DRF CaseInsensitiveSerializer

serializer.py

import copy

from django.http.request import QueryDict
from django.utils.datastructures import CaseInsensitiveMapping
from rest_framework.serializers import empty

class CaseInsensitiveSerializer(serializers.Serializer):
    """
    Serializer which treats parameters names as case-sensitive.
    """
    def __init__(self, instance=None, data=empty, **kwargs) -> None:
        fields = self.get_fields()
        field_names = CaseInsensitiveMapping({field_name: field_name for field_name, field in fields.items()})
        
        if isinstance(data, QueryDict):
            new_data = QueryDict('', mutable=True, encoding=data.encoding)
            for key, value in data.lists():
                key = field_names.get(key, key)
                new_data.setlist(key, copy.deepcopy(value))
        elif data is empty:
            new_data = data
        else:
            # Note: we may loose repeated keys at that moment
            new_data = {field_names[name]: value for name, value in data.items()}

        super().__init__(instance, new_data, **kwargs)