serialization - drf Base64ImageField not accepting None value -

here serializer as:

class questionserializer(serializers.modelserializer):     choices = choiceserializer(many=true)     image = base64imagefield(required=false)      class meta:         model = question         fields = ('id', 'detail', 'image', 'true_false_answer', 'type', 'choices') 

base64imagefield described follow:

from django.core.files.base import contentfile rest_framework import serializers rest_framework.fields import skipfield   class base64fieldmixin(object):     def _decode(self, data):         if data.get('filearray'):             data = data.get('dataurl')         else:             data = none         if isinstance(data, str) , data.startswith('data:'):             # base64 encoded file - decode             format, datastr = data.split(';base64,')  # format ~= data:image/x,             ext = format.split('/')[-1]  # guess file extension              data = contentfile(                base64.b64decode(datastr),                name='{}.{}'.format(uuid.uuid4(), ext)             )          elif isinstance(data, str) , data.startswith('http'):             raise skipfield()          return data      def to_internal_value(self, data):         data = self._decode(data)         return super(base64fieldmixin, self).to_internal_value(data)   class base64imagefield(base64fieldmixin, serializers.imagefield):     pass 

when pass image field with:

{     'filearray' = [] } 

i errors this:

image: ["the submitted data not file. check encoding type on form."] 

but works when image data is:

{     'filearray': [<list of file information>],     'baseurl: '<base64 decoded string>' } 

what have misunderstood here? :)