def get_value_as_string(self, model):
        value = self.get_value(model)
        if(self.empty(value)):
            return EMPTY_VALUE
        return self.value_to_string(value)
Returns the value for this property from the given model instance
dataset/ETHPy150Open jahlborn/appengine-rest-server/src/main/python/rest/__init__.py/PropertyHandler.get_value_as_string