def get_instance(self, data):
        return self.Model.objects.get(external_id=data['external_id'],
                                      county=data['county'])
Parse the given JID.
dataset/ETHPy150Open codefordurham/Durham-Restaurants/eatsmart/locations/durham/api.py/EstablishmentImporter.get_instance--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/google/appengine/api/xmpp/xmpp_service_stub.py/XmppServiceStub._ParseJid