/ 
DBIx-Class-ResultSet-WithMetaData-1.000001
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/ DBIx::Class::ResultSet::WithMetaData

VERSION

Version 1.000001

NAME

DBIx::Class::ResultSet::WithMetaData

SYNOPSIS

package MyApp::Schema::ResultSet::ObjectType;

use Moose;
use MooseX::Method::Signatures;
extends 'DBIx::Class::ResultSet::WithMetaData;

method with_substr () {
  return $self->_with_meta_key( 
    substr => sub {
      return substr(shift->{name}, 0, 3);
    }
  );
}

...


# then somewhere else

my $object_type_arrayref = $object_type_rs->with_substr->display();

# [{
#    'artistid' => '1',
#    'name' => 'Caterwauler McCrae',
#    'substr' => 'Cat'
#  },
#  {
#    'artistid' => '2',
#    'name' => 'Random Boy Band',
#    'substr' => 'Ran'
#  },
#  {
#    'artistid' => '3',
#    'name' => 'We Are Goth',
#    'substr' => 'We '
#  }]

DESCRIPTION

Attach metadata to rows by chaining ResultSet methods together. When the ResultSet is flattened to an ArrayRef the attached metadata is merged with the row hashes to give a combined 'hash-plus-other-stuff' representation.

METHODS

display

Arguments: none
Return Value: ArrayRef
$arrayref_of_row_hashrefs = $rs->display();

This method uses DBIx::Class::ResultClass::HashRefInflator to convert all rows in the ResultSet to HashRefs. These are then merged with any metadata that had been attached to the rows using "add_row_info".

_with_meta_key

Arguments: key_name => subref($row_hash)
Return Value: ResultSet
$self->_with_meta_key( substr => sub ($row) { 
  return substr(shift->{name}, 0, 3);
});

This method allows you populate a certain key for each row hash at "display" time.

_with_meta_hash

Arguments: subref($row_hash)
Return Value: ResultSet
$self->_with_meta_hash( sub ($row) { 
  my $row = shift;
  my $return_hash = { substr => substr($row->{name}, 0, 3), substr2 => substr($row->{name}, 0, 4) };
  return $return_hash;
});

Use this method when you want to populate multiple keys of the hash at the same time. If you just want to populate one key, use "_with_meta_key".

add_row_info (DEPRECATED)

Arguments: row => DBIx::Class::Row object, info => HashRef to attach to the row
Return Value: ResultSet
$rs = $rs->add_row_info(row => $row, info => { dates => [qw/mon weds fri/] } );

DEPRECATED - this method is quite slow as it requires that you iterate through the resultset each time you want to add metadata. Replaced by "build_metadata".

AUTHOR

Luke Saunders <luke.saunders@gmail.com>

THANKS

As usual, thanks to Matt S Trout for the sanity check.

LICENSE

This library is free software under the same license as perl itself