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Manual Reference Pages  -  ROSE::DB::OBJECT::MAKEMETHODS::STD (3)

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NAME

Rose::DB::Object::MakeMethods::Std - Create object methods related to Rose::DB::Object::Std-derived objects.

CONTENTS

SYNOPSIS



  package Category;
  our @ISA = qw(Rose::DB::Object::Std);
  ...

  package Color;
  our @ISA = qw(Rose::DB::Object::Std);
  ...

  package Product;
  our @ISA = qw(Rose::DB::Object);
  ...

  use Rose::DB::Object::MakeMethods::Std
  (
    object_by_id =>
    [
      color => { class => Color },

      category =>
      {
        class     => Category,
        id_method => cat_id,
        share_db  => 0,
      },
    ],
  );

  ...

  $prod = Product->new(...);

  $color = $prod->color;

  # $prod->color call is roughly equivalent to:
  #
  # $color = Color->new(id => $prod->color_id,
  #                     db => $prod->db);
  # $ret = $color->load;
  # return $ret  unless($ret);
  # return $color;

  $cat = $prod->category;

  # $prod->category call is roughly equivalent to:
  #
  # $cat = Category->new(id => $prod->cat_id);
  # $ret = $cat->load;
  # return $ret  unless($ret);
  # return $cat;



DESCRIPTION

Rose::DB::Object::MakeMethods::Std creates methods related to Rose::DB::Object::Std-derived objects. It inherits from Rose::Object::MakeMethods. See the Rose::Object::MakeMethods documentation to learn about the interface. The method types provided by this module are described below.

All method types defined by this module are designed to work with objects that are subclasses of (or otherwise conform to the interface of) Rose::DB::Object. In particular, the object is expected to have a db method that returns a Rose::DB-derived object. See the Rose::DB::Object::Std documentation for more details.

METHODS TYPES

<B>object_by_idB> Create a get/set methods for a single Rose::DB::Object::Std-derived object loaded based on a primary key stored in an attribute of the current object.
Options
class The name of the Rose::DB::Object::Std-derived class of the object to be loaded. This option is required.
hash_key The key inside the hash-based object to use for the storage of the object. Defaults to the name of the method.
id_method The name of the method that contains the primary key of the object to be loaded. Defaults to the method name concatenated with _id.
interface Choose the interface. The only current interface is get_set, which is the default.
share_db If true, the db attribute of the current object is shared with the object loaded. Defaults to true.
Interfaces
get_set Creates a method that will attempt to create and load a Rose::DB::Object::Std-derived object based on a primary key stored in an attribute of the current object.

If passed a single argument of undef, the hash_key used to store the object is set to undef. Otherwise, the argument is assumed to be an object of type class and is assigned to hash_key after having its primary key set to the corresponding value in the current object.

If called with no arguments and the hash_key used to store the object is defined, the object is returned. Otherwise, the object is created and loaded.

The load may fail for several reasons. The load will not even be attempted if the primary key attribute in the current object is undefined. Instead, undef will be returned. If the call to the newly created object’s load method returns false, that false value is returned.

If the load succeeds, the object is returned.

Example:



    package Category;
    our @ISA = qw(Rose::DB::Object::Std);
    ...

    package Color;
    our @ISA = qw(Rose::DB::Object::Std);
    ...

    package Product;
    our @ISA = qw(Rose::DB::Object);
    ...

    use Rose::DB::Object::MakeMethods::Std
    (
      object_by_id =>
      [
        color => { class => Color },

        category =>
        {
          class     => Category,
          id_method => cat_id,
          share_db  => 0,
        },
      ],
    );

    ...

    $prod = Product->new(...);

    $color = $prod->color;

    # $prod->color call is roughly equivalent to:
    #
    # $color = Color->new(id => $prod->color_id,
    #                     db => $prod->db);
    # $ret = $color->load;
    # return $ret  unless($ret);
    # return $color;

    $cat = $prod->category;

    # $prod->category call is roughly equivalent to:
    #
    # $cat = Category->new(id => $prod->cat_id);
    # $ret = $cat->load;
    # return $ret  unless($ret);
    # return $cat;



AUTHOR

John C. Siracusa (siracusa@gmail.com)

LICENSE

Copyright (c) 2010 by John C. Siracusa. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
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perl v5.20.3 ROSE::DB::OBJECT::MAKEMETHODS::STD (3) 2015-03-17

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