CODEWITHSUNDEEP
pythondjangoserializationdjango-rest-framework
DataDude
DataDude

Reputation: 69

Double-nested serializers with Django Rest Framework

Is this possible with DRF using ModelSerializers? I'm mostly interested in seeing an example to reproduce if possible.

Here are my models:

class Grandparent(Model):
    g_name = CharField(max_length=10)
    parent = ForeignKey('Parent')

class Parent(Model):
    p_name = CharField(max_length=10)
    child = ForeignKey('Child')

class Child(Model):
    c_name = CharField(max_length=10)

Here are my serializers:

class ChildSerializer(serializers.ModelSerializer):
    class Meta:
        model = models.Child
        fields = ('id', 'c_name')

class ParentSerializer(serializers.ModelSerializer):
    child = ChildSerializer()

    def create(self, validated_data):
        child_data = validated_data.pop('child')
        child, _ = models.Child.objects.get_or_create(**child_data)
        return models.Parent.objects.create(child=child, **validated_data)

    class Meta:
        model = models.Parent
        fields = ('id', 'p_name', 'child')

class GrandparentSerializer(serializers.ModelSerializer):
    parent = ParentSerializer()

    class Meta:
        model = models.Grandparent
        fields = ('id', 'g_name', 'parent')

Here is my grandparent view:

class GrandparentList(generics.ListCreateAPIView):
    queryset = models.Grandparent.objects.all()
    serializer_class = serializers.GrandparentSerializer

Here is the error I get when I try to post to the Grandparent view:

AttributeError at /grandparents/ 'list' object has no attribute 'get'

Upvotes: 1

Views: 1418

Answers (1)

DataDude
DataDude

Reputation: 69

Issue we found was that is a bug in the form front-end provided by DRF. Nested serializer behaved correctly when called directly over HTTP.

Upvotes: 1

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