Taming BIG Rails Applications with Component Based Architecture

Starting a new Rails app is a fun adventure. It’s a wide open pasture of conventions. Then it gets to a point. We all know what that point is. It’s when running the test suite takes a few minutes. It’s when you have to think hard about where new functionality goes. It’s when you have to add yet another method to the user object. It’s when tracking down bugs takes half your day.

How do you tame your large Rails application? How do you always keep your test suite small? How do you build your application in such a way that refactoring is straight forward?

We will take a look at concrete steps we can take to break down and refactor our BIG Rails application into smaller gems and engines so we can be happy once more.

Transcript

1. BIG Rails Applications Taming
2. @jwright
3. A Story
5. 4795 lines of code 108 classes 23 controllers 66 models 1:38 test time
6. Directory Structure
17. Search Market Product Search Results Product Photos Market Photos Market Culture Product List Sign Up Sign In Password Reset Profile Payment Processing Purchase History Ticket Selector Cart Checkout Orders Reservations
18. OneGiant App
19. TooMuch for your head
20. New Functionality??
21. Small Large apps app a lot one
22. Rails Engines
23. rails plugin new [name] —mountable
24. > app > config > db > lib > log > vendor > engine_name
25. > Gemfile > Rakefile > app > bin > config > lib > test > engine_name
26. Build Walls
27. Gives Box you a to talk about
28. More Maintainable
29. Example
32. app/models/review.rb
33. app/models/offer.rb
34. db/migrate/_create_reviews.rb
35. spec/integration/models/review_spec.rb
36. app/views/tours/_reviews.html.erb
37. app/views/tours/_review.html.erb
38. 1. Namespace
39. Ebert
40. mkdir app/models/ebert mv app/models/review.rb app/models/ebert
41. app/models/ebert.rb
42. app/models/ebert/review.rb
43. app/models/offer.rb
44. mkdir spec/integration/models/ebert mv spec/integration/models/review_spec.rb spec/integration/models/ebert
45. spec/integration/models/ebert/review_spec.rb
46. spec/factories/reviews.rb
47. 2. Concern
48. app/models/offer.rb
49. app/models/ebert/reviewable.rb
50. app/models/ebert.rb
51. app/models/offer.rb
52. app/models/ebert/review.rb
53. app/models/ebert/review.rb
54. app/models/ebert.rb
55. 3. Engine
56. mkdir components rails plugin new ebert —mountable mv ebert components
57. > Gemfile > Rakefile > app > bin > config > lib > spec > ebert > app > components
58. Gemfile
59. mv app/models/ebert/review.rb components/ebert/app/models/ebert
60. mv app/models/ebert/reviewable.rb components/ebert/app/models/ebert
61. components/ebert/lib/ebert.rb
62. components/ebert/lib/ebert/engine.rb
63. mv app/views/tours/_reviews.html.erb components/ebert/app/views/ebert mv app/views/tours/_review.html.erb components/ebert/app/views/ebert
64. app/views/tours/show.html.erb <%= render partial: ‘ebert/reviews’ %>
65. rm -rf app/models/ebert rm app/models/ebert.rb
66. 4. Move Tests
67. components/ebert/ebert.gemspec
68. mv spec/integration/models/ebert/review_spec.rb components/ebert/spec/integration/models/ebert/
69. mv db/migrate/_create_reviews.rb components/ebert/db/migrate
70. components/ebert/lib/ebert/engine.rb
71. Fin
72. Considerations
73. rake bundle:all
74. rake test:suite:all
75. gem ‘search’, path: ‘components/search’
76. Way of the Future
77. /features Wrapper App Common Search Markets Products Registration Reservations API Orders User Photos Ebert
78. Resources
79. http://bit.ly/1onMOOf Midwest Ruby Conf 2013 - Component Based Architecture in Rails [video]
80. http://bit.ly/1tAMguy Rocky Mountain Ruby 2013 - How I Architected my Big Rails App [video]
81. http://bit.ly/1BZXYTn GitHub - The Next Big Thing [code]
82. http://bit.ly/VMnVFb Pivotal Labs - Rails Application Suites [blog]
83. Thank You