retrieve model instance from database without model instance

How do I retrieve a model instance from the database without a model
instance?

For example from the doc[1] it has:
product = Product.objects.get(name='Venezuelan Beaver Cheese')

I want something like getInstance( 'Product', 'Venezuelan Beaver
Cheese' )

Here are the details of what I'm doing. I have multiple form models
that are all handled by the same post processing class. I'm using
django-celery to do the processing.

I want to do something like this in my view:
dbSave = form.save()
processTask.delay('Product', dbSave.pk)

Then in the task:
class processTask(Task):
def run(self, modelName, pk):
instance = getInstance( modelName, pk )
….

From what I've read about django-celery, I shouldn't pass class
instances to the task so I need a way to pass/retrieve this info via
basic datatypes.

Brian

[1] https://docs.djangoproject.com/en/dev/ref/models/instances/#updating-attributes-based-on-existing-fields

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