Allow saving object without needing to add foreign key attribute to class Meta field

[AmayaKuro]

PROBLEM:

Hello everyone, I came across django.db.utils.IntegrityError: NOT NULL constraint failed: conversation_id when I try to save an object via Serializer that doesn't contain conversation_id, which is a foreign key to Conversation, in fields variable of class Meta.

models.py

class Conversations(models.Model):
    owner = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE, related_name="conversations")


class Responses(models.Model):
    conversation = models.ForeignKey(Conversations, on_delete=models.CASCADE, related_name="responses")
    log = models.TextField()

serializers.py:

class ResponseSerializer(serializers.ModelSerializer):
    class Meta:
        model = Responses
        fields = ['response_id', 'log']

views.py

            data = {
                "conversation": conversation_id,
                "response_id": response_id,
                "log": log
            }

            serializer = ResponseSerializer(data=data)
            if serializer.is_valid():
               serializer.save()

IDEA:

Is it better to allow user to provide Foreign key for saving object and not specify Foreign key in field variable?
Ex:

class ResponseSerializer(serializers.ModelSerializer):
    class Meta:
        model = Responses
        # Doesn't need to add conversation key
        fields = ['response_id', 'log']

And:

            data = {
                # Still raise error if doesn't provided
                "conversation": conversation_id,
                "response_id": response_id,
                "log", log
            }

            serializer = ResponseSerializer(data=data)

or forcing user to give key in the context:

            data = {
                "response_id": response_id,
                "log": log
            }

            serializer = ResponseSerializer(data=data, context={"conversation": conversation_id})

Using this, user can get rid of some overhead cost or just make JSON prettier.

serializer = ResponseSerializer(data=data)
print(serializer.data)
# No more conversation: 2
# { response_id: "id", log: "This is better" }

Thanks for your attention~

[AmayaKuro]

There seem to be another way that DRF allow us to exactly like that by passing foreign object in save():

            data = {
                # Doesn't need this anymore
                # "conversation": conversation_id,
                "response_id": response_id,
                "log": log
            }

            serializer = ResponseSerializer(data=data)
            if serializer.is_valid():
               #  Syntax:  serializer.save(foreignKeyField = anObjectOfThatForeignModel)
               serializer.save(conversation = conversation_id)