How to add a custom validation rule to a model in Sencha Touch

Question

This article by Sencha covers how to use the built in validation rules (presence, length, format, inclusion, exclusion) and mentions that adding custom rules is easy, but do

Answer 1

I've slightly adapted the code from Jason for sencha touch 2 (since validations is now in the config property of the model). I suggest creating a base class from which all your other model classes would inherit. Then, once you've done that, you can use jason's technics for adding custom validations in Ext.data.validations singleton.

Ext.define('MyApp.model.CustomModelBase', {
    extend: 'Ext.data.Model',

    //adding an initializer to let custom validators access "self"
    init : function () {
        var i, len;
        if (this.config.validations) {
            for (i = 0, len = this.config.validations.length; i < len; i++) {
                this.config.validations[i].self = this;
            }
        }
    }
});