ExtJs 4.1: Read complex json with hasOne association

Result

Do you know?

Js Code

Ext.define('User', {
    extend: 'Ext.data.Model',
    fields: ['id', 'name'],
    associations: [{ type: 'hasOne', model: 'Status', associationKey: 'status'}]
});

Ext.define('Status', {
    extend: 'Ext.data.Model',
    fields: [
        { name: 'id', type: 'int' },
        { name: 'title', type: 'string', mapping: 'st_title' }
    ]
});

Ext.onReady(function () {
    var store = Ext.create('Ext.data.ArrayStore', {
        model: 'User',
        data: [
            { id: '1', name: 'user-1', status: { id: 2, st_title: 'disabled'} },
            { id: '2', name: 'user-2', status: { id: 1, st_title: 'active'} },
            { id: '3', name: 'user-3', status: { id: 3, st_title: 'deleted'} },
            { id: '4', name: 'user-4', status: { id: 1, st_title: 'active'} },
            { id: '5', name: 'user-5', status: { id: 3, st_title: 'deleted'} }
        ],
        proxy: {
            type: 'memory',
            reader: {
                type: 'json'
            }
        }
    });

    Ext.widget({
        xtype: 'grid',
        title: 'Users',
        width: 400,
        height: 180,
        store: store,
        renderTo: 'output',
        columns: [
                { text: 'id', dataIndex: 'id' },
                { text: 'name', dataIndex: 'name' },
                {
                    text: 'status',
                    renderer: function (v, m, r) {
                        return r.getStatus().get('title');
                    }
                }
            ]
    });
});