[jifty-devel] Subclassing models

[Stanislav Sinyagin]

another thing that I had to figure out myself:

I need to create several Model classes with similar functionality.
For example, some classes will have a set of properties stored 
in another model, and would implement set_property and get_property methods.

Creating these methods in every model class would be too dirty and prone to errors,
so I subclassed such models from another class where these methods are defined.

The problem is that I can't put such superclass in MyApp::Model namespace, 
because Jifty expects every class in that namespace to be a valid Model class.

I created a new namespace MyApp::ModelAddons for such add-ons to the models.

Probably the core developers would have a better idea of a "canonical" place
for such add-ons?

the code follows:

======================

use strict;
use warnings;

package Toponet::ModelAddons::Properties;



sub _init_properties
{
    my $self = shift;
    my $propContainerClass = shift;

    $self->{'_propertyContainerClass'} = $propContainerClass;
}


sub get_property
{
    my $self = shift;
    my $prop = shift;

    my $propRecord = $self->{'_propertyContainerClass'}->new
        ( current_user => $self->current_user());

    if( $propRecord->load_by_cols( objectID => $self->id(),
                                   property => $prop ) )
    {
        return $propRecord->value();
    }
    
    return undef;
}


sub set_property
{
    my $self = shift;
    my $prop = shift;
    my $value = shift;
    
    my $propRecord = $self->{'_propertyContainerClass'}->new
        ( current_user => $self->current_user());
    
    my( $ok, $msg) = $propRecord->load_by_cols( objectID => $self->id(),
                                                property => $prop );
    if( $ok )
    {
        $propRecord->set_value( $value );
    }
    else
    {
        $propRecord->create( objectID => $self->id(),
                             property => $prop,
                             value => $value );
    }
}


1;

===========================