Exception handling and nested serializer with many=True

[kitqee]

There are the following serializers:

class ItemSerializer(serializers.Serializer):
    id = serializers.IntegerField()
    count = serializers.DecimalField(max_digits=12, decimal_places=2)
    is_removed = serializers.BooleanField()


class DocumentSerializer(serializers.Serializer):
    comment = serializers.CharField()
    items = ItemSerializer(many=True, required=True, allow_empty=False)

Or

class DocumentSerializer(serializers.Serializer):
    comment = serializers.CharField()
    items = inline_serializer(many=True, fields={
        'id': serializers.IntegerField(),
        'count': serializers.DecimalField(max_digits=12, decimal_places=2),
        'is_removed': serializers.BooleanField()
    })

I expected the following error formatting on an invalid request:

{
    "errors": [
        {
            "message": "This field is required.",
            "code": "required",
            "field": "items.0.is_removed"
        },
        {
            "message": "This field is required.",
            "code": "required",
            "field": "items.1.is_removed"
        }
    ]
}

But I got:

{
    "errors": [
        {
            "is_removed": [
                {
                    "message": "This field is required.",
                    "code": "required"
                }
            ],
            "field": "items"
        },
        {
            "is_removed": [
                {
                    "message": "This field is required.",
                    "code": "required"
                }
            ],
            "field": "items"
        }
    ]
}

What's wrong? thanks

[Ventsislav Tashev]

Hi, @aesfur !

Your serializers' structure looks valid, but it seems that you're not using the ErrorsFormatter, documented in the Error formatting section.

This, combined with the mechanism explained in the API exception handling section is the solution of your problem.

Cheers! 🙌

[kitqee]

@wencakisa Hi!

I use the formatter from example.
But the examples above are not formatted correctly

Only this works as expected:
items = serializers.ListField(child=ItemSerializer())