extjs 多维数组支持

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);
}
})

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