def get_image(self, gateway):
"""Return an image for the given gateway. The API by default looks for
the `get_image` method in the model of the given gateway. If there is
such a method, the value returned from calling that method with the
browse record of the method as argument is taken.
"""
gateway_model_obj = Pool().get(gateway.model.model)
if hasattr(gateway_model_obj, 'get_image'):
return gateway_model_obj.get_image(gateway)
return None
