man DBIx::Class::Helper::Row::StorageValues (3): Keep track of stored vs in-memory row values

SYNOPSIS

package MyApp::Schema::Result::BlogPost;
use parent 'DBIx::Class::Core';
__PACKAGE__->load_components(qw(Helper::Row::StorageValues));
__PACKAGE__->table('BlogPost');
__PACKAGE__->add_columns(
id => {
data_type => 'integer',
is_auto_increment => 1,
},
title => {
data_type => 'varchar',
length => 32,
keep_storage_value => 1,
},
body => {
data_type => 'text',
},
);
1;
# elsewhere:
my $post = $blog_rs->create({
title => 'Components for fun and profit',
body => '...',
});
$post->title('Components for fun');
warn sprintf 'Changing title from %s to %s',
$post->storage_value('title'), $post->title;
$post->update;

DESCRIPTION

This component keeps track of the value for a given column in the database. If you change the column's value and do not call "update", the "storage_value" will be different; once "update" is called the "storage_value" will be set to the value of the accessor. Note that the fact that it uses the accessor is an important distinction. If you are using DBIx::Class::FilterColumn or DBIx::Class::InflateColumn it will get the non-storage or inflated values, respectively.

METHODS

_has_storage_value

 $self->_has_storage_value('colname')

returns true if we should store the storage value from the database. Override this if you'd like to enable storage on all integers or something like that:

 sub _has_storage_value {
    my ( $self, $column ) = @_;
    my $info = $self->column_info($column);
    return defined $info->{data_type} && $info->{data_type} eq 'integer';
 }

storage_value_columns

 $self->storage_value_columns

returns a list of columns to store

get_storage_value

 $self->get_storage_value('colname')

returns the value for that column which is in storage

AUTHOR

Arthur Axel ``fREW'' Schmidt <[email protected]>

COPYRIGHT AND LICENSE

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