fix bug in operation validation

### What is the problem / feature ?

Fix bug in request/response validation

### How did it get fixed / implemented ?

Removed the attrgetter since a request oblect is now passed into the function.

### How can someone test / see it ?

Code


*Here is a cute animal picture for your troubles...*

![715008-bigthumbnail](https://cloud.githubusercontent.com/assets/824194/5448816/63512ba6-84a5-11e4-8b77-2a360c3dae3c.jpg)