I dont understand. Why is he allowed to do this? userfile = UserFile.get(key)
[...] bin = userfile.filebin_set.get() userfile shouldnt have a filebin_set property? Otherwise, what I think he did was to put the ReferenceProperty in the "file" model rather than in the "file info" model. On Nov 10, 6:08 pm, Sylvain <[EMAIL PROTECTED]> wrote: > Check this : http://d.hatena.ne.jp/ikasamaH/20080612 > > On 10 nov, 17:50, Kenchu <[EMAIL PROTECTED]> wrote: > > > Let's say I've got a model with a BlobProperty() holding data up to 2 > > MB. Take this for example: > > > class SomeDataFile(db.Model): > > title = db.StringProperty() > > data = db.BlobProperty() > > > Now imagine I'd just want to fetch the title property for the items in > > this model. if I'd query the model, then the datastore would fetch the > > data property for every item. As far as I know, there's no way to ask > > the datastore to select specific fields, making this query extremely > > heavy since each data property would be fetched as well (which might > > be 2 MB / item). > > > I thought I might solve this by using another table for the actual > > data, and then reference it in the SomeDataFile model as such: > > > class Data(db.Model): > > data = db.BlobProperty() > > > class SomeDataFile(db.Model): > > title = db.StringProperty() > > data = db.ReferenceProperty(Data) > > > But as it turns out, referenced items are included in the result > > making it equally heavy. > > > One solution might be to do this instead: > > > class Data(db.Model): > > data = db.BlobProperty() > > > class SomeDataFile(db.Model): > > title = db.StringProperty() > > data = db.StringProperty() > > > Where SomeDataFile.data is a string value of the key for the Data > > item. But is that really a good solution? > > > So the question is: > > How do you NOT fetch a BlobProperty in a model (you want everything > > but the Blob)? How would you model that? --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Google App Engine" group. To post to this group, send email to google-appengine@googlegroups.com To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/google-appengine?hl=en -~----------~----~----~----~------~----~------~--~---
