[Answered ]-How to POST an entity specifiying an integer foreign key in django rest framework

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Because you’ve overridden the user field and set it to read_only=True, you cannot set a user when you’re creating/updating a model.

If you just need the user’s username, I’d suggest you to add a username field into MessageSerializer directly instead:

class MessageSerializer(serializers.ModelSerializer):
    username = serializers.CharField(source='user.username', read_only=True)

    class Meta:
        model = Message
        fields = '__all__'

Now you’ll get this payload instead:

{
  "id": 1,
  "user": 1,
  "username": "timi",
  ...

And you should be able to set a user id now.

👤Preeti Y.

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