Django 2.1：图片上传表单代码未显示错误-图片未保存

Question

1）在models.py中：

class SeekerProfile(models.Model):

user = models.OneToOneField(User, on_delete=models.CASCADE)

#other fields

photo = models.ImageField(upload_to='images/', null=True, blank=True)

2）在views.py

中

@login_required
 def handle_uploaded_file(f):
     with open('some/file/name.txt', 'wb+') as destination:
          for chunk in f.chunks():
              destination.write(chunk)

@login_required

def seeker_profile_update     （request，template_name ='munichlivingapp / seeker_myprofile_edit.html'）：

    logged_in_type = "Seeker"

    u = User.objects.get(username=request.user)

    seeker_obj = SeekerProfile.objects.get(user=u)        

    usereditform = UserEditForm(request.POST or None, instance=u)

    seekerprofileeditform = SeekerProfileEditForm(request.POST or None, request.FILES or None, instance=u.seekerprofile)

    if request.method == 'POST':

        if  usereditform.is_valid():

            user = usereditform.save()

            seekerprofileeditform_aux = SeekerProfileEditForm(data=request.POST, files=request.FILES)

            if  seekerprofileeditform_aux.is_valid() and 'photo' in request.FILES:

                seeker_obj.photo.delete()

                seeker_obj.save()

            if  seekerprofileeditform.is_valid():

                if 'photo' in request.FILES:

                      handle_uploaded_file(seeker_obj.photo)

                      seeker_obj.save()

            return redirect('seeker_myprofile')


    else:

      return render(request, template_name, {'usereditform': usereditform, 'seekerprofileeditform': seekerprofileeditform, 'logged_in_type': logged_in_type }) 

上面的代码有效，该模板呈现无错误。由于某些原因，图像文件永远不会保存。