ImageField returns Null with DRF

[jcodebrain]

I am using DRF v3 and mongoengine.
In my Mongodb, image field has been well inserted like ("image_file" : ObjectId("57ff54681d41c8bf44ddc047")
However, when I use the DocumentSerializer of DRF, it returns "image_file": null.
I uploaded this issue on the DRF mongoengine forum.

Looks like mongoengine's ImageField doens't go well with DRF mongoengine's ImageField.
I don't know which one is problem.

This is the source code.

from rest_framework_mongoengine.serializers import DocumentSerializer
from ..models import *

class Detail_computer_Serializer(DocumentSerializer):
    class Meta:
        model = Item_Detail

from django_mongoengine import Document, EmbeddedDocument

class ItemDetail(Document):
    image_file = ImageField()

in Django view.py
def image_upload(request):
    item.image_file = request.FILES['image_file']
    ....

[jcodebrain]

Same Issue : #847

[jcodebrain]

same issue here