extjs 多维数组支持

1. 使用继承(extend)

var model = Ext.define("Ext.data.reader.SomeModel", {
    extend: 'Ext.data.Model',
    fields: [
        {name: 'name'},
        {name: 'extra.gender'}
    ],
    get: function(field){
        if (field.indexOf('.') !== -1) {
            var parts = field.split('.');
            var value = Ext.data.Model.prototype.get.call(this, parts[0]);

            return Ext.isObject(value) ? value[parts[1]] : undefined;
        }
        return Ext.data.Model.prototype.get.call(this, field);
    }
})

2. 使用映射(mapping)

 {name: 'gender', mapping: 'extra.gender'}

参考：

1. http://stackoverflow.com/questions/8296507/extjs-4-grid-panel-how-to-use-dataindex-of-a-sub-element

2. http://docs.sencha.com/extjs/2.3.0/#!/api/Ext.data.Field-cfg-mapping