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|
package DBIx::Class::Helper::Row::StorageValues;
{
$DBIx::Class::Helper::Row::StorageValues::VERSION = '2.013002';
}
use strict;
use warnings;
# ABSTRACT: Keep track of stored vs in-memory row values
use parent 'DBIx::Class';
__PACKAGE__->mk_group_accessors(inherited => '_storage_value_columns');
__PACKAGE__->mk_group_accessors(inherited => '_storage_values');
sub _has_storage_value { $_[0]->column_info($_[1])->{keep_storage_value} }
sub storage_value_columns {
my $self = shift;
if (!$self->_storage_value_columns) {
$self->_storage_value_columns([
grep $self->_has_storage_value($_),
$self->result_source->columns
]);
}
return $self->_storage_value_columns;
}
sub store_storage_values {
my $self = shift;
$self->_storage_values({
map {
my $acc = ($self->column_info($_)->{accessor} || $_);
$_ => $self->$acc
} @{$self->storage_value_columns}
});
$self->_storage_values;
}
sub get_storage_value { $_[0]->_storage_values->{$_[1]} }
sub new {
my $class = shift;
my $ret = $class->next::method(@_);
$ret->store_storage_values;
$ret;
}
sub inflate_result {
my $class = shift;
my $ret = $class->next::method(@_);
$ret->store_storage_values;
$ret;
}
sub insert {
my $self = shift;
my $ret = $self->next::method(@_);
$ret->store_storage_values;
$ret;
}
sub update {
my $self = shift;
my $ret = $self->next::method(@_);
$ret->store_storage_values;
$ret;
}
1;
__END__
=pod
=head1 NAME
DBIx::Class::Helper::Row::StorageValues - Keep track of stored vs in-memory row values
=head1 VERSION
version 2.013002
=head1 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;
=head1 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 C<update>, the C<storage_value>
will be different; once C<update> is called the C<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 L<DBIx::Class::FilterColumn> or
L<DBIx::Class::InflateColumn> it will get the non-storage or inflated values,
respectively.
=head1 METHODS
=head2 _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';
}
=head2 storage_value_columns
$self->storage_value_columns
returns a list of columns to store
=head2 get_storage_value
$self->get_storage_value('colname')
returns the value for that column which is in storage
=head1 AUTHOR
Arthur Axel "fREW" Schmidt <frioux+cpan@gmail.com>
=head1 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.
=cut
|
