anyone?
On Mar 16, 1:09 pm, iceanfire <iceanf...@gmail.com> wrote:
> Also, now when I ran the following code in the console:
> ========================================
>
> from google.appengine.ext import db
>
> key_of_specific_Thumb_entity = "agdhcHRydXNochALEgpJbWFnZVRodW1iGEUM"
> <<==key grabbed from datastore for thumbnail (which is a parent of the
> Bin/Large Image)
>
> db.get(db.Key(key_of_specific_Thumb_entity))
>
> I get this error:
> ============
>
> Traceback (most recent call last):
> File "C:\Program Files\Google\google_appengine\google\appengine\ext
> \admin\__init__.py", line 194, in post
> exec(compiled_code, globals())
> File "<string>", line 5, in <module>
> File "C:\Program Files\Google\google_appengine\google\appengine\ext
> \db\__init__.py", line 1053, in get
> cls1 = class_for_kind(entity.kind())
> File "C:\Program Files\Google\google_appengine\google\appengine\ext
> \db\__init__.py", line 217, in class_for_kind
> raise KindError('No implementation for kind \'%s\'' % kind)
> KindError: No implementation for kind 'ImageThumb'
>
> I'm guessing it has something to do with it being a parent or
> something!?
>
> On Mar 16, 1:03 pm, iceanfire <iceanf...@gmail.com> wrote:
>
>
>
> > Hi,
>
> > I'm having a bit of trouble understanding how to use parents/children
> > properties within transactions.
>
> > I have divided up my "Thumbnails" and the actual "Large Image" into
> > two separate models to save processing power, but when I upload, I
> > want to make sure that both entities are updated--therefore I have to
> > use transactions.
>
> > Short version (incase the answer is something simple):
> > ==========================================
> > Can I query to find out the children entities of a Parent entity?
>
> > Long Version:
> > ===========
> > Key fact - thumbnails is connected to the Large Image (bin) via the
> > column "bin_id"
>
> > The code in Exhibit 1 doesn't work because I get the 'error
> > "ImageThumb" must have a complete key before it can be used as a
> > parent'. So I tried to:
> > 1. .put() ImageThumb
> > 2. assign it as a parent
> > 3. .put() Bin (the large image)
> > 4. get the ID from step 3
> > 5. insert the id in the ImageThumb and .put() it again.
>
> > I got the error: you can't put an entity more than once in appengine!
>
> > So my last resort was to just get rid of binID and do steps 1-3. This
> > works! But now i'm stuck as to getting the Large Image (child) for a
> > specific thumbnail(parent).
>
> > Code Exhibit 1
> > ======================
> > def uploadImages(self):
> > thumb_db = ImageThumb()
> > thumb = images.resize(image_data,
> > 150,150,images.JPEG)
> > thumb_db.thumb = db.Blob(thumb)
>
> > bin_db = ImageBin(parent=thumb_db)
> > bin_db.image = image_data
> > bin_put=bin_db.put()
> > bin_id = bin_put.id()
>
> > thumb_db.binId = bin_id <<=== need binId so
> > that thumbnail is linked to actual image (so I can use get by id
> > class)
>
> > thumb_db.type= "Picture"
> > thumb_put = thumb_db.put()
> > thumb_id = thumb_put.id()
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