From: Michael G Schwern <mschwern@cpan.org>
Date: Tue, 11 Mar 2008 01:18:49 +0000 (+0000)
Subject: Fixed a heisenbug where looking at a column group would cause it to be shared.
X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=commitdiff_plain;h=96eab6f8adc4e23f4212aa6b6bf681137aa5f654;p=dbsrgits%2FDBIx-Class-Historic.git

Fixed a heisenbug where looking at a column group would cause it to be shared.
---

diff --git a/lib/DBIx/Class/CDBICompat/ColumnGroups.pm b/lib/DBIx/Class/CDBICompat/ColumnGroups.pm
index 530aaac..f9dd69d 100644
--- a/lib/DBIx/Class/CDBICompat/ColumnGroups.pm
+++ b/lib/DBIx/Class/CDBICompat/ColumnGroups.pm
@@ -4,6 +4,8 @@ package # hide from PAUSE
 use strict;
 use warnings;
 
+use Storable 'dclone';
+
 use base qw/DBIx::Class::Row/;
 
 __PACKAGE__->mk_classdata('_column_groups' => { });
@@ -29,7 +31,9 @@ sub _add_column_group {
 sub _register_column_group {
   my ($class, $group, @cols) = @_;
 
-  my $groups = { %{$class->_column_groups} };
+  # Must do a complete deep copy else column groups
+  # might accidentally be shared.
+  my $groups = dclone $class->_column_groups;
 
   if ($group eq 'Primary') {
     $class->set_primary_key(@cols);
diff --git a/t/cdbi-t/early_column_heisenbug.t b/t/cdbi-t/early_column_heisenbug.t
new file mode 100644
index 0000000..09ea6d9
--- /dev/null
+++ b/t/cdbi-t/early_column_heisenbug.t
@@ -0,0 +1,28 @@
+use strict;
+
+use Test::More;
+
+BEGIN {
+  eval "use DBIx::Class::CDBICompat;";
+  plan $@ ? (skip_all => "Class::Trigger and DBIx::ContextualFetch required: $@")
+          : ('no_plan');
+}
+
+
+{
+    package Thing;
+    use base qw(DBIx::Class::CDBICompat);
+}
+
+{
+    package Stuff;
+    use base qw(DBIx::Class::CDBICompat);
+}
+
+# There was a bug where looking at a column group before any were
+# set would cause them to be shared across classes.
+is_deeply [Stuff->columns("Essential")], [];
+Thing->columns(Essential => qw(foo bar baz));
+is_deeply [Stuff->columns("Essential")], [];
+
+1;