NAME

DBIx::Class::ResultSet::Void - improve DBIx::Class::ResultSet with void context

VERSION

version 0.07

SYNOPSIS

my $rs = $schema->resultset('CD');
$rs->find_or_create( {
    artist => 'Massive Attack',
    title  => 'Mezzanine',
} );

As ResultSet subclass in Schema.pm:

__PACKAGE__->load_namespaces(
    default_resultset_class => '+DBIx::Class::ResultSet::Void'
);

Or in Schema/CD.pm

__PACKAGE__->resultset_class('DBIx::Class::ResultSet::Void');

Or in ResultSet/CD.pm

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

DESCRIPTION

The API is the same as DBIx::Class::ResultSet.

use exists instead of find unless defined wantarray.

(Thank ribasushi to tell me count is bad)

METHODS

• exists

  $rs->exists( { id => 1 } );

  It works like:

  $rs->search( { id => 1 }, { rows => 1, select => [1] } )->single;

  It is a little faster than count if you don't care the real count.

• find_or_create

  "find_or_create" in DBIx::Class::ResultSet:

  $rs->find_or_create( { id => 1, name => 'A' } );

  produces SQLs like:

  # SELECT me.id, me.name FROM item me WHERE ( me.id = ? ): '1'
  # INSERT INTO item ( id, name) VALUES ( ?, ? ): '1', 'A'

  but indeed SELECT 1 ... LIMIT 1 is performing a little better than me.id, me.name

  this module DBIx::Class::ResultSet::Void produces SQLs like:

  # SELECT 1 FROM item me WHERE ( me.id = ? ) LIMIT 1: '1'
  # INSERT INTO item ( id, name) VALUES ( ?, ? ): '1', 'A'

  we would delegate it DBIx::Class::ResultSet under context like:

  my $row = $rs->find_or_create( { id => 1, name => 'A' } );

• update_or_create

  "update_or_create" in DBIx::Class::ResultSet:

  $rs->update_or_create( { id => 1, name => 'B' } );

  produces SQLs like:

  # SELECT me.id, me.name FROM item me WHERE ( me.id = ? ): '1'
  # UPDATE item SET name = ? WHERE ( id = ? ): 'B', '1'

  this module:

  # SELECT 1 FROM item me WHERE ( me.id = ? ) LIMIT 1: '1'
  # UPDATE item SET name = ? WHERE ( id = ? ): 'B', '1'

AUTHOR

Fayland Lam <fayland@gmail.com>

COPYRIGHT AND LICENSE

This software is copyright (c) 2017 by Fayland Lam.

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