Fix obscure failure of CDBICompat accessor install on 5.8

[dbsrgits/DBIx-Class.git] / lib / DBIx / Class / CDBICompat / ColumnGroups.pm

diff --git a/lib/DBIx/Class/CDBICompat/ColumnGroups.pm b/lib/DBIx/Class/CDBICompat/ColumnGroups.pm
index 77d6112..44a6010 100644 (file)
--- a/lib/DBIx/Class/CDBICompat/ColumnGroups.pm
+++ b/lib/DBIx/Class/CDBICompat/ColumnGroups.pm
@@ -1,7 +1,10 @@
-package DBIx::Class::CDBICompat::ColumnGroups;
+package # hide from PAUSE
+    DBIx::Class::CDBICompat::ColumnGroups;
 
 use strict;
 use warnings;
+use Sub::Name ();
+use List::Util ();
 
 use base qw/DBIx::Class::Row/;
 
@@ -11,44 +14,143 @@ sub columns {
   my $proto = shift;
   my $class = ref $proto || $proto;
   my $group = shift || "All";
+  $class->_init_result_source_instance();
+
   $class->_add_column_group($group => @_) if @_;
   return $class->all_columns    if $group eq "All";
   return $class->primary_column if $group eq "Primary";
-  return keys %{$class->_column_groups->{$group}};
+
+  my $grp = $class->_column_groups->{$group};
+  my @grp_cols = sort { $grp->{$b} <=> $grp->{$a} } (keys %$grp);
+  return @grp_cols;
 }
 
 sub _add_column_group {
   my ($class, $group, @cols) = @_;
+  $class->mk_group_accessors(column => @cols);
   $class->add_columns(@cols);
   $class->_register_column_group($group => @cols);
 }
 
+sub add_columns {
+  my ($class, @cols) = @_;
+  $class->result_source_instance->add_columns(@cols);
+}
+
 sub _register_column_group {
   my ($class, $group, @cols) = @_;
 
-  my $groups = { %{$class->_column_groups} };
+  # Must do a complete deep copy else column groups
+  # might accidentally be shared.
+  my $groups = DBIx::Class::_Util::deep_clone( $class->_column_groups );
 
   if ($group eq 'Primary') {
     $class->set_primary_key(@cols);
-    $groups->{'Essential'}{$_} ||= {} for @cols;
+    delete $groups->{'Essential'}{$_} for @cols;
+    my $first = List::Util::max(values %{$groups->{'Essential'}});
+    $groups->{'Essential'}{$_} = ++$first for reverse @cols;
   }
 
   if ($group eq 'All') {
     unless (exists $class->_column_groups->{'Primary'}) {
-      $groups->{'Primary'}{$cols[0]} = {};
+      $groups->{'Primary'}{$cols[0]} = 1;
       $class->set_primary_key($cols[0]);
     }
     unless (exists $class->_column_groups->{'Essential'}) {
-      $groups->{'Essential'}{$cols[0]} = {};
+      $groups->{'Essential'}{$cols[0]} = 1;
     }
   }
 
-  $groups->{$group}{$_} ||= {} for @cols;
+  delete $groups->{$group}{$_} for @cols;
+  my $first = List::Util::max(values %{$groups->{$group}});
+  $groups->{$group}{$_} = ++$first for reverse @cols;
 
   $class->_column_groups($groups);
 }
 
-sub all_columns { return shift->result_source->columns; }
+# CDBI will never overwrite an accessor, but it only uses one
+# accessor for all column types.  DBIC uses many different
+# accessor types so, for example, if you declare a column()
+# and then a has_a() for that same column it must overwrite.
+#
+# To make this work CDBICompat has decide if an accessor
+# method was put there by itself and only then overwrite.
+{
+  my %our_accessors;
+
+  sub _has_custom_accessor {
+    my($class, $name) = @_;
+
+    no strict 'refs';
+    my $existing_accessor = *{$class .'::'. $name}{CODE};
+
+    return(
+      defined $existing_accessor
+        and
+      ! $our_accessors{$existing_accessor}
+        and
+      # under 5.8 mro the CODE slot may simply be a "cached method"
+      ! (
+        DBIx::Class::_ENV_::OLD_MRO
+          and
+        grep {
+          $_ ne $class
+            and
+          ($_->can($name)||0) == $existing_accessor
+        } @{mro::get_linear_isa($class)}
+      )
+    )
+  }
+
+  sub _deploy_accessor {
+    my($class, $name, $accessor) = @_;
+
+    return if $class->_has_custom_accessor($name);
+
+    {
+      no strict 'refs';
+      no warnings 'redefine';
+      my $fullname = join '::', $class, $name;
+      *$fullname = Sub::Name::subname $fullname, $accessor;
+    }
+
+    $our_accessors{$accessor}++;
+
+    return 1;
+  }
+}
+
+sub _mk_group_accessors {
+  my ($class, $type, $group, @fields) = @_;
+
+  # So we don't have to do lots of lookups inside the loop.
+  my $maker = $class->can($type) unless ref $type;
+
+  # warn "$class $type $group\n";
+  foreach my $field (@fields) {
+    if( $field eq 'DESTROY' ) {
+        carp("Having a data accessor named DESTROY in ".
+             "'$class' is unwise.");
+    }
+
+    my $name = $field;
+
+    ($name, $field) = @$field if ref $field;
+
+    my $accessor = $class->$maker($group, $field);
+    my $alias = "_${name}_accessor";
+
+    # warn "  $field $alias\n";
+    {
+      no strict 'refs';
+
+      $class->_deploy_accessor($name,  $accessor);
+      $class->_deploy_accessor($alias, $accessor);
+    }
+  }
+}
+
+sub all_columns { return shift->result_source_instance->columns; }
 
 sub primary_column {
   my ($class) = @_;
@@ -56,6 +158,10 @@ sub primary_column {
   return wantarray ? @pri : $pri[0];
 }
 
+sub _essential {
+    return shift->columns("Essential");
+}
+
 sub find_column {
   my ($class, $col) = @_;
   return $col if $class->has_column($col);
@@ -63,7 +169,8 @@ sub find_column {
 
 sub __grouper {
   my ($class) = @_;
-  return bless({ class => $class}, 'DBIx::Class::CDBICompat::ColumnGroups::GrouperShim');
+  my $grouper = { class => $class };
+  return bless($grouper, 'DBIx::Class::CDBICompat::ColumnGroups::GrouperShim');
 }
 
 sub _find_columns {
@@ -71,7 +178,8 @@ sub _find_columns {
   return map { $class->find_column($_) } @col;
 }
 
-package DBIx::Class::CDBICompat::ColumnGroups::GrouperShim;
+package # hide from PAUSE (should be harmless, no POD no Version)
+    DBIx::Class::CDBICompat::ColumnGroups::GrouperShim;
 
 sub groups_for {
   my ($self, @cols) = @_;
@@ -83,6 +191,5 @@ sub groups_for {
   }
   return keys %groups;
 }
-    
 
 1;