Terrence Brannon

NAME

Data::Hash::Flatten - isomorphic denormalization of nested HoH into AoH

SYNOPSIS

  use Data::Hash::Flatten;

  my $a = { bill => { '5/27/96' => { 'a.dat' => 1, 'b.txt' => 2, 'c.lsp' => 3 } },
            jimm => { '6/22/98' => { 'x.prl' => 9, 'y.pyt' => 8, 'z.tcl' => 7 } } } ;


  my @a = Data::Hash::Flatten->this($a, [qw(name date file)]);
  
  use Data::Dumper;
  print Dumper(\@a);

  $VAR1 = [
          {
            'hits' => 7,
            'date' => '6/22/98',
            'name' => 'jimm',
            'file' => 'z.tcl'
          },
          {
            'hits' => 8,
            'date' => '6/22/98',
            'name' => 'jimm',
            'file' => 'y.pyt'
          },
          {
            'hits' => 9,
            'date' => '6/22/98',
            'name' => 'jimm',
            'file' => 'x.prl'
          },
          {
            'hits' => 3,
            'date' => '5/27/96',
            'name' => 'bill',
            'file' => 'c.lsp'
          },
          {
            'hits' => 2,
            'date' => '5/27/96',
            'name' => 'bill',
            'file' => 'b.txt'
          },
          {
            'hits' => 1,
            'date' => '5/27/96',
            'name' => 'bill',
            'file' => 'a.dat'
          }
        ];

DESCRIPTION

Oftentimes, for searchability, one needs to denormalize a HoH (hash of hash of hash of ...) into an AoH (array of hash). The answer by George_Sherston in this node gives an perfect example of how and why:

  http://perlmonks.org/index.pl?node_id=177346

Hence this module.

EXPORT

None by default.

AUTHOR

T. M. Brannon, <tbone@cpan.org>

SEE ALSO

  "Data Munging with Perl" by Dave Cross