add_record¶
Overrides add_record to ensure uniqueness.
NAME¶
Jifty::DBI::Collection::Unique - Ensure uniqueness of records in a collection
SYNOPSIS¶
package Foo::Collection;
use base 'Jifty::DBI::Collection';
use Jifty::DBI::Collection::Unique; # mixin
my $collection = Foo::Collection->New();
$collection->SetupComplicatedJoins;
$collection->OrderByMagic;
while (my $thing = $collection->Next) {
# $thing is going to be distinct
}
DESCRIPTION¶
Currently, Jifty::DBI makes exceptions for databases which cannot handle both
"SELECT DISTINCT" and ordering in the same statement; it drops the
"DISTINCT" requirement. This, of course, means that you can get the
same row twice, which you might not want. If that's the case, use this module
as a mix-in, and it will provide you with an "AddRecord" method
which ensures that a record will not appear twice in the same search.
AUTHOR¶
Simon Cozens.
COPYRIGHT¶
Copyright 2005 Best Practical Solutions, LLC
This library is free software; you can redistribute it and/or modify it under
the same terms as Perl itself.