Ah ok, that makes sense. Is it really that easy to come up with a web
request that takes more than thirty seconds? I'll have to watch out
for that...
I'm thinking now that I'm going about this the wrong way as regards
the design for the datastore - from what I've read, contains is an
efficient
the 30 second timeout can be hit if you are doing something that triggers a
few hundred sub-queries.
contains is very nice. yes it's then a pain to add/remove items from the
list, but GAE is all about query efficiency at the expense of write
efficiency.
cfh
right, so when i need to do a belongs query for more than 30 items:
items=db(db.my_table.end_user.belongs(id_list[0:30])).select()
for i in range(30, len(id_list)+30, 30):
items = items \
db(db.my_table.end_user.belongs(id_list[i-30:i])).select()
i'd say that
some thoughts.
- belongs can only have 30 items in it per execution. GAE limitation
- i do many-to-many on GAE by using join tables, i just have to do more
queries. it does mean that you can't return 100 courses plus all the
students in the course in a single query (if say each course
That's good to know, thanks - so for more than 30 items, something
like this
people = db(db.person.id.belongs(course.students)).select()
isn't possible?
Would it be possible for you to give me an example of using join
tables?
(I think my brain is still in SQL mode and I can't work out how I'd
(posting Massimo's reply)
e.g. 1, Physics 101, 4|5|6
Is that how data has to be modelled using the GAE datastore?
No. On GAE 'list:reference' maps into a ListProperty of integers
If so, is
it possible to do the following:
- paginate the denormalised data, for example show a paginated list
So it sounds like it's possible to do what I want, although if I do
want to do many to many perhaps GAE isn't the best fit. I'm going to
persevere and see if I can get it working, as GAE is very attractive
as a hosting option where I don't have to worry at all about scaling,
server maintenance or
- paginate the denormalised data, for example show a paginated list of
students on a course?
You cannot. ListProperty does not allow this.
How about something like this?
limitby = (0, 10)
students = db(db.student.id.belongs(course.students)).select(limitby =
limitby)
(where
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