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Practical SOLID with Rails - Andrii Savchenko

Ruby Meditation #1 February 23, 2013 Kyiv

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Practical SOLID
with Rails
Andrey Savchenko
CTO @ Aejis
Tuesday, March 19, 13
Let’s start the our new, awesome project!
Tuesday, March 19, 13
class < ActiveRecord::Base
belongs_to :company
has_many :products
has_many :warehouses
validates_presence_of :name
end
Tuesday, March 19, 13
Tuesday, March 19, 13
10 months later...
Tuesday, March 19, 13
Tuesday, March 19, 13
Tuesday, March 19, 13
SOLID
Tuesday, March 19, 13
SOLID
• Single responsibility principle
• Open-Closed principle
• Liskov substitution principle
• Interface segregation principle
• Dependency inversion principle
Tuesday, March 19, 13
SRP
• Easy to read
• Easy to change
• Easy to reuse
No god objects
Tuesday, March 19, 13
Tuesday, March 19, 13
Tuesday, March 19, 13
Tuesday, March 19, 13
Tuesday, March 19, 13
Tuesday, March 19, 13
Tuesday, March 19, 13
Tuesday, March 19, 13
Tuesday, March 19, 13
Tuesday, March 19, 13
Tuesday, March 19, 13
PROFIT!?
Tuesday, March 19, 13
So much objects? NO!
Tuesday, March 19, 13
YES!
• https://github.com/drapergem/draper
• https://github.com/mbj/aequitas
• https://github.com/Ptico/resourced
• https://github.com/bogdan/datagrid
Tuesday, March 19, 13
OCP
Tuesday, March 19, 13
Tuesday, March 19, 13
Tuesday, March 19, 13
LSP
Tuesday, March 19, 13
ISP
Tuesday, March 19, 13
DI
Tuesday, March 19, 13
Tuesday, March 19, 13
Tuesday, March 19, 13
Picture with cat
Because everyone loves cats <3
Tuesday, March 19, 13
Questions?
• Twitter: @ptico
• Github: @ptico
Tuesday, March 19, 13

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