Lose another dependency: Class::Inspector

[dbsrgits/DBIx-Class.git] / lib / DBIx / Class / ResultSetColumn.pm

diff --git a/lib/DBIx/Class/ResultSetColumn.pm b/lib/DBIx/Class/ResultSetColumn.pm
index 3705d50..e26b6c2 100644 (file)
--- a/lib/DBIx/Class/ResultSetColumn.pm
+++ b/lib/DBIx/Class/ResultSetColumn.pm
@@ -5,6 +5,8 @@ use warnings;
 
 use base 'DBIx::Class';
 use DBIx::Class::Carp;
+use DBIx::Class::_Util 'fail_on_internal_wantarray';
+use namespace::clean;
 
 # not importing first() as it will clash with our own method
 use List::Util ();
@@ -57,7 +59,7 @@ sub new {
   my $as_index = List::Util::first { ($as_list->[$_] || "") eq $column } 0..$#$as_list;
   my $select = defined $as_index ? $select_list->[$as_index] : $column;
 
-  my ($new_parent_rs, $colmap);
+  my $colmap;
   for ($rsrc->columns, $column) {
     if ($_ =~ /^ \Q$alias\E \. ([^\.]+) $ /x) {
       $colmap->{$_} = $1;
@@ -68,6 +70,7 @@ sub new {
     }
   }
 
+  my $new_parent_rs;
   # analyze the order_by, and see if it is done over a function/nonexistentcolumn
   # if this is the case we will need to wrap a subquery since the result of RSC
   # *must* be a single column select
@@ -77,7 +80,7 @@ sub new {
       ( $rsrc->schema->storage->_extract_order_criteria ($orig_attrs->{order_by} ) )
   ) {
     # nuke the prefetch before collapsing to sql
-    my $subq_rs = $rs->search;
+    my $subq_rs = $rs->search_rs;
     $subq_rs->{attrs}{join} = $subq_rs->_merge_joinpref_attr( $subq_rs->{attrs}{join}, delete $subq_rs->{attrs}{prefetch} );
     $new_parent_rs = $subq_rs->as_subselect_rs;
   }
@@ -107,8 +110,11 @@ sub new {
     }
   }
 
-  my $new = bless { _select => $select, _as => $column, _parent_resultset => $new_parent_rs }, $class;
-  return $new;
+  return bless {
+    _select => $select,
+    _as => $column,
+    _parent_resultset => $new_parent_rs
+  }, $class;
 }
 
 =head2 as_query
@@ -400,6 +406,7 @@ sub func {
   my $cursor = $self->func_rs($function)->cursor;
 
   if( wantarray ) {
+    DBIx::Class::_ENV_::ASSERT_NO_INTERNAL_WANTARRAY and my $sog = fail_on_internal_wantarray;
     return map { $_->[ 0 ] } $cursor->all;
   }
 
@@ -468,22 +475,47 @@ sub throw_exception {
 sub _resultset {
   my $self = shift;
 
-  return $self->{_resultset} ||= $self->{_parent_resultset}->search(undef,
-    {
-      select => [$self->{_select}],
-      as => [$self->{_as}]
+  return $self->{_resultset} ||= do {
+
+    my $select = $self->{_select};
+
+    if ($self->{_parent_resultset}{attrs}{distinct}) {
+      my $alias = $self->{_parent_resultset}->current_source_alias;
+      my $rsrc = $self->{_parent_resultset}->result_source;
+      my %cols = map { $_ => 1, "$alias.$_" => 1 } $rsrc->columns;
+
+      unless( $cols{$select} ) {
+        carp_unique(
+          'Use of distinct => 1 while selecting anything other than a column '
+        . 'declared on the primary ResultSource is deprecated (you selected '
+        . "'$self->{_as}') - please supply an explicit group_by instead"
+        );
+
+        # collapse the selector to a literal so that it survives the distinct parse
+        # if it turns out to be an aggregate - at least the user will get a proper exception
+        # instead of silent drop of the group_by altogether
+        $select = \[ $rsrc->storage->sql_maker->_recurse_fields($select) ];
+      }
     }
-  );
-}
 
-1;
+    $self->{_parent_resultset}->search(undef, {
+      columns => { $self->{_as} => $select }
+    });
+  };
+}
 
-=head1 AUTHOR AND CONTRIBUTORS
+=head1 FURTHER QUESTIONS?
 
-See L<AUTHOR|DBIx::Class/AUTHOR> and L<CONTRIBUTORS|DBIx::Class/CONTRIBUTORS> in DBIx::Class
+Check the list of L<additional DBIC resources|DBIx::Class/GETTING HELP/SUPPORT>.
 
-=head1 LICENSE
+=head1 COPYRIGHT AND LICENSE
 
-You may distribute this code under the same terms as Perl itself.
+This module is free software L<copyright|DBIx::Class/COPYRIGHT AND LICENSE>
+by the L<DBIx::Class (DBIC) authors|DBIx::Class/AUTHORS>. You can
+redistribute it and/or modify it under the same terms as the
+L<DBIx::Class library|DBIx::Class/COPYRIGHT AND LICENSE>.
 
 =cut
+
+1;
+