Seems to work. One last question - how can I check if a particular call hit the db or not?
On Jul 23, 3:03 pm, Adi <aditya.sa...@gmail.com> wrote: > Great. That's what I was looking for - in memory filtering. Will try > and let you know! > > On Jul 23, 3:02 pm, mdipierro <mdipie...@cs.depaul.edu> wrote: > > > > > No because they two queries are different. The second query will not > > find the cached results from the first and pull them again. > > > You can do > > > def index(): > > videos = db( myquery ).select(cache=(cache.ram,0)) # myquery is > > across multiple tables, with joins. > > > def favorites(): > > fav_videos =db( myquery ).select(cache=(cache.ram, > > 3600)).find(lambda row: row.video.folder=='favorites') > > > The find command will give you a subset of an existing Rows object (in > > this case the cached one) > > > On Jul 23, 4:52 am, Adi <aditya.sa...@gmail.com> wrote: > > > > Ok I'm going to bug you a little more till I understand this well > > > enough :) > > > > there are two functions in controller: > > > def index(): > > > # here I will hit database because user first comes here > > > videos = db( myquery ).select(cache=(cache.ram,0)) # myquery is > > > across multiple tables, with joins. > > > > def favorites(): > > > # here I want to get a subset of "videos" > > > fav_videos = db( myquery & db.videos.folder == > > > 'favorites').select(cache=(cache.ram, 3600)) > > > # this query should not hit database because of the earlier query > > > in index() > > > > Is this the correct behavior? > > > > On Jul 23, 2:45 pm, mdipierro <mdipie...@cs.depaul.edu> wrote: > > > > > You place > > > > > videos=db(db.video.id>0).select(cache=(cache.ram,0)) > > > > > where you want the videos to be extracted from db. > > > > > videos=db(db.video.id>0).select(cache=(cache.ram,3600)) > > > > > everywhere you need to get the list of videos. > > > > > On Jul 23, 4:38 am, Adi <aditya.sa...@gmail.com> wrote: > > > > > > But where will I place this query, for "videos" to be accessible > > > > > everywhere else? > > > > > > On Jul 23, 2:29 pm, mdipierro <mdipie...@cs.depaul.edu> wrote: > > > > > > > videos=db(db.video.id>0).select(cache=(cache.ram,3600)) > > > > > > > 3600 are seconds and it is the cache time. If you replace the value > > > > > > with 0, it will be re-computed. > > > > > > > On Jul 23, 4:13 am, Adi <aditya.sa...@gmail.com> wrote: > > > > > > > > Hi all, > > > > > > > > I have this use-case: > > > > > > > > There is a set of rows being queried from the database. > > > > > > > > videos=db(db.video.id>0).select() > > > > > > > > Now I have three different views (in same controller) where I > > > > > > > want to > > > > > > > access these rows (with additional filters), but I want to prevent > > > > > > > multiple db calls. > > > > > > > > def index(): > > > > > > > # use videos here with an additional filter > > > > > > > home_videos = [v for v in videos if v.folder == 'home'] > > > > > > > > def favorites(): > > > > > > > fav_videos = [v for v in videos if v.folder == 'favorites'] > > > > > > > > These views essentially fetch subset of the same dataset and > > > > > > > display > > > > > > > them. > > > > > > > > Question: > > > > > > > ------------- > > > > > > > Is there a way to "cache" the first db call "videos = ... " and be > > > > > > > able to access "videos" variable without hitting database again, > > > > > > > as > > > > > > > long as this session exists? > > > > > > > > I am not sure if and how I can use global variables here, and will > > > > > > > they reliably persist.
