From: Arthur Axel "fREW" Schmidt <frioux@gmail.com>
Date: Mon, 8 Feb 2010 05:17:43 +0000 (+0000)
Subject: another example of as_subselect_rs
X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=commitdiff_plain;h=bc64456d2ebecc3ed8f8ab7db641ff0af0c7db39;p=dbsrgits%2FDBIx-Class-Historic.git

another example of as_subselect_rs
---

diff --git a/lib/DBIx/Class/ResultSet.pm b/lib/DBIx/Class/ResultSet.pm
index df82fcf..3677225 100644
--- a/lib/DBIx/Class/ResultSet.pm
+++ b/lib/DBIx/Class/ResultSet.pm
@@ -2623,6 +2623,18 @@ it were simply where-filtered without joins).  For example:
  # works as expected: finds a 'table' row related to two x rows (abc and def)
  my $correctly_joined_rs = $rs2->search({'x.name' => 'def'});
 
+Another example of when one might use this would be to select a subset of
+columns in a group by clause:
+
+ my $rs = $schema->resultset('Bar')->search(undef, {
+   group_by => [qw{ id foo_id baz_id }],
+ })->as_subselect_rs->search(undef, {
+   columns => [qw{ id foo_id }]
+ });
+
+In the above example normally columns would have to be equal to the group by,
+but because we isolated the group by into a subselect the above works.
+
 =cut
 
 sub as_subselect_rs {