Brian,
I just re-read your thread more carefully. I think what you want to
know is simply:
reel_frames = reel.frames.order('auto_now_add_prop.order')
'frames' on Reel (created by the reference property from Frames) is
just a query object.
Robert
On Wed, Feb 24, 2010 at 3:01 PM, Robert Kluin <robert.kl...@gmail.com> wrote:
> Alex,
> You can only order by properties on the model itself. If you want
> to order by a property on a referenced model, you need to include it.
> So in your case you might want to add a "reelName" property to Frame,
> then just be sure you handle updating that property when you change
> the name on Reel.
>
> Robert
>
>
>
>
>
>
>
> On Wed, Feb 24, 2010 at 9:09 AM, Alex <alexle...@googlemail.com> wrote:
>> Hi,
>> Is it possible to do anything with a reference property other than
>> cycle through the referenced objects in whatever order they are
>> returned? For example I have a number of reference properties to
>> instances where the creation date is crucial to how they are
>> subsequently managed. Is there a way to order the result?
>>
>> class Reel(db.Model):
>> name = db.StringProperty()
>>
>> class Frame(db.Model):
>> # datetime.datetime.now() when the object is first created.
>> auto_now_add_prop = db.DateTimeProperty(auto_now_add=True)
>> # reference to the one and only reel this frame belong to
>> reel = db.ReferenceProperty(Reel, collection_name='frames')
>>
>> I would like to order 'reel.frames' depending on the
>> 'auto_now_add_prop' date. Is this the right way to access these
>> instances if date order access is frequent and crucial?
>> The Frame model will have millions of instances so a query there
>> matching for a given Reel instance would be expensive. Ideas/advice/a
>> thread I haven't seen?
>>
>> Alex
>>
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