man Class::DBI::Loader::Relationship () - Easier relationship specification in CDBI::L

NAME

Class::DBI::Loader::Relationship - Easier relationship specification in CDBI::L

SYNOPSIS

  use Class::DBI::Loader::Relationship;


  my $loader = Class::DBI::Loader->new( dsn => "mysql:beerdb",
                                        namespace => "BeerDB");

Now instead of saying 

    BeerDB::Brewery->has_many(beers => "BeerDB::Beer");
    BeerDB::Beer->has_a(brewery => "BeerDB::Brewery");


    BeerDB::Handpump->has_a(beer => "BeerDB::Beer"); 
    BeerDB::Handpump->has_a(pub => "BeerDB::Pub");
    BeerDB::Pub->has_many(beers => [ BeerDB::Handpump => 'beer' ]);
    BeerDB::Beer->has_many(pubs => [ BeerDB::Handpump => 'pub' ]);

Just say 

    $loader->relationship( "a brewery produces beers" );
    $loader->relationship( "a pub has beers on handpumps" );

DESCRIPTION

This module acts as a mix-in, adding the CWrelationship method to CWClass::DBI::Loader. Since CWClass::DBI::Loader knows how to map between table names and class names, there ought to be no need to replicate the names.

In addition, it is common (but not universal) to want reverse relationships defined for has-many relationships, and for has-a relationships to be defined for the linkages surrounding a many-to-many table.

The aim of CWCDBIL::Relationship is to simplify the declaration of common database relationships by providing both of these features.

The CWrelationship takes a string. It recognises table names (singular or plural, for convenience) and extracts them from the sentence.

AUTHOR

Simon Cozens, CWsimon@cpan.org

SEE ALSO

Class::DBI::Loader.