oh, and the advantage is that you could have a car, for example
car = Car.objects.get(name="4x4")
car.parts.get(name="Transmission").partsincar.amount >> 2
The difference with doing it with another model is that you cannot do
this, for example (or not as easily)
Car.objects.filter(parts__name="Transmission", partsincar__amount=1)
>> Motorcycle + Car
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