dbix::class::helper::resultset::random(3pm) [debian man page]

DBIx::Class::Helper::ResultSet::Random(3pm)		User Contributed Perl Documentation	       DBIx::Class::Helper::ResultSet::Random(3pm)

NAME

       DBIx::Class::Helper::ResultSet::Random - Get random rows from a ResultSet

VERSION

       version 2.013002

SYNOPSIS

	# note that this is normally a component for a ResultSet
	package MySchema::ResultSet::Bar;

	use strict;
	use warnings;

	use parent 'DBIx::Class::ResultSet';

	__PACKAGE__->load_components('Helper::ResultSet::Random');

	# in code using resultset:
	my $random_row	= $schema->resultset('Bar')->rand->single;

DESCRIPTION

       This component allows convenient selection of random rows.  See "NOTE" in DBIx::Class::Helper::ResultSet for a nice way to apply it to your
       entire schema.

       Currently this works by doing something akin to

	SELECT TOP($x) from $table ORDER BY RANDOM()

       Lots of people think this is slow.  My own benchmarks show that doing the above, for 10 rows in a table with just over 8 million rows, is
       nearly instant.	Although that was with SQL Server, and different databases will handle that differently.

       So please, if you have performance issues and want this to work with your database, get in touch and I will do what I can to get it to work
       quickly enough to suite your needs.

METHODS

   rand
       This method takes a single argument, being the size of the random ResultSet to return.  It defaults to 1.  This Component will throw
       exceptions if the argument is not an integer or not greater than zero.

   _rand_order_by
       This module currently does an "ORDER BY" on some db specific function.  If for some reason it guesses incorrectly for your database the
       easiest way to fix that in the short-term (ie without patching upstream) is to override this method.  So for example, if your db uses
       "RAND()" instead of "RANDOM()" and it's not in the predefined list of dbs you could just do the following in your ResultSet class:

	sub _rand_order_by { 'RAND()' }

AUTHOR

       Arthur Axel "fREW" Schmidt <frioux+cpan@gmail.com>

COPYRIGHT AND LICENSE

       This software is copyright (c) 2012 by Arthur Axel "fREW" Schmidt.

       This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

perl v5.14.2							    2012-06-18			       DBIx::Class::Helper::ResultSet::Random(3pm)

DBIx::Class::Helper::Row::ProxyResultSetMethod(3pm)	User Contributed Perl Documentation    DBIx::Class::Helper::Row::ProxyResultSetMethod(3pm)

NAME

       DBIx::Class::Helper::Row::ProxyResultSetMethod - Efficiently reuse ResultSet methods from results

VERSION

       version 2.013002

SYNOPSIS

       ResultSet:

	package MyApp::Schema::ResultSet::Foo;

	use base 'DBIx::Class::ResultSet';

	__PACKAGE__->load_components(qw(
	   Helper::ResultSet::CorrelateRelationship
	));

	...;

	sub with_friend_count {
	   shift->search(undef, {
	      '+columns' => {
		 'friend_count' => $self->correlate('friends')->count_rs->as_query,
	      },
	   })
	}

       Result:

	package MyApp::Schema::Result::Foo;

	use base 'DBIx::Class::Core';

	__PACKAGE__->load_components(qw( Helper::Row::ProxyResultSetMethod ));

	__PACKAGE__->proxy_resultset_method('friend_count');

       or with DBIx::Class::Candy:

	package MyApp::Schema::Result::Foo;

	use DBIx::Class::Candy -components => ['Helper::Row::ProxyResultSetMethod'];

	proxy_resultset_method 'friend_count';

       Elsewhere:

	my $row = $foo_rs->first;
	say $row->friend_count . ' friends';

DESCRIPTION

       This module makes reusing resultset methods from a result trivially easy.  You should be using it.

METHODS

   proxy_resultset_method
	__PACKAGE__->proxy_resultset_method( $name => {
	   slot 	    => $slot,
	   resultset_method => $rs_method
	});

       "proxy_resultset_method"'s first argument is the name of the method to generate and is required.  The other two arguments, $slot, and
       $resultset_method are optional.	If unspecified $slot will default to $name and $resultset_method will default to "with_$name".	$slot is
       the column that the data being retrieved is stored as in the ResultSet method being proxied to.	$resultset_method is (duh) the ResultSet
       method being proxied to.

CANDY EXPORTS

       If used in conjunction with DBIx::Class::Candy this component will export:

       proxy_resultset_method

DEDICATION

       This module is dedicated to Ray Bradbury, who wrote Something Wicked This Way Comes, Dandelion Wine, and numerous short stories, plays, etc
       etc.  Read this author's books.

AUTHOR

       Arthur Axel "fREW" Schmidt <frioux+cpan@gmail.com>

COPYRIGHT AND LICENSE

       This software is copyright (c) 2012 by Arthur Axel "fREW" Schmidt.

       This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.

perl v5.14.2							    2012-06-18		       DBIx::Class::Helper::Row::ProxyResultSetMethod(3pm)