Store base64 string image to MongoDB using Gridfs

Question

I am currently trying to store an image in the form of base64 string to the MongoDB using GridFS, here is my working solution so far:

def upload(image_string):
    image_data = base64.b64decode(image_string)
    image = Image.open(io.BytesIO(image_data))
    image.save("foo.jpeg")
    with open("foo.jpeg", "rb") as img:
        storage = GridFS(mongo.mydb, "fs")
        storage.put(img, content_type='image/jpeg')

I was wondering if there is a way to directly upload the image instead of saving the image as a file and read it again for the Gridfs to upload? (Google App Engine doesn't allow file storage)

I looked at the documentation of the put function of Gridfs, but it is quite unclear on the exact type of data type it is taking.

"data can be either an instance of str (bytes in python 3) or a file-like object providing a read() method."

How do I convert the base64 string to bytes that gridfs supports?

Methkal Khalawi · Accepted Answer · 2019-11-22 10:31:36Z

1

Gridfs put method accepts binaries.

# encode your image to binary text
with open("unnamed.jpg", "rb") as image:
    # read the image as text and convert it to binary
    image_string = base64.b64encode(image.read())


# create Gridfs instance
fs = gridfs.GridFS(db)

# add the image to your database
put_image = fs.put(image_string)

answered Nov 22, 2019 at 10:31

Methkal Khalawi

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2 Comments

RonZhang724 Over a year ago

Thanks for the answer, but my input here is a base64 string already and when I try to upload the string directly using the put function, I only pushed the string to the server. storage = GridFS(mongo.ourcloset2, "fs") image_id = storage.put(image_string, encoding='utf-8') The image is not stored as an image object for some reason.

Methkal Khalawi Over a year ago

can you please explain what do you mean by not stored as an image object?. Images using Gridfs will be saved in Mongodb as binary string, then to use them, you can retrieve them and convert them again to images.

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