[Fixed]-Django Rest Framework how to save a model with Related Field based on ID

by

3👍

✅

Django REST Framework provides a PrimaryKeyRelatedField for exactly this use case.

class RecordSerializer(serializers.ModelSerializer):
    activity = serializers.PrimaryKeyRelatedField()
    owner = serializers.CharField(read_only=True, source='owner.username')
    time_start = serializers.DateTimeField(source='now')

    class Meta:
        model = Records
        fields = ("owner", "activity", "time_start")

This will produce output similar to what you are looking for, and it will accept the id of the activity when you want to update it.

👤Kevin Brown-Silva

32👍

The accepted answer was true for DRF v2.x but is no longer for newer (3.x) versions, as it would raise this AssertionError:

AssertionError: Relational field must provide a queryset argument, or set read_only=True.

For newer versions, just add the queryset argument to it:

class RecordSerializer(serializers.ModelSerializer):
    activity = serializers.PrimaryKeyRelatedField(queryset=Activity.objects.all())
    // [...]
👤mathielo

Leave a comment