->debugcb(sub { $queries++ }); +$schema->storage->debug(1); + +$rs = $schema->resultset('Tag')->search( + {}, + { + prefetch => { cd => 'artist' } + } +); + +my $tag = $rs->first; + +is( $tag->cd->title, 'Spoonful of bees', 'step 1 ok for nested prefetch' ); + +is( $tag->cd->artist->name, 'Caterwauler McCrae', 'step 2 ok for nested prefetch'); + +# count the SELECTs +#$selects++ if /SELECT(?!.*WHERE 1=0.*)/; +is($queries, 1, 'nested prefetch ran exactly 1 select statement (excluding column_info)'); + +$queries = 0; + +is($tag->search_related('cd')->search_related('artist')->first->name, + 'Caterwauler McCrae', + 'chained belongs_to->belongs_to search_related ok'); + +is($queries, 0, 'chained search_related after belontgs_to->belongs_to prefetch ran no queries'); + +$queries = 0; + +$cd = $schema->resultset('CD')->find(1, { prefetch => 'artist' }); + +is($cd->{_inflated_column}{artist}->name, 'Caterwauler McCrae', 'artist prefetched correctly on find'); + +is($queries, 1, 'find with prefetch ran exactly 1 select statement (excluding column_info)'); + +$queries = 0; + +$schema->storage->debugcb(sub { $queries++; }); + +$cd = $schema->resultset('CD')->find(1, { prefetch => { cd_to_producer => 'producer' } }); + +is($cd->producers->first->name, 'Matt S Trout', 'many_to_many accessor ok'); + +is($queries, 1, 'many_to_many accessor with nested prefetch ran exactly 1 query'); + +$queries = 0; + +my $producers = $cd->search_related('cd_to_producer')->search_related('producer'); + +is($producers->first->name, 'Matt S Trout', 'chained many_to_many search_related ok'); + +is($queries, 0, 'chained search_related after many_to_many prefetch ran no queries'); + +$schema->storage->debug($orig_debug); +$schema->storage->debugobj->callback(undef); + +$rs = $schema->resultset('Tag')->search( + {}, + { + join => { cd => 'artist' }, + prefetch => { cd => 'artist' } + } +); + +cmp_ok( $rs->count, '>=', 0, 'nested prefetch does not duplicate joins' ); + +my ($artist) = $schema->resultset("Artist")->search({ 'cds.year' => 2001 }, + { order_by => 'artistid DESC', join => 'cds' }); + +is($artist->name, 'Random Boy Band', "Join search by object ok"); + +my @cds = $schema->resultset("CD")->search({ 'liner_notes.notes' => 'Buy Merch!' }, + { join => 'liner_notes' }); + +cmp_ok(scalar @cds, '==', 1, "Single CD retrieved via might_have"); + +is($cds[0]->title, "Generic Manufactured Singles", "Correct CD retrieved"); + +my @artists = $schema->resultset("Artist")->search({ 'tags.tag' => 'Shiny' }, + { join => { 'cds' => 'tags' } }); + +cmp_ok( @artists, '==', 2, "two-join search ok" ); + +$rs = $schema->resultset("CD")->search( + {}, + { group_by => [qw/ title me.cdid /] } +); + +SKIP: { + skip "SQLite < 3.2.6 doesn't understand COUNT(DISTINCT())", 1 + if $is_broken_sqlite; + cmp_ok( $rs->count, '==', 5, "count() ok after group_by on main pk" ); +} + +cmp_ok( scalar $rs->all, '==', 5, "all() returns same count as count() after group_by on main pk" ); + +$rs = $schema->resultset("CD")->search( + {}, + { join => [qw/ artist /], group_by => [qw/ artist.name /] } +); + +SKIP: { + skip "SQLite < 3.2.6 doesn't understand COUNT(DISTINCT())", 1 + if $is_broken_sqlite; + cmp_ok( $rs->count, '==', 3, "count() ok after group_by on related column" ); +} + +$rs = $schema->resultset("Artist")->search( + {}, + { join => [qw/ cds /], group_by => [qw/ me.name /], having =>{ 'MAX(cds.cdid)'=> \'< 5' } } +); + +cmp_ok( $rs->all, '==', 2, "results ok after group_by on related column with a having" ); + +$rs = $rs->search( undef, { having =>{ 'count(*)'=> \'> 2' }}); + +cmp_ok( $rs->all, '==', 1, "count() ok after group_by on related column with a having" ); + +$rs = $schema->resultset("Artist")->search( + { 'cds.title' => 'Spoonful of bees', + 'cds_2.title' => 'Forkful of bees' }, + { join => [ 'cds', 'cds' ] }); + +SKIP: { + skip "SQLite < 3.2.6 doesn't understand COUNT(DISTINCT())", 1 + if $is_broken_sqlite; + cmp_ok($rs->count, '==', 1, "single artist returned from multi-join"); +} + +is($rs->next->name, 'Caterwauler McCrae', "Correct artist returned"); + +$cd = $schema->resultset('Artist')->first->create_related('cds', + { + title => 'Unproduced Single', + year => 2007 +}); + +my $left_join = $schema->resultset('CD')->search( + { 'me.cdid' => $cd->cdid }, + { prefetch => { cd_to_producer => 'producer' } } +); + +cmp_ok($left_join, '==', 1, 'prefetch with no join record present'); + +$queries = 0; +$schema->storage->debugcb(sub { $queries++ }); +$schema->storage->debug(1); + +my $tree_like = + $schema->resultset('TreeLike')->find(4, + { join => { parent => { parent => 'parent' } }, + prefetch => { parent => { parent => 'parent' } } }); + +is($tree_like->name, 'quux', 'Bottom of tree ok'); +$tree_like = $tree_like->parent; +is($tree_like->name, 'baz', 'First level up ok'); +$tree_like = $tree_like->parent; +is($tree_like->name, 'bar', 'Second level up ok'); +$tree_like = $tree_like->parent; +is($tree_like->name, 'foo', 'Third level up ok'); + +$schema->storage->debug($orig_debug); +$schema->storage->debugobj->callback(undef); + +cmp_ok($queries, '==', 1, 'Only one query run'); + +$tree_like = $schema->resultset('TreeLike')->search({'me.id' => 1}); +$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 }, + { 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 }, + { join => [qw/children children/] } + )->search_related('children', { 'children_4.id' => 6 }, { prefetch => 'children' } + )->first->children->first; }; +is(eval { $tree_like->name }, 'fong', 'Tree with multiple has_many joins ok'); + +# test that collapsed joins don't get a _2 appended to the alias + +my $sql = ''; +$schema->storage->debugcb(sub { $sql = $_[1] }); +$schema->storage->debug(1); + +eval { + my $row = $schema->resultset('Artist')->search_related('cds', undef, { + join => 'tracks', + prefetch => 'tracks', + })->search_related('tracks')->first; +}; + +like( $sql, qr/^SELECT tracks_2\.trackid/, "join not collapsed for search_related" ); + +$schema->storage->debug($orig_debug); +$schema->storage->debugobj->callback(undef); + +$rs = $schema->resultset('Artist'); +$rs->create({ artistid => 4, name => 'Unknown singer-songwriter' }); +$rs->create({ artistid => 5, name => 'Emo 4ever' }); +@artists = $rs->search(undef, { prefetch => 'cds', order_by => 'artistid' }); +is(scalar @artists, 5, 'has_many prefetch with adjacent empty rows ok'); + +# ------------- +# +# Tests for multilevel has_many prefetch + +# artist resultsets - with and without prefetch +my $art_rs = $schema->resultset('Artist'); +my $art_rs_pr = $art_rs->search( + {}, + { + join => [ { cds => ['tracks'] } ], + prefetch => [ { cds => ['tracks'] } ], + cache => 1 # last test needs this + } +); + +# This test does the same operation twice - once on a +# set of items fetched from the db with no prefetch of has_many rels +# The second prefetches 2 levels of has_many +# We check things are the same by comparing the name or title +# we build everything into a hash structure and compare the one +# from each rs to see what differs + +sub make_hash_struc { + my $rs = shift; + + my $struc = {}; + foreach my $art ( $rs->all ) { + foreach my $cd ( $art->cds ) { + foreach my $track ( $cd->tracks ) { + $struc->{ $art->name }{ $cd->title }{ $track->title }++; + } + } + } + return $struc; +} + +$queries = 0; +$schema->storage->debugcb(sub { $queries++ }); +$schema->storage->debug(1); + +my $prefetch_result = make_hash_struc($art_rs_pr); + +is($queries, 1, 'nested prefetch across has_many->has_many ran exactly 1 query'); + +my $nonpre_result = make_hash_struc($art_rs); + +is_deeply( $prefetch_result, $nonpre_result, + 'Compare 2 level prefetch result to non-prefetch result' ); + +$queries = 0; + +is($art_rs_pr->search_related('cds')->search_related('tracks')->first->title, + 'Fowlin', + 'chained has_many->has_many search_related ok' + ); + +is($queries, 0, 'chained search_related after has_many->has_many prefetch ran no queries');