btw: your tables aren't large, but small. This will run well with SQLite on every hosting.
Example: - Google App Engine NoSQL for free (with list:string fields for modificator) - Forpsi virtual server 20G SSD with Postgres (or just SQLite) http://www.forpsi.com/virtual/?lang=en-US for 1.2 EUR/month, install Debian (or something different) via VPS administration, run ssh, install nginx+postgres via apt - and go. Or this should install nginx+Web2py on Debian: https://github.com/zvolsky/web2py/blob/master/scripts/setup-web2py-nginx-uwsgi-ubuntu.sh I write that just because you say Amazon EC2 is too expensive(?) Dne neděle 28. srpna 2016 23:21:31 UTC+2 luis.va...@metamaxzone.com napsal(a): > > Hello! > > I've this data structure in my database: i've two tables events and > modificators, one event can have many modificators so i've a one to many > relation. Im trying to build an HTTP endpoint that returns a json with > multiple events and all the asociated modificators, i order to do this i do > a join and return the select as a list, but my problem (and i understand > this problem is related to the way SQL works) is that the parent is > repeating on every record, so i've an event A with four modificators B, C, > D and E i get something like this: > > [{"events": A, "modificator": B}, {"events": A, "modificator": C}, > {"events": A, "modificator": D}, {"events": A, "modificator": E}] > > instead of this i want something like > > [{"events": A, "modificator": [B, C, D, E]}] > > i now i can do this with a for and creating my own custom dictionary, but > i think this problem will be repeated several times along the api im > developing because my database has multiple one to many relations so it > would be good to get some "generic" solution instead of creating a lot of > nested fors for each case, also i think is a little bit inefficient doing > it on this way. > > I was wondering if the DAL or web2py himself has some method for this, or > if you can recomend a external library because i thinks this is a fair > common case, even if you can give me some guidance to develop a common > class, or function for this problem. > > By the way, i read this example in the web2py manual: > > >>> for person in db().select(db.person.ALL): > print person.name > for thing in person.thing.select(): > print ' ', thing.nameAlex > Boat > ChairBob > ShoesCarl > > but i think it doesnt fit my needs because of the high database I/O, im > deploying my app on EC2 (Amazon) and the databases instances have a really > high cost, this is combined with my database having a LOT of records (about > 2000 events and 5800 modificators) and growing. > > > Thanks for any help or guidance you can provide! > -- Resources: - http://web2py.com - http://web2py.com/book (Documentation) - http://github.com/web2py/web2py (Source code) - https://code.google.com/p/web2py/issues/list (Report Issues) --- You received this message because you are subscribed to the Google Groups "web2py-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to web2py+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
