From: Dagfinn Ilmari Mannsåker <ilmari@ilmari.org>
Date: Mon, 22 Aug 2011 10:18:10 +0000 (+0100)
Subject: Add unique constraints on columns referenced by foreign keys
X-Git-Url: https://git.brokenzipper.com/gitweb?a=commitdiff_plain;h=45d3acef815c1fb052b317bc81bb7470a34cde30;p=chaz%2Fp5-DBIx-Class-ResultSet-RecursiveUpdate

Add unique constraints on columns referenced by foreign keys

PostgreSQL correctly throws an error if you try to create a foreign key
and there isn't a unique constraint on the referenced columns, since it
could end up referencing multiple rows.
---

diff --git a/t/lib/DBSchema/Result/Dvd.pm b/t/lib/DBSchema/Result/Dvd.pm
index aedd435..b355e52 100644
--- a/t/lib/DBSchema/Result/Dvd.pm
+++ b/t/lib/DBSchema/Result/Dvd.pm
@@ -45,6 +45,8 @@ __PACKAGE__->add_columns(
   },
 );
 __PACKAGE__->set_primary_key('dvd_id');
+__PACKAGE__->add_unique_constraint(dvd_name => [qw(name)]);
+__PACKAGE__->add_unique_constraint(dvd_twokeys => [qw(twokeysfk)]);
 __PACKAGE__->belongs_to('owner', 'DBSchema::Result::User', 'owner');
 __PACKAGE__->belongs_to('current_borrower', 'DBSchema::Result::User', 'current_borrower', { join_type => "LEFT" });
 __PACKAGE__->has_many('dvdtags', 'Dvdtag', { 'foreign.dvd' => 'self.dvd_id' });