views内でdatabaseからimage dataを取得したい

databaseからimageへのpathを得て、ディレクトリ内のimageを開いているつもりなんですが上手く行きません。
objectとして得たものをどうしたらimage fileとして扱えるようになるのでしょうか。

発生している問題・エラーメッセージ

/anaconda3/lib/python3.6/site-packages/django/db/models/fields/__init__.py:1447: RuntimeWarning: DateTimeField MainImageInfo.data received a naive datetime (2018-03-3022:50:26.966149) while time zone support is active.
  RuntimeWarning)
Internal Server Error: /mosaic_app/get_album_images/
Traceback (most recent call last):
  File "/anaconda3/lib/python3.6/site-packages/django/core/handlers/exception.py", line 41, in inner
    response = get_response(request)
  File "/anaconda3/lib/python3.6/site-packages/django/core/handlers/base.py", line 187, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/anaconda3/lib/python3.6/site-packages/django/core/handlers/base.py", line 185, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/Users/Yoshinori/Desktop/mosaic/test4/myProject/mosaic_app/views.py", line 183, in get_album_images
    image = Image.open(path)
  File "/anaconda3/lib/python3.6/site-packages/PIL/Image.py", line 2481, in open
    fp.seek(0)
  File "/anaconda3/lib/python3.6/site-packages/django/core/files/utils.py", line 20, in <lambda>
    seek = property(lambda self: self.file.seek)
  File "/anaconda3/lib/python3.6/site-packages/django/db/models/fields/files.py", line 50, in _get_file
    self._require_file()
  File "/anaconda3/lib/python3.6/site-packages/django/db/models/fields/files.py", line 47, in _require_file
    raise ValueError("The '%s' attribute has no file associated with it." % self.field.name)
ValueError: The 'main_image' attribute has no file associated with it.

該当のソースコード

views.py

python
1from PIL import Image
2from .models import MainImageInfo
3
4
5main_image_path = MainImageInfo.objects.order_by("main_image")[0]
6path = main_image_path.main_image
7image = Image.open(path)
8

models.py

python
1
2
3class MainImageInfo(models.Model):
4
5    main_image = models.ImageField(upload_to ="main_images",blank=True)
6    data = models.DateTimeField(default=datetime.now)
7

試したこと

print(type(main_image_path))
>> <class 'mosaic_app.models.MainImageInfo'>

print(main_image_path)
>> MainImageInfo object

print(type(path))
>> <class 'django.db.models.fields.files.ImageFieldFile'>

print(path)
>> [30/Mar/2018 23:04:22] "POST /mosaic_app/get_album_images/ HTTP/1.1" 200 3867

属性が違うから、扱えないということなのでしょうか。
よろしくお願いいたします。