save cropped image with PIL to database

hello

i have a question and i cant find answer with search.

i want to save cropped image in database then :

this is my model:

class Photo(models.Model):
    file        = models.ImageField(upload_to='%Y/%m/%d', blank=True,null=True)

i have a form then user can select image and send to view like this:

<form method="post" enctype="multipart/form-data" " >
    {% csrf_token %}

  <input type="file"  id="photo_id" name="file">

    <input type="submit" value=" send image" />

  </form>

and in the view i have this :

from PIL import Image


def save_photo(request):

    _photo, created = models.Photo.objects.get_or_create(pk=1)

    if request.method == 'POST':
        photo = request.FILES.get('file')

        image = Image.open(photo)

        cropped_image = image.crop((100, 100, 200, 200))
        resized_image = cropped_image.resize((200, 200), Image.ANTIALIAS)
        _photo.file = resized_image
        _photo.save()


        return HttpResponse("your image has been saved")

but i get this error:

'Image' object has no attribute '_committed'

i'm sure my mistake is in views.py but i dont now how to fix it. how can put resized_image that is an object of Image class to 

a model.

can you help me please?

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