Dynamic fields and validation in model

[neoraptor]

Hello,

I would like to build a model from data coming from server. Is it possible to do it?

My objective is to add new fields and validations to an existing model.

Examples: current model:

Ext.define('MyApp.model.userModel', {
    extend: 'Ext.data.Model',
    xtype: 'userModel',
	
    config: {
        fields: [
			{ name: 'name', type: 'string' },
			{ name: 'age', type: 'int'}, 
        ],
		validations: [
			{type: 'presence', field: 'name'},
			{type: 'presence', field: 'age'},
		]
    }
});

For the moment, I managed to retrieve the model using the model manager (Ext.ModelManager.getModel('MyApp.model.userModel'), but I can't access its properties (fields and validations items).
How could I do that?

Thank you for your answers

[neoraptor]

I tried various methods without success :
* There is no activate events where I can define it dynamically
* I tried to build a model dynamically and attached it to the store

Is it possible to do it? What am I missing?

Thank you for your support

[neoraptor]

Small update : I found this method to work :

// get Model
var myModel = Ext.ModelManager.getModel('PhoneGap.model.patientModel');
// Retrieve newFields dynamically
var newFields = [];
newFields = eval(store.getCustomFields());
// Add each of the new field in the model
for (var i = newFields.length - 1; i >= 0; i--){
	 myModel.prototype.fields.add(new Ext.data.Field(newFields[i]));
};

Hope it can help someone