--- /dev/null
+use strict;
+use warnings;
+
+use Test::More;
+use lib qw(t/lib);
+use DBICTest;
+
+my $schema = DBICTest::init_schema();
+
+plan tests => 34;
+
+my $artistid = 1;
+my $title = 'UNIQUE Constraint';
+
+my $cd1 = $schema->resultset('CD')->find_or_create({
+ artist => $artistid,
+ title => $title,
+ year => 2005,
+});
+
+my $cd2 = $schema->resultset('CD')->find(
+ {
+ artist => $artistid,
+ title => $title,
+ },
+ { key => 'artist_title' }
+);
+
+is($cd2->get_column('artist'), $cd1->get_column('artist'), 'find by specific key: artist is correct');
+is($cd2->title, $cd1->title, 'title is correct');
+is($cd2->year, $cd1->year, 'year is correct');
+
+my $cd3 = $schema->resultset('CD')->find($artistid, $title, { key => 'artist_title' });
+
+is($cd3->get_column('artist'), $cd1->get_column('artist'), 'find by specific key, ordered columns: artist is correct');
+is($cd3->title, $cd1->title, 'title is correct');
+is($cd3->year, $cd1->year, 'year is correct');
+
+my $cd4 = $schema->resultset('CD')->update_or_create(
+ {
+ artist => $artistid,
+ title => $title,
+ year => 2007,
+ },
+);
+
+ok(! $cd4->is_changed, 'update_or_create without key: row is clean');
+is($cd4->cdid, $cd2->cdid, 'cdid is correct');
+is($cd4->get_column('artist'), $cd2->get_column('artist'), 'artist is correct');
+is($cd4->title, $cd2->title, 'title is correct');
+is($cd4->year, 2007, 'updated year is correct');
+
+my $cd5 = $schema->resultset('CD')->update_or_create(
+ {
+ artist => $artistid,
+ title => $title,
+ year => 2007,
+ },
+ { key => 'artist_title' }
+);
+
+ok(! $cd5->is_changed, 'update_or_create by specific key: row is clean');
+is($cd5->cdid, $cd2->cdid, 'cdid is correct');
+is($cd5->get_column('artist'), $cd2->get_column('artist'), 'artist is correct');
+is($cd5->title, $cd2->title, 'title is correct');
+is($cd5->year, 2007, 'updated year is correct');
+
+my $cd6 = $schema->resultset('CD')->update_or_create(
+ {
+ cdid => $cd2->cdid,
+ artist => 1,
+ title => $cd2->title,
+ year => 2005,
+ },
+ { key => 'primary' }
+);
+
+ok(! $cd6->is_changed, 'update_or_create by PK: row is clean');
+is($cd6->cdid, $cd2->cdid, 'cdid is correct');
+is($cd6->get_column('artist'), $cd2->get_column('artist'), 'artist is correct');
+is($cd6->title, $cd2->title, 'title is correct');
+is($cd6->year, 2005, 'updated year is correct');
+
+my $cd7 = $schema->resultset('CD')->find_or_create(
+ {
+ artist => $artistid,
+ title => $title,
+ year => 2010,
+ },
+ { key => 'artist_title' }
+);
+
+is($cd7->cdid, $cd1->cdid, 'find_or_create by specific key: cdid is correct');
+is($cd7->get_column('artist'), $cd1->get_column('artist'), 'artist is correct');
+is($cd7->title, $cd1->title, 'title is correct');
+is($cd7->year, $cd1->year, 'year is correct');
+
+my $artist = $schema->resultset('Artist')->find($artistid);
+my $cd8 = $artist->find_or_create_related('cds',
+ {
+ artist => $artistid,
+ title => $title,
+ year => 2020,
+ },
+ { key => 'artist_title' }
+);
+
+is($cd8->cdid, $cd1->cdid, 'find_or_create related by specific key: cdid is correct');
+is($cd8->get_column('artist'), $cd1->get_column('artist'), 'artist is correct');
+is($cd8->title, $cd1->title, 'title is correct');
+is($cd8->year, $cd1->year, 'year is correct');
+
+my $cd9 = $artist->update_or_create_related('cds',
+ {
+ artist => $artistid,
+ title => $title,
+ year => 2021,
+ },
+ { key => 'artist_title' }
+);
+
+ok(! $cd9->is_changed, 'update_or_create by specific key: row is clean');
+is($cd9->cdid, $cd1->cdid, 'cdid is correct');
+is($cd9->get_column('artist'), $cd1->get_column('artist'), 'artist is correct');
+is($cd9->title, $cd1->title, 'title is correct');
+is($cd9->year, 2021, 'year is correct');
+