Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
The scary fairy tale about MVC or How to stop worrying and start to write ruby code
Search
Andrey Savchenko
May 31, 2013
Programming
3
260
The scary fairy tale about MVC or How to stop worrying and start to write ruby code
Hotcode conference, 5 May 2013
Andrey Savchenko
May 31, 2013
Tweet
Share
More Decks by Andrey Savchenko
See All by Andrey Savchenko
Building web-API without Rails, registration or sms
ptico
3
820
The big, the small and the Redis
ptico
1
220
Zen TDD
ptico
2
180
The Application: An Unexpected Journey
ptico
1
280
How to f*ck up the refactoring
ptico
11
440
Practical SOLID with Rails
ptico
5
590
Redis - little helper for big applications (rus)
ptico
3
150
Other Decks in Programming
See All in Programming
リハビリmruby
kishima
1
160
HMSコンペ 11th Solution (team : kansai-kaggler)
t88
1
680
ピグパーティにおけるMongoDB CommunityバージョンからAtlasへの移行事例
10969hotaka
0
130
Polarsの成長: v0.14からv1.0までの変遷と今後の展望
zerebom
1
350
初心者がおさえておきたいAWS CDKのベストプラクティス 2024
konokenj
15
7.3k
Google's Recipe for Scaling (Web) Security – LocoMocoSec 2024
lweichselbaum
0
170
さきがけから振り返るアーキテクチャ刷新 / Reflecting on the Architectural Renewal from the Vanguard
nrslib
2
780
Microservices rules (July 2024) : what good looks like
cer
PRO
0
1.6k
実用的かつリーズナブルな 「Azure × Gemini × LINE」~キャラクターBot 実装ライブデモ~
tomodo_ysys
1
170
Activities at Cairo Library
cairolibrary720
0
1.2k
CSC307 Lecture 05
javiergs
PRO
0
210
Prompt FlowによるLLMアプリケーション開発
yuto2000
1
1k
Featured
See All Featured
個人開発の失敗を避けるイケてる考え方 / tips for indie hackers
panda_program
78
15k
Exploring the Power of Turbo Streams & Action Cable | RailsConf2023
kevinliebholz
12
3.8k
Embracing the Ebb and Flow
colly
81
4.3k
Adopting Sorbet at Scale
ufuk
71
8.8k
XXLCSS - How to scale CSS and keep your sanity
sugarenia
245
1.2M
Dealing with People You Can't Stand - Big Design 2015
cassininazir
360
22k
Keith and Marios Guide to Fast Websites
keithpitt
408
22k
Save Time (by Creating Custom Rails Generators)
garrettdimon
PRO
13
430
Facilitating Awesome Meetings
lara
46
5.8k
Debugging Ruby Performance
tmm1
71
11k
ReactJS: Keep Simple. Everything can be a component!
pedronauck
662
120k
What the flash - Photography Introduction
edds
65
11k
Transcript
The scary fairy tale about MVC How to stop worrying
and start to write ruby code or
Andrey Savchenko @ptico @ptico_eng Aejis
Cast • Little Red Riding Hood - developer • Grandmother
- customers • The map - MVC • Compass - Rails And others…
nce upon a time, a little girl goes trough the
scary wood to deliver pies to her grandmother. O
here she met the Damn Horrible Human nicknamed «The Wolf»
T
here you are going, little girl? he asked. I’m going
to deliver pies to my grandma – she answered. W –
have a present for you – wolf said. Take this
map and this compass: it works very well for me. I
None
he girl took gifts and moved on. And have lost
in the wood. Because the compass was point to the wolf’s grandmother and map defines the ways not applicable for little girls. T
THE END
Moral: the tools which works for other person may doesn’t
work for you
MVC is a good example
What’s wrong with MVC?
It has only three letters MVC
One of them superfluous MVC
Application should know nothing about representation
Another one means a little bit more than nothing MVC
The controller should delegate the work that needs to be
done to other objects; it coordinates or controls the activity. It should not do much work itself. GRASP controller definition
So, what’s left?
The model M
M
M
M
None
Please, rise your hand if you have this kind of
models
So, this is a moment when we should start writing
the Ruby code
What does it mean?
Lets take a look at our daily gems
carrierwave
state_machine
resque
Ok, i catch the idea, lets start!
Wait a minute - we need some weapons
Metrics
Metrics • WPM - WTFs per minute
Metrics • WPM - WTFs per minute • SLOC/M -
Source lines of code per method
Metrics • WPM - WTFs per minute • SLOC/M -
Source lines of code per method • SLOC/C - Source lines of code per class
Overall complexity ((AVG(SLOC/M) + SLOC/C)^WPM)/100
Overall complexity If you have > 10 – i have
a bad news for you
Principles • SOLID
Principles • SOLID • YAGNI
Principles • SOLID • YAGNI • KISS
Secret weapon: Testability
The simpler your objects to test - the easier they
can be changed and reused
The more complex your objects is - the harder to
test them
Got it! What about strategy?
Strategies:
Use-case strategy
Use-case strategy • Doesn’t work with Rails • Requires to
build your own stack • But once you build this – its bullet-proof
Onion strategy
None
Onion strategy • Do work with Rails • Layer can
be just Plain Old Ruby Object • Layers is hard to naming
Onion strategy Model Controller View
Onion strategy Model Controller View Presenter
Onion strategy Model Controller View Presenter Form object
Onion strategy Model Controller View Presenter Form object Repository
Onion strategy Model Controller View Presenter Form object Repository Service
Onion strategy Model Controller View Presenter Form object Repository Service
Validator
Attribution: http://www.flickr.com/photos/42255449@N00/7177978063/ http://www.flickr.com/photos/normanbleventhalmapcenter/2674605704/ Thank you!
Questions? Andrey Savchenko Aejis* * we are hiring** ** if
you understand the problem described in talk