Datamapper get_rules on related tables

[eluser]WanWizard[/eluser]
The best and most flexible way to share validation rules between models is to use an extension.

Load it (or autoload it), and make sure the method has a "rule_" prefix, so in this case "rule_format_name".

See http://datamapper.wanwizard.eu/pages/val...stom.Rules