Taming God Objects: easy, incremental and secure

Everyone has worked with an app with enormous classes, filled with mixed responsibilities. They're hard to understand, hard to change and hard to test.

In this presentation we're gonna learn a refactoring technique to start taming those little monsters.

Transcript

15. • • • • •
16. • •
17. •
18. •
22. God class You SRP
28. Split
30. READ WRITE
31. WRITE Piece to extract READ WRITE
32. •
33. •
34. •
35. READ User::Settings READ WRITE WRITE User::Settings
36. •
37. •
39. • • ◦
41. READ READ WRITE WRITE settings User::Settings
42. •
43. •
44. •
45. READ User::Settings READ WRITE WRITE settings WRITE User::Settings
46. •
47. • •
48. READ User::Settings READ WRITE WRITE settings WRITE user
49. • •
50. •
51. READ User::Settings WRITE WRITE settings WRITE READ user
52. • •
53. • •
54. READ User::Settings WRITE settings WRITE READ user ✂
55. •
56. •
57. •
59. Split
61. WRITE Piece to extract READ WRITE
62. READ User::Settings READ WRITE WRITE User::Settings
63. READ READ WRITE WRITE settings User::Settings
64. READ User::Settings READ WRITE WRITE settings WRITE User::Settings
65. READ User::Settings READ WRITE WRITE settings WRITE user
66. READ User::Settings WRITE WRITE settings WRITE READ user
67. READ User::Settings WRITE settings user ✂ WRITE READ
70. • • • •
71. • ◦ Refactoring (Book) • ◦ Get a Whiff of This (Talk at RailsConf 2016) • ◦ Strangler Fig Pattern