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.\" ========================================================================
.\"
.IX Title "KiokuDB::Role::Upgrade::Data 3pm"
.TH KiokuDB::Role::Upgrade::Data 3pm "2014-03-25" "perl v5.18.2" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.SH "NAME"
KiokuDB::Role::Upgrade::Data \- Classes that provide their own upgrade routine.
.SH "VERSION"
.IX Header "VERSION"
version 0.57
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&    with qw(KiokuDB::Role::Upgrade::Data);
\&
\&    sub kiokudb_upgrade_data {
\&        my ( $class, %args ) = @_;
\&
\&        # convert the data from the old version of the class to the new version
\&        # as necessary
\&
\&        $args{entry}\->derive(
\&            class_version => our $VERSION,
\&            ...
\&        );
\&    }
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This class allows you to take control the data conversion process completely
(there is only one handler per class, not one handler per version with this
approach).
.PP
See KiokuDB::Role::Upgrade::Handlers::Table for a more \s-1DWIM\s0 approach, and
KiokuDB::TypeMap::Entry::MOP for more details.
.SH "AUTHOR"
.IX Header "AUTHOR"
Yuval Kogman <nothingmuch@woobling.org>
.SH "COPYRIGHT AND LICENSE"
.IX Header "COPYRIGHT AND LICENSE"
This software is copyright (c) 2014 by Yuval Kogman, Infinity Interactive.
.PP
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.