[Answered ]-Return one field after creation via post-request in django rest framework

1👍

You can set write or read only in extra_kwargs in the Meta class of a serializer.
E.g.

class PurchaseSerializer(serializers.ModelSerializer):
    class Meta:
        model = Purchase
        fields = "__all__"
        extra_kwargs = {
             'field_1': {'write_only': True},
             'field...N': {'write_only': True},
             'id': {'read_only': True}
        }

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