NAME

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

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

       object_by_id
           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.