Storing images in google datastore using Flask (Python)

Question

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

Ok so this is how I finally solved it:-

@userreg.route('/mypics',methods=['GET','POST'])
def mypics():    
   if request.method=='POST':
      mydata=MyPics()
      mydata.name=request.form['myname']
      file=request.files['file']
      filedata=file.read()
      if file:
         mydata.pic=db.Blob(filedata)
      mydata.put()
      return redirect(url_for('home'))
   return render_template('mypicform.html')

The above stores the file as a blob in the datastore and then it can be retrieved by the below func:-

@userreg.route('/pic/<name>')
def getpic(name):
     qu=db.Query(MyPics).filter('name =',name).get()
     if qu.pic is None:
         return "hello"
     else:
         mimetype = 'image/png'
         return current_app.response_class(qu.pic,mimetype=mimetype,direct_passthrough=False)