What happens to the model after the serializer fills in all the necessary fields?

After the serializer fills in all the required model fields, data validation and object saving to the database usually occur.

Process:

1. The serializer checks the correctness and completeness of the data.
2. If the data is valid, an instance of the model is created or updated.
3. The save() method is called, which saves the object to the database.

Example in Django REST Framework:

serializer = MyModelSerializer(data=request.data)
if serializer.is_valid():
    instance = serializer.save()  # the model is saved to the database