Django run_validation removing MultiValueDict from QueryDict - django

Question

I have a nested serializer field on a serializer which accepts Multipart/form-data (json + images).
The run_validation happens to remove the nested serializer field data from the QueryDict.
Here is the code:
class CreateSerializer(ModelSerializer[Dress]):
dress_sizes = SizeSerializer(many=True, required=False)
def run_validation(self, data: Any = ...) -> Any | None:
return super(CreateSerializer, self).run_validation(data)
def validate(self, data):
return super().validate(data)
The view uses a custom parser:
class MultipartJsonParser(MultiPartParser):
def parse(self, stream, media_type=None, parser_context=None):
result = super().parse(
stream, media_type=media_type, parser_context=parser_context
)
data = {}
for key, value in result.data.items():
if type(value) != str:
data[key] = value
continue
if "{" in value or "[" in value:
try:
data[key] = json.loads(value)
except ValueError:
data[key] = value
else:
data[key] = value
qdict = QueryDict('', mutable=True)
qdict.update(data)
return DataAndFiles(qdict, result.files)
Here is the data that I get in the run_validation method:
< QueryDict: {
'file_name': ['swimsuit.svg'],
'dress_sizes': [
[{
'size': 'xs'
}, {
'size': 's'
}, {
'size': 'm'
}, {
'size': 'l'
}, {
'size': 'xl'
}]
],
'image': [ < TemporaryUploadedFile: swim.svg(image / svg + xml) > ]
} >
After run_validation the validate gets following data:
OrderedDict([('file_name', 'swimsuit.svg'), ('image', <
TemporaryUploadedFile: swim.svg(image / svg + xml) > )])
Here the whole dress_sizes has disappeared. Which is needed to create the list of dress_sizes objects. I have reduced the code to make it readable. Maybe there are some mismatches in the spellings which is not the issue.
Question is how to make the run_validation not remove the list of dress_sizes?
Finally in the create method there is no data for the dress_sizes = []. Here is create:
def create(self, validated_data: Dict[str, Any]) -> Dress:
dress_sizes = validated_data.pop("dress_sizes", [])