How django rest framework validate list of object?

Question

I already know that drf has an interface to add a validator to obejct, I have a view that can create multiple Param objects with one request, I want to verify if there are two or more objects whose name and value fields are the same, How can I validate the list of object in serializer?

models.py

class Param(models.Model):
    name = models.CharField(max_length=256)
    value = models.CharField(max_length=256)

    class Meta:
        unique_together = ('name', 'value')

serializers.py

class ParamSerializer(serializers.ModelSerializer):

    class Meta:
        model = models.ParamKey
        fields = ['name', 'value']
        extra_kwargs = {
            'id': {
                'required': False,
            },
            'name': {
                'required': False,
            }
        }

views.py

class ParamViewSet(viewsets.ViewSet):

    def create(self, request):

        serializer = serializer.ParamKeySerializer(
            data=request.data, many=True)
        if serializer.is_valid():
            return Response()
        return Response()

stackoverflow.com/questions/22621060/…

Stephen Rauch
– Stephen Rauch ♦

2019-03-15 04:17:38 +00:00
Commented Mar 15, 2019 at 4:17 — Stephen Rauch
– Stephen Rauch ♦, Commented Mar 15, 2019 at 4:17
can you provide a minimal example of it? @Rhys

JPG
– JPG

2019-03-15 05:05:11 +00:00
Commented Mar 15, 2019 at 5:05 — JPG
– JPG, Commented Mar 15, 2019 at 5:05

Devang Padhiyar · Accepted Answer · 2019-03-15 04:32:14Z

You could use ListSerializer for this kind of functionality.

The ListSerializer class provides the behavior for serializing and validating multiple objects at once. You won't typically need to use ListSerializer directly, but should instead simply pass many=True when instantiating a serializer.

For reference visit https://www.django-rest-framework.org/api-guide/serializers/#listserializer

class ParamListSerializer(serializers.ListSerializer):
    def validate(self, attrs):
        # Here attrs contains list of Params You can validate it here
        pass

    def create(self, validated_data):
        books = [Book(**item) for item in validated_data]
        return Book.objects.bulk_create(books)

class ParamSerializer(serializers.ModelSerializer):

    class Meta:
        model = models.ParamKey
        fields = ['name', 'value']
        list_serializer_class = ParamListSerializer  # This specifies which list serializer class to user
        extra_kwargs = {
            'id': {
                'required': False,
            },
            'name': {
                'required': False,
            }
        }

    def validate(self, attrs):
        # enter your validations here
        pass

Baktiyar Bekbergen · Accepted Answer · 2019-03-15 04:19:55Z

0

Try to do like this, may be it will help

class ParamSerializer(serializers. ModelSerializer):
    class Meta:
        model = Param
        fields = ['name', 'value']
        extra_kwargs = {
            'id': {
                'required': False,
            },
            'name': {
                'required': False,
            }
        }

    def validate(self, attrs):
        # your validatator code here

    def create(self, validated_data):
       paramkeys = validated_data.pop('your_list')
       for p in paramkeys:
           param, _ = Param.objects.get_or_create(name=p.name, value=p.value)

answered Mar 15, 2019 at 4:19

Baktiyar Bekbergen

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1 Comment

Rhys Pang Over a year ago

Can this way validate a list of object？

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