Django REST Framework problem with serializer.py

Question

I'm trying to save some data like Image and it's info with POST method from Postman. But I got an error: init() got an unexpected keyword argument 'title'. Here is my code:

1.models.py

from django.db import models
class Images(models.Model):
    title = models.CharField(max_length=100)
    description = models.CharField(max_length=100)
    image = models.ImageField()

serializers.py

from rest_framework import serializers
from .models import Images

class ImgSerializer(serializers.ModelSerializer):
    class Meta:
        model = Images
        fields = ["title", "description", "image"]

    def create(self, validated_data):
        return ImgSerializer(**validated_data)

    def update(self, instance, validated_data):
        instance.title = validated_data.get('title', instance.title)
        instance.description = validated_data.get('description', instance.description)
        instance.save()
        return instance

views.py

class ImgApi(APIView):
    parser_classes = (MultiPartParser, FormParser)
    def post(self, request):
        serializer = ImgSerializer(data=request.data)
        if serializer.is_valid():
            try:
                serializer.save()
            except Exception as e:
                logger.error(e)
                return Response(data={'msg':f'{e}'},status=status.HTTP_500_INTERNAL_SERVER_ERROR)
            return Response(data=json_data,
                            status=status.HTTP_201_CREATED)

And things in Postman:

How should I fix this problem?

Toan Nguyen · Accepted Answer · 2021-01-13 09:10:55Z

1

Your problem is from ImgSerializer.create() method:

serializer.save() will call ImgSerializer.create() because the serializer is not initialized with instance keyword.
In serializer create method, ImgSerializer(**validated_data) construct new serializer instance, which will call ModelSerializer.__init__ method. But since you use unpack operator (**validated_data), you actually pass title, description and image keyword args to __init__ method, which are not recognized by the method.

So instead of ImgSerializer(**validated_data), you should use ImgSerializer(data=validated_data).

answered Jan 13, 2021 at 9:10

Toan Nguyen

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