Storing images in google datastore using Flask (Python)

Question

Hi all, I am using flask on google app engine and am desperately looking for help to solve this. The GAE documentation talks of storing images in the datastore using the BlobProperty , which should be done something like this:-

class MyPics(db.Model):
      name=db.StringProperty()
      pic=db.BlobProperty()

Now the image should be stored in the datastore by doing this:-

def storeimage():
    pics=MyPics()
    pics.name=request.form['name']
    uploadedpic=request.files['file']  #where file is the fieldname in the form of the                
                                        file uploaded
    pics.pic=db.Blob(uploadedpic)
    pics.put()
    redirect ... etc etc

But am unable to do this. as I get db.Blob accepts a string , but given a Filestorage object... Can someone help me with this. Also if anybody could hint me on how to stream the image back after uploading.

Answer 1

You should consider using the BlobStore to store your data. Instead of a db.Blob you would be using blobstore.BlobReferenceProperty: http://code.google.com/appengine/docs/python/datastore/typesandpropertyclasses.html#BlobReferenceProperty

Uploading and download is quite easy as shown here: http://code.google.com/appengine/docs/python/blobstore/overview.html#Complete_Sample_App