1.
Practical SOLID
with Rails
Andrey Savchenko
CTO @ Aejis
Tuesday, March 19, 13

2.
Let’s start the our new, awesome project!
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3.
class < ActiveRecord::Base
belongs_to :company
has_many :products
has_many :warehouses
validates_presence_of :name
end
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4.
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5.
10 months later...
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6.
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7.
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8.
SOLID
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9.
SOLID
• Single responsibility principle
• Open-Closed principle
• Liskov substitution principle
• Interface segregation principle
• Dependency inversion principle
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10.
SRP
• Easy to read
• Easy to change
• Easy to reuse
No god objects
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11.
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12.
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13.
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14.
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15.
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16.
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17.
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18.
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19.
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20.
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21.
PROFIT!?
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22.
So much objects? NO!
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23.
YES!
• https://github.com/drapergem/draper
• https://github.com/mbj/aequitas
• https://github.com/Ptico/resourced
• https://github.com/bogdan/datagrid
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24.
OCP
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25.
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26.
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27.
LSP
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28.
ISP
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29.
DI
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30.
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31.
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32.
Picture with cat
Because everyone loves cats <3
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33.
Questions?
• Twitter: @ptico
• Github: @ptico
Tuesday, March 19, 13