.net - Architecture of Azure Mobile Services Application -


i'm trying piece architecture windows universal app leveraging azure mobile services. it's lob app , need handle 100-250 offline\online tables. mobile services doesn't support nested complex objects on service side i've mapped of tables straight through entity framework.

the question have whether should use separate layer reconstitute dto's or if should doing through service layer , view model. main concerns isolation of responsibility (large team) , performance overhead additional mapping.

didn't have reputation add image here's link model.

enter image description here

an example person object collection of addresses attached. have 3 dto objects: 1 person 1 address , 1 many many relationship. if i'm mapping straight through view model i'd need addressing service lookup address specific person.

if insert "model" layer service returns person model collection of address on it. feels bit wrong though...

the right choice depends on how doing querying on client. in case, want querying on address directly, helpful have address table on client.

the reason doing mapping dtos said: there no direct support relationships between objects in azure mobile services. design ensure simple model interacting between client , server, can mean more design when data model involve relationships.

in general, advise following:

  1. if have 1:many relationships there explicit ownership relationship between parent , children, best map child objects parent. simplifies case when mobile client creates new child objects , associates parent. offline sync protocol sends changes individually, objects must grouped if need 1 atomic action. example of this, see fieldengineerlite sample.

  2. if have 1:many relationships , it's not important query on child objects directly, can either map in #1, or create separate table controllers children , manage mapping foreign keys.

  3. for many:many relationships, adds complexity expose relationship table directly. here, consider flattening object ids 1 of objects. in example, customer dto have list of address ids, , addresses in own table on client.

if choose option #3, code needs make sure relevant addresses sent down client. either a) map flattened object , unpack on client side, or b) add clauses either client or server side query addresses client gets right data.

in case (b), should ensure changes address table pulled down before doing queries on customer table. case (b) easy implement if there query can done scope addresses pull down.

for instance, suppose building crm app customer assigned salesperson using app. then, join on customer , address , addresses belong customer owned logged in user.


Comments

Post a Comment

Popular posts from this blog

html - Outlook 2010 Anchor (url/address/link) -

i'm trying link specific pdf page msoutlook'10 or msword'10, #page=... anchor particularly useful , works fine elsewhere. unfortunately when click [ctr-k] in outlook or winword, links re-formatted assuming unc path. pdf file located on shared drive. using "file:" prefix links open pdf in adobe reader (outside of browser), , "http:" open inside browser. issue seem need open in browser "file:" prefix in order anchor work. know anchors work inside browser. outlook uses windows/explorer default program (based on file extension) seems open in adobe reader neglecting anchor. is aware of solution, link specific page or bookmark of shared-pdf ms outlook and/or winword link? common references: mailermailer.com/...anchor-tags-html-emails campaignmonitor.com/...anchor-links-in-email-newsletters/ stackoverflow.com/...anchor-in-pdf-document
Read more

javascript - Why does running this loop 9 times take 100x longer than running it 8 times? -

consider code: test = function() { } t = new test(); (var = 0; < 8; i++) { result = t instanceof test; } if change number of iterations 8 9 , loop take 100 times longer complete in latest version of firefox (41.0.1). tested on 2 different pcs , magic limit 8. here jsperf test used: http://jsperf.com/instanceof-8-times-vs-9-times does have idea why might happen? seems specific instanceof . not happen if else object, example check property. note: filed bugzilla bug this. jan de mooij mozilla team has posted details in bugzilla thread . here's simplistic interpretation of highly technical answers: in i < 8 case, firefox smart enough hoist result = t instanceof test; statement out of loop (according tests, doesn't seem omit altogether). in i < 9 case, apparently doesn't optimization . why? reason not clear, related fact 9 iterations threshold above function considered "hot" enough run through jit compiler. i < 8 cas...
Read more

Getting gateway time-out Rails app with Nginx + Puma running on Digital Ocean -

following this guide setup app on digital ocean droplet, not working. site not loading , it's throwing: "gateway time-out". the puma server works, since ps aux | grep puma prints: root 15878 0.0 0.4 376832 2168 ? sl 12:50 0:00 puma 2.13.4 (unix:///var/www/myapp/shared/tmp/sockets/myapp-puma.sock) [20150930164940] root 15881 0.0 0.7 903676 3692 ? sl 12:50 0:06 puma: cluster worker 0: 15878 [20150930164940] root 24654 0.0 0.1 11748 916 pts/2 s+ 18:00 0:00 grep --color=auto puma my nginx config: user root; worker_processes 1; events { worker_connections 1024; } http { upstream puma { server unix:///var/www/myapp/shared/tmp/sockets/myapp-puma.sock; } server { listen 80; server_name myapp.com; root /var/www/myapp/current/public; access_log /var/www/myapp/current/log/access.log; error_log /...
Read more