This document summarizes a Rails developers meetup. It discusses using domain-driven design principles like separating domain models from presentation logic. Presenters act as interfaces between controllers and forms. Forms are updated to accept presenters as arguments. This improves separation of concerns. The meetup also covered continuous integration, technical debt, and domain-specific languages in Rails. Finally, it advertised an upcoming Repro Tech meetup and job openings at Repro.

1. Octocat
?
2018/07/13 @treby006
Rails Developers Meetup Day3

2. • treby (@treby006) Shinjuku.rb
• Repro Dev2
• Rails
• Rails, Vue.js, AWS(ECS, EMR), Go

3. Repro
• Rails
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4. Repro
• Rails
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5. Commit 2

6. Additions/Deletions 1
( )

7. Repro
• Rails
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• CTO Contribute

8. Repro

9. We are hiring!!
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• / B to B
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• Conference

11. :

12. : Technical debt
(design debt)
---- Wikipedia

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• =>
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20. (Rails )

21. 1
DSL/
class SomeDSL
def self.configulation(*args)
end
module Definition
def provide(&definition)
end
end
:
:
end

22. DSL/
• 0 → 1
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……

23. DSL/
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• DSL/

24. DSL/
• Ruby
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• gem OSS

25. 2
class SomeController < ApplicationController
:
:
def create
@presenter = SomePresenter.new(@some_model)
if @presenter.save
redirect_to :some_path
else
render :new
end
end
end

26. 2
class SomePresenter < PresenterBase
attr_reader :form
delegate :save, to: :form
def initialize(some_model)
@form = SomeForm.new(some_model.attributes, self)
end
:
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end

27. 2
class SomeForm < FormBase
validate :something
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def initialize(params)
:
:
end
end

28. •
• Rails
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• ……

29. SomeForm : Before
class SomeForm < FormBase
validate :something
:
:
def initialize(params)
:
:
end
end

30. SomeForm : After
class SomeForm < FormBase
validate :something
:
:
attr_reader :presenter
def initialize(params, presenter)
:
@presenter = presenter
:
end
def validate
presenter.some_methods
super
end
end

31. Presenter : Before
class SomePresenter < PresenterBase
attr_reader :form
delegate :save, to: :form
def initialize(some_model)
@form = SomeForm.new(some_model.attributes, self)
end
:
:
end

32. Presenter : After
class SomePresenter < PresenterBase
attr_reader :form
def initialize(some_model)
@form = SomeForm.new(some_model.attributes, self)
end
def save
:
@form.save
:
end
:
:
end

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35. • CI
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40. :

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52. https://speakerdeck.com/joker1007/realworld-
domain-model-on-rails

53. https://speakerdeck.com/joker1007/realworld-
domain-model-on-rails

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55. • Rails
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• CoC (Convention over Configuration)
• Rails Rails
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59. !

60. !

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63. We are hiring!!
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• / B to B
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• Conference

64. Repro Tech Meetup
https://repro-tech.connpass.com/event/94282/

65. Happy Hacking!!

66. :