use strict;
-use warnings;
+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 );
-}
+my $schema = DBICTest->init_schema();
+my $sdebug = $schema->storage->debug;
# once the following TODO is complete, remove the 2 warning tests immediately
# after the TODO block
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)');
+ $schema->storage->debugcb (undef);
+ $schema->storage->debug ($sdebug);
- for ($pr_tracks_rs, $tracks_rs) {
- $_->result_class ('DBIx::Class::ResultClass::HashRefInflator');
- }
-
- is_deeply ([$pr_tracks_rs->all], [$tracks_rs->all], 'same structure returned with and without prefetch over several same level has_many\'s (1 -> M + M)');
+ is($pr_tracks_count, $tracks_count, 'equal count of prefetched relations over several same level has_many\'s (1 -> M + M)');
+ is ($pr_tracks_rs->all, $tracks_rs->all, 'equal amount of objects 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/]
+ cd => [qw/tracks tags/]
},
});
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');
+ $schema->storage->debugcb (undef);
+ $schema->storage->debug ($sdebug);
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], [$tags_rs->all], 'same structure returned with and without prefetch over several same level has_many\'s (M -> 1 -> M + M)');
+ is($pr_tags_rs->all, $tags_rs->all, 'equal amount of objects 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 $warn_re = qr/will explode the number of row objects retrievable via/;
+
+ my (@w, @dummy);
+ local $SIG{__WARN__} = sub { $_[0] =~ $warn_re ? push @w, @_ : warn @_ };
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)");
- }
+ @w = ();
+ @dummy = $rs->first;
+ is (@w, 1, '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)");
- }
+ @w = ();
+ @dummy = $rs2->first;
+ is (@w, 1, 'warning on attempt prefetching several same level has_manys (M -> 1 -> M + M)');
}
-__END__
-The solution is to rewrite ResultSet->_collapse_result() and
-ResultSource->resolve_prefetch() to focus on the final results from the collapse
-of the data. Right now, the code doesn't treat the columns from the various
-tables as grouped entities. While there is a concept of hierarchy (so that
-prefetching down relationships does work as expected), there is no idea of what
-the final product should look like and how the various columns in the row would
-play together. So, the actual prefetch datastructure from the search would be
-very useful in working through this problem. We already have access to the PKs
-and sundry for those. So, when collapsing the search result, we know we are
-looking for 1 cd object. We also know we're looking for tracks and tags records
--independently- of each other. So, we can grab the data for tracks and data for
-tags separately, uniqueing on the PK as appropriate. Then, when we're done with
-the given cd object's datastream, we know we're good. This should work for all
-the various scenarios.
-
-My reccommendation is the row's data is preprocessed first, breaking it up into
-the data for each of the component tables. (This could be done in the single
-table case, too, but probably isn't necessary.) So, starting with something
-like:
- my $row = {
- t1.col1 => 1,
- t1.col2 => 2,
- t2.col1 => 3,
- t2.col2 => 4,
- t3.col1 => 5,
- t3.col2 => 6,
- };
-it is massaged to look something like:
- my $row_massaged = {
- t1 => { col1 => 1, col2 => 2 },
- t2 => { col1 => 3, col2 => 4 },
- t3 => { col1 => 5, col2 => 6 },
- };
-At this point, find the stuff that's different is easy enough to do and slotting
-things into the right spot is, likewise, pretty straightforward. Instead of
-storing things in a AoH, store them in a HoH keyed on the PKs of the the table,
-then convert to an AoH after all collapsing is done.
-
-This implies that the collapse attribute can probably disappear or, at the
-least, be turned into a boolean (which is how it's used in every other place).
+done_testing;
projects / dbsrgits/DBIx-Class.git / blobdiff