Storing images in google storage using Flask (Python)

Question

I use a jar on the Google engine and are desperately looking for help to solve it. The GAE documentation talks about storing images in a data warehouse using BlobProperty, which should be done something like this: -

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

The image should now be stored in the data warehouse, doing the following: -

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 I can’t do it. how do I get db.Blob accepts the string, but given the Filestorage object ... Can anyone help me with this. Also, if anyone can hint me how to transfer the image after upload.

Answer 1

So, here is how I finally decided this: -

@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')

, : -

@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)

Answer 2

BlobStore . db.Blob blobstore.BlobReferenceProperty: http://code.google.com/appengine/docs/python/datastore/typesandpropertyclasses.html#BlobReferenceProperty

, : http://code.google.com/appengine/docs/python/blobstore/overview.html#Complete_Sample_App

Answer 3

I have the following model

class Picture(db.Model):    
    data = db.BlobProperty()
    ext = db.StringProperty()
    content_type = db.StringProperty()

and save it using the following code:

def create_picture():
    if request.files['file']:                       
        picture.data = request.files['file'].read()
        picture.ext = request.files['file'].filename.rsplit('.', 1)[1]
        picture.content_type = request.files['file'].content_type
        picture.put()
        flash(u'File uploaded', 'correct')
        return redirect(url_for("edit_picture", id=picture.key()))
    else:
        return render_template('admin/pictures/new.html', title=u'Upload a picture', message=u'No picture selected')

To sketch, you can use the following code:

@frontend.route('/thumbnail/<id>/<width>x<height>.<ext>')
def thumbnail(id, width, height, ext):
    key = db.Key(id)
    picture = Picture.get(key)
    img = images.Image(picture.data)

    if width != '0':
        w = int(width)
    else:
        w = img.width

    if height != '0':
        h = int(height)
    else:
        h = img.height

    if img.height > h and h != 0:
        w = (int(width) * img.width) / img.height;

    if img.width > w:
        h = (int(height)  * img.height) / img.width;

    thumb = images.resize(picture.data, width=w, height=h)    
    response = make_response(thumb)
    response.headers['Content-Type'] = picture.content_type
    return response