var prefix = this.service.serviceName + '/';
if(!item._id){// generate a good random iditem._id = prefix + Math.random().toString(16).substring(2,14)+Math.random().toString(16).substring(2,14);
}if(item._id.substring(0,prefix.length)!= prefix){throwError("Identity attribute not found");
}returnitem._id.substring(prefix.length);