Slides from small meetup about web technologies. It's about how Ruby On Rails app can be big and monolith and how we resolved it in our app.

1. How (not) to get lost in bigger
Ruby On Rails project
More layers than only MVC
and maybe more mess

2. - Oliver Kriška - quatermain32@gmail.com
- first e-shop in 2015
- FRI UNIZA 2008 - 2011
- EUBA 2011-2011
- Kadetade 2009 - ...
- Ruby on Rails 2011
- BeeSafe 2013 - ...
- freelancing 2014
- ShopVox (SF - USA) 2014 - ...
Who am I?
fatality
fail
WIN

3. What is Ruby On Rails?
- 2004
- MVC framework
- Ruby language (1995)
- Optimize for programmer happiness
- Convention over Configuration
- Exalt beautiful code
- Value integrated systems (complete solution)
- Basecamp, GitHub, Shopify, Airbnb, Twitch, SoundCloud, Hulu, Zendesk, Square,
Highrise, Envato Marketplace (Themeforest, Photodune, ...)
by http://rubyonrails.org/doctrine

4. What is MVC?
- Design Pattern
- Architectural
Pattern
- Model
- View
- Controller
Browser Model
Controller
View
by Google Search

5. RoR vs MVC?Browser
DBController
Requests
Responses
View
Model
DB Queries
Create/Update
Read
Load Data
Response
Read

6. What is Shopvox?
- Complex
- Web-based
- Job management
- CRM
- Point of Sale (POS)
- For custom shop and print industry

7. ShopVOX vs MVC
Controller ModelView
Presenter Query
Service

8. Why so complicated?
- Fat model
- Fat controller
- Fat view
- Too much logic!!
- Creating Work Order
- ~350 lines
- Model?
- Controller?
- Service per action
- Index Jobs
- ~ 150 lines query
- JSON presenter - ~ 350 lines
- View?
- Presenter

9. What is Presenter?
- Move logic from html/json template to some class
- Nice & clean template
- Freedom of use
- Speed
- Decorators, Presenters, JSONPresenters(?)

10. What is Service?
- Move logic from Controllers and Models
- Dynamic validations
- Creating nested models
- Complex logic
- Indexing
- Backup data
- Counting
- Notifications
- Third Party APIs
- Generators (Transaction numbers, Colors, Keys)

11. What is Query?
- Move logic from Controllers
- Dynamic queries
- Filters/Conditions
- Ordering
- Restrictions
- Calculations
- Stats (pagination, summary)
- Speed
- Loading connected data
- Loading only necessary data
- Jobs query
- 27 parts
- Pos query
- 6 base classes
- 200 lines
- 50 parts