From: Peter Rabbitson <ribasushi@cpan.org>
Date: Wed, 13 Jul 2016 15:06:30 +0000 (+0200)
Subject: Fix inexplicable 5.8.x C3 errors - roll back e6efde04
X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?p=dbsrgits%2FDBIx-Class.git;a=commitdiff_plain;h=c356fcb1919c92e9f9b1dfe9fcc4c4cd33dc5ad6

Fix inexplicable 5.8.x C3 errors - roll back e6efde04

The optimization ends up breaking the entire C3 subsystem at a crucial time
when add_columns has to see the correct register_column in order for IC::DT
to populate the right column_info.

Most importantly it seems that Class::C3::XS makes this optimization entirely
moot (in fact minimal testing indicates things getting *faster* instead)
---

diff --git a/Changes b/Changes
index 1884dd0..72d7647 100644
--- a/Changes
+++ b/Changes
@@ -65,6 +65,8 @@ Revision history for DBIx::Class
           create()/populate()
         - Fix spurious warning on MSSQL cursor invalidation retries (RT#102166)
         - Fix several corner cases with Many2Many over custom relationships
+        - Fix corner cases of C3 composition being broken on OLD_MRO (5.8.x)
+          only: https://github.com/frioux/DBIx-Class-Helpers/issues/61
 
     * Misc
         - Add explicit test for pathological example of asymmetric IC::DT setup
diff --git a/lib/DBIx/Class/Schema.pm b/lib/DBIx/Class/Schema.pm
index 83d7e09..17a8bba 100644
--- a/lib/DBIx/Class/Schema.pm
+++ b/lib/DBIx/Class/Schema.pm
@@ -244,10 +244,6 @@ sub load_namespaces {
 
   my @to_register;
   {
-    no warnings qw/redefine/;
-    local *Class::C3::reinitialize = sub { } if DBIx::Class::_ENV_::OLD_MRO;
-    use warnings qw/redefine/;
-
     # ensure classes are loaded and attached in inheritance order
     for my $result_class (values %$results_by_source_name) {
       $class->ensure_class_loaded($result_class);
@@ -301,8 +297,6 @@ sub load_namespaces {
         .'with no corresponding Result class';
   }
 
-  Class::C3->reinitialize if DBIx::Class::_ENV_::OLD_MRO;
-
   $class->register_class(@$_) for (@to_register);
 
   return;
@@ -384,10 +378,6 @@ sub load_classes {
 
   my @to_register;
   {
-    no warnings qw/redefine/;
-    local *Class::C3::reinitialize = sub { } if DBIx::Class::_ENV_::OLD_MRO;
-    use warnings qw/redefine/;
-
     foreach my $prefix (keys %comps_for) {
       foreach my $comp (@{$comps_for{$prefix}||[]}) {
         my $comp_class = "${prefix}::${comp}";
@@ -404,7 +394,6 @@ sub load_classes {
       }
     }
   }
-  Class::C3->reinitialize if DBIx::Class::_ENV_::OLD_MRO;
 
   foreach my $to (@to_register) {
     $class->register_class(@$to);
@@ -1041,10 +1030,6 @@ sub compose_namespace {
   #$schema->class_mappings({});
 
   {
-    no warnings qw/redefine/;
-    local *Class::C3::reinitialize = sub { } if DBIx::Class::_ENV_::OLD_MRO;
-    use warnings qw/redefine/;
-
     foreach my $source_name ($self->sources) {
       my $orig_source = $self->source($source_name);
 
@@ -1064,7 +1049,8 @@ sub compose_namespace {
       for qw(class source resultset);
   }
 
-  Class::C3->reinitialize() if DBIx::Class::_ENV_::OLD_MRO;
+  # needed to cover the newly installed stuff via quote_sub above
+  Class::C3->reinitialize if DBIx::Class::_ENV_::OLD_MRO;
 
   # Give each composed class yet another *schema-less* source copy
   # this is used for the freeze/thaw cycle
@@ -1752,6 +1738,9 @@ sub compose_connection {
   my $schema = $self->compose_namespace($target, 'DBIx::Class::ResultSetProxy');
   quote_sub "${target}::schema", '$s', { '$s' => \$schema };
 
+  # needed to cover the newly installed stuff via quote_sub above
+  Class::C3->reinitialize if DBIx::Class::_ENV_::OLD_MRO;
+
   $schema->connection(@info);
   foreach my $source_name ($schema->sources) {
     my $source = $schema->source($source_name);
diff --git a/t/lib/DBICTest/DeployComponent.pm b/t/lib/DBICTest/DeployComponent.pm
index 590fc25..99fbbd7 100644
--- a/t/lib/DBICTest/DeployComponent.pm
+++ b/t/lib/DBICTest/DeployComponent.pm
@@ -1,9 +1,14 @@
 #   belongs to t/86sqlt.t
 package # hide from PAUSE
     DBICTest::DeployComponent;
+
 use warnings;
 use strict;
 
+# Part of a test, important to remain as-is
+# see also DBICTest::Schema::Track
+use base 'DBIx::Class::Core';
+
 our $hook_cb;
 
 sub sqlt_deploy_hook {
diff --git a/t/lib/DBICTest/Schema/Track.pm b/t/lib/DBICTest/Schema/Track.pm
index 10d49f7..ef3b14d 100644
--- a/t/lib/DBICTest/Schema/Track.pm
+++ b/t/lib/DBICTest/Schema/Track.pm
@@ -7,6 +7,8 @@ use strict;
 use base 'DBICTest::BaseResult';
 use DBICTest::Util 'check_customcond_args';
 
+# The component order is Part of a test,
+# important to remain as-is
 __PACKAGE__->load_components(qw{
     +DBICTest::DeployComponent
     InflateColumn::DateTime