Django rest framework. Returns nested multiple models

tomoc4

I'm trying to create a combined viewset that displays data in a nested format of three nested models.

I got an error when trying to return to the viewset.

Got AttributeError when attempting to get a value for field `runner` on serializer `CombinedSerializer`. The serializer field might be named incorrectly and not match any attribute or key on the `Runner` instance. Original exception text was: 'Runner' object has no attribute 'runner'.

serializers.py

class CombinedSerializer(serializers.Serializer):
    event = EventSerializer()
    market = MarketSerializer()
    runner = RunnerSerializer()
    class Meta:
        fields = ('event' , 'market', 'runner')

views.py

class CombinedViewSet(mixins.ListModelMixin, 
                      viewsets.GenericViewSet, 
                     mixins.RetrieveModelMixin):

    queryset = Runner.objects.all()
    serializer_class = CombinedSerializer

models.py

class Event(models.Model):
    sport_id = models.CharField(max_length=15)
    event_id = models.BigIntegerField(unique=True)
    event_name = models.CharField(max_length=200)
    start_time = models.DateTimeField(null=True)
    status = models.CharField(max_length=13)


class Market(models.Model):
    event = models.ForeignKey(Event, on_delete=models.CASCADE)
    market_id = models.BigIntegerField(unique=True)
    market_name = models.CharField(max_length=35)
    status = models.CharField(max_length=10)
    volume = models.FloatField(null=True)

class Runner(models.Model):
    event = models.ForeignKey(Event, null=True, default=None, on_delete=models.CASCADE)
    market = models.ForeignKey(Market, null=True, default=None, on_delete=models.CASCADE)
    runner_id = models.BigIntegerField(unique=True)
    name = models.CharField(max_length=500)
    back_odds = models.FloatField(null=True)
    lay_odds = models.FloatField(null=True)

For some reason, when I remove the runner from the serializer "events and markets" display in the api in nested format. When I add the Runner, I get the above error. How can I fix this and show all three in my API?

heme

Examples quesrysetinclude ViewSet: _Runner

queryset = Runner.objects.all()

But in it, CombinedSerializeryou've included the runnerfields (mapped to RunnerSerailizer) - you've already got a Runnermodel instance, so runnerthere are no fields there, only the fields available in the Runnermodel , any reverse-related fields, and you add on the serializer of custom fields.

You have two options:

Inherit ModelSerializerand include all fields:

class CombinedSerializer(serializers.ModelSerializer):
    event = EventSerializer()
    market = MarketSerializer()

    class Meta:
        model = Runner
        fields = '__all__'

Or, if you want more fine-grained control over the field, mention the field explicitly ( Serializerin which case you can keep the inheritance), eg:

class CombinedSerializer(serializers.Serializer):
    event = EventSerializer()
    market = MarketSerializer()

    class Meta:
        fields = ('event', 'market', 'name', 'back_odds')

If you want to inherit from serializers.ModelSerializer, you need to mention the model in the Metaclass :

class CombinedSerializer(serializers.ModelSerializer):
    event = EventSerializer()
    market = MarketSerializer()

    class Meta:
        model = Runner
        fields = ('event', 'market', 'name', 'back_odds')

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