どうしてこうなった？から理解するActive Recordの関連の裏側

大阪Ruby会議04 https://rubykansai.github.io/osaka04/ での発表内容です。

Transcript

1. Osaka RubyKaigi 04 @willnet Shinichi Maeshima Ͳ͏ͯ͜͠͏ͳͬͨʁ ͔Βཧղ͢Δ Active Recordͷཪଆ
2. Shinichi Maeshima    @netwillnet @willnet https://blog.willnet.in Willnet Inc.
3. ੲ೥͚ͩେࡕʹॅΜͰ͍·ͨ͠
4. HJO[BSC
   ΍ͬͯ·͢
5. ٕज़ސ໰ۀΛ͍ͯ͠·͢
6. ͓࢓ࣄ4/4తͳ΋ͷΛ։ൃ ͍ͯ͠·͢
7. 8F`SF
   OPU
   IJSJOH
8. ސ໰ઌʹ͍ͭͯ͸؇ื
9. େࡕ3VCZձٞʹ
   ొஃ͢Δͷ͸ճ໨
12. աڈ࡞ͷࢿྉ͸
    4QFBLFS
    %FDL΍ϒϩάͰ ֬ೝͰ͖·͢
13. ͔͜͜Βຊ୊
14. Osaka RubyKaigi 04 @willnet Ͳ͏ͯ͜͠͏ͳͬͨʁ ͔Βཧղ͢Δ Active Recordͷཪଆ
15. Osaka RubyKaigi 04 @willnet Ͳ͏ͯ͜͠͏ͳͬͨʁ ͔Βཧղ͢Δ Active Recordͷཪଆ
16. Active Record is like a magic w ΈΜͳେ޷͖"DUJWF
    3FDPSE
    w ن໿ʹΑΓɺ·ΔͰຐ๏ͷΑ͏ʹಈ͘
    w ͜Μͳײ͡Ͱಈ͔͘ͳʁͱࢥͬͨΒ͍͍ͩͨͦͷΑ͏ʹಈ͘
    w ͕ɺۃكʹͦ͏Ͱ͸ͳ͍͜ͱ΋͋Δ
21. ؔ࿈Λఆٛ͢Δͱಈతʹϝιου ͕ੜ੒͞ΕΔ
22. ίʔϧόοΫ΋ੜ੒͞Ε͍ͯΔ
23. ʮϞσϧอଘ࣌ʹؔ࿈ઌ΋อଘ͢Δʯ Λ͢ΔίʔϧόοΫ
24. ͜ΕΛ࣮ߦͨ͠ͱ͖ͷڍಈΛઆ໌͠·͢
25. BVUPTBWF@BTTPDJBUFE@SFDPSET @GPS@VTFSͷ࣮ࡍͷॲཧ
26. ͍Ζ͍Ζলུͨ͠ίʔυ
27. ओʹBVUPTBWF
    USVF
    DPNQPTJUF@QSJNBSZ@LFZTͳͲΛলུ͍ͯ͠·͢
28. ؔ࿈ͷϝλ৘ใ
29. CFMPOHT@UP
    VTFSͳͷͰVTFS͕ฦͬͯ͘Δ lVTFS@JEz͕ฦͬͯ͘Δ
30. ϞσϧΦϒδΣΫτຖʹੜ੒͞ΕΔؔ࿈ΦϒδΣΫτɻ 1PTUVTFSͳͲͷؔ࿈ϝιου͸
    શ෦͜ͷΦϒδΣΫτܦ༝Ͱ࣮ߦ͞ΕΔɻ
    ؔ࿈ઌͷΦϒδΣΫτ΋࣋ͭɻ
31. ؔ࿈ઌͷΦϒδΣΫτ͕ඥ͍ͮͯͳ͔ͬͨΒ
    ͳʹ΋͠ͳ͍
32. ؔ࿈ઌͷΦϒδΣΫτ͕
    ӬଓԽ͞Ε͍ͯͳ͔ͬͨΒTBWF
    
33. ؔ࿈ઌͷQSJNBSZ@LFZΛ
    ࣗ਎ͷ֎෦Ωʔͱͯ͠ઃఆ͢Δ
    
34. ίʔϧόοΫ࣮ߦޙʹΫΤϦ͕ൃߦ ͞ΕΔ Post#save before_save User#save INSERT INTO users … post.user_id = user.id INSERT INTO posts …
35. IBT@NBOZ΋େ·͔ͳ࢓૊Έ͸ ಉ͡
36. λΠϛϯά͸ҧ͏
37. 5*14
    ίʔϧόοΫͷൃՐॱ൪͸ BGUFS@ DSFBUFcVQEBUF
    BGUFS@TBWFͷॱ
38. ͜ΕΛ࣮ߦͨ͠ͱ͖ͷڍಈΛઆ໌͠·͢
39. BVUPTBWF@BTTPDJBUFE@SFDPSET @GPS@QPTUTͷ࣮ࡍͷॲཧ
40. ͍Ζ͍Ζলུͨ͠ίʔυ
41. ϩʔυࡁΈͷؔ࿈ઌͷ͏ͪɺ৚݅ʹϚον͢Δ΋ͷΛऔಘ͢Δ
    
42. ࡟আࡁΈͷΦϒδΣΫτ͸ແࢹ͢Δ
    
43. IBT@NBOZͷ਌͕TBWF࣮ߦલʹະӬଓԽɺ
    ΋͘͠͸ࢠ͕ະӬଓԽͳΒ
44. ਌ͷQSJNBSZ@LFZΛࢠͷGPSFJHO@LFZʹׂΓ౰ͯΔ
45. ࢠΛTBWF͢Δ
46. User#save INSERT INTO users … after_save INSERT INTO posts … post.user_id = user.id
47. ؔ࿈ઌͷอଘ͸࿈࠯తʹ࣮ߦ͞ΕΔ
48. User#save INSERT INTO users … INSERT INTO posts … Post#save Comment#save before_save before_save INSERT INTO comments …
49. ͜͜·Ͱͷ·ͱΊ w ؔ࿈Λఆٛ͢ΔͱɺTBWFͨ͠ͱ͖ʹؔ࿈ઌ΋ҰॹʹTBWF͢ΔͨΊͷίʔϧό οΫ͕ఆٛ͞ΕΔ
    w ίʔϧόοΫͷλΠϛϯά͸ؔ࿈ʹΑͬͯҟͳΔ
    w ؔ࿈ઌ͕৽نϨίʔυͰ͋Ε͹Ұॹʹอଘ͞ΕΔ ஫
    ଞʹ΋৚݅͸͋Δ
    w ؔ࿈ઌͷอଘ͸࿈࠯తʹ࣮ߦ͞ΕΔ
51. IUUQTHVJEFTSVCZPOSBJMTPSHBTTPDJBUJPO@CBTJDTIUNMCJEJSFDUJPOBMBTTPDJBUJPOT
53. / 
54. ͜ͷ࣌఺Ͱऔಘͨ͠#PPLΦϒ δΣΫτͨͪʹରͯ͠ɺ൓ରଆͷ ؔ࿈ CPPLBVUIPS ΁Ϩγʔό Ͱ͋ΔBVUIPSΛׂΓ౰͍ͯͯΔ
55. ͳͷͰ͜͜Ͱ͸ΫΤϦ͸ ൃߦ͞Εͳ͍
57. ઌఔͷྫͱಉ༷ʹ൓ରଆͷؔ࿈ʹର͠ ͯϨγʔόΛׂΓ౰͍͕ͯͨɺͲͷؔ ࿈ʹׂΓ౰ͯͨΒ͍͍͔Θ͔Βͳ͍
58. ݁Ռͱͯ͜͜͠ͰΫΤϦ͕ൃߦ͞Εͯ / ʹͳΔ
60. ໌ࣔతʹ൓ରଆͷؔ࿈໊Λࢦఆ͢Δͱ / ͕ղফ͞ΕΔ
61. 3BJMT͔Β૒ํ޲ؔ࿈ͷൣғ͕
    ֦େͨ͠
62. DPO fi HBDUJWF@SFDPSEIBT@NBOZ@JOWFSTJOH
    
    USVF
    ͕ͳ͍ͱ͜͜Ͱ໌ࣔతʹJOWFSTF@PGΛॻ͍ͯ΋ແޮ
63. ͜͜·Ͱͷ·ͱΊ w ૒ํ޲ͷؔ࿈͕ઃఆ͞Ε͍ͯΔͱ͖ʹɺ"DUJWF
    3FDPSE͸൓ରଆͷؔ࿈ʹର ͯ͠ΦϒδΣΫτΛઃఆͯ͘͠ΕΔ
    w ࣗಈͰઃఆ͢Δؔ࿈Λਪଌ͢Δ͜ͱ͕Ͱ͖Δ͕ɺͰ͖ͳ͍ͱ͖ ྫ
    GPSFJHO@LFZΛઃఆ͍ͯ͠Δ ͸໌ࣔతʹJOWFSTF@PGΦϓγϣϯͰ൓ରଆͷؔ ࿈Λઃఆ͢Δඞཁ͕͋Δ
    w 3BJMTҎ߱͸ɺIBT@NBOZͷؔ࿈ʹର͢Δ૒ํ޲ͷؔ࿈͕ޮ͘Α͏ʹͳͬͨ
65. ͜͜·Ͱͷલఏ஌ࣝͰ͜ͷڍಈ͸
    આ໌Ͱ͖Δ
66. Post#save before_save User#save INSERT INTO users … post.user_id = user.id INSERT INTO posts … after_create Post#save before_update
67. Post#save before_save User#save INSERT INTO users … post.user_id = user.id INSERT INTO posts … after_create Post#save before_update CFMPOHT@UP
    VTFS
    JOWFSTF@PG
    QPTUT ʹΑΓɺVTFSQPTUTʹΦϒδΣΫτׂ͕ Γ౰ͯΒΕ͍ͯΔͷͰ͜͜Ͱؔ࿈ઌͷอଘ ͕࣮ߦ͞ΕΔ
68. Post#save before_save User#save INSERT INTO users … post.user_id = user.id INSERT INTO posts … Post#save before_update after_create 1PTUͷCFGPSF@TBWFͷதͰ
    1PTU͕ӬଓԽ͞ΕΔ 
69. 1PTUͷCFGPSF@TBWFͷதͰ
    1PTU͕ӬଓԽ͞ΕΔ  Post#save before_save User#save INSERT INTO users … post.user_id = user.id INSERT INTO posts … Post#save before_update after_create
70. Post#save before_save User#save INSERT INTO users … post.user_id = user.id INSERT INTO posts … Post#save before_update 5*14
    ͔͜͜Β·ͨ6TFSTBWF͸
    ࣮ߦ͞Εͳ͍Α͏ʹͳ͍ͬͯ·͢ after_create
71. Post#save before_save User#save INSERT INTO users … post.user_id = user.id INSERT INTO posts … Post#save before_update CFGPSF@TBWFͷޙʹ CFGPSF@ DSFBUFcVQEBUF ͕࣮ߦ͞ ΕΔ͕ɺ͜͜Ͱ͸QPTU͸ӬଓԽ͞Εͯ ͍ΔͷͰCFGPSF@DSFBUFͰ͸ͳ͘ CFGPSF@VQEBUFʹͳΔ after_create
74. ΋͏ҰͭͷʮͲ͏ͯ͜͠͏ͳͬͨʁʯ
75. ͜ͷྫʹ͍ͭͯ͸
    IUUQTCMPHXJMMOFUJO FOUSZ
    ΛಡΜͰͶ
76. ͜͜·Ͱͷ·ͱΊ w ؔ࿈ઌΛࣗಈͰอଘ͢Δ࢓૊ΈͱɺJOWFSTF@PGʹΑΔ૒ํ޲ͷؔ࿈෇͚ʹΑ ͬͯҙਤ͍ͯ͠ͳ͍λΠϛϯάͰอଘ͕࣮ߦ͞ΕΔ͜ͱ͕͋Δ
78. 3BJMT͔Β௥Ճ͞Εͨઃఆ
79. ͜ͷ෦෼Λ࡟আͯ͠΋ࣗಈਪଌͯ͠
    ͘ΕΔΑ͏ʹͳΔ
80. ࠓճͷ݅ͷΑ͏ͳ*TTVF͕ෳ਺ग़ͯ ͖ͨͷͰσϑΥϧτͰ͸ແޮʹ
81. ͜ΕΒͷઃఆ͕ͳ͚Ε͹ʮͲ͏ͯ͠ ͜͏ͳͬͨʁʯʹ͸ͳΓʹ͍͘
82. ͜ΕΒͷઃఆͷϝϦοτͳΜͰ͔͢
84. QPTU͕ඥ͍͍ͮͯͳ͍ͷͰQPTU͸TBWF͞Εͳ͍
85. QPTU΋TBWF͞ΕΔʂ BVUPNBUJDBMMZ@JOWFSU@QMVSBM@BTTPDJBUJPO
    
    USVF
    Ͱ΋Α͍
87. VTFSCPPLTDSFBUFͩͱظ଴௨Γಈ͘
88. CPPLXSJUJOHTʹΦϒδΣΫτ͕ࣗಈ Ͱઃఆ͞Εͳ͍
89. ໌ࣔతͳJOWFSTF@PG΋͘͠͸
    BVUPNBUJDBMMZ@JOWFSU@QMVSBM@BTTPDJBUJPO
    
    USVF
    Ͱظ଴௨Γಈ͘
90. ͜͜·Ͱͷ·ͱΊ w ૒ํ޲ͷؔ࿈෇͚ͷର৅Λ޿͛Δͱɺҙਤ͠ͳ͍ڍಈʹ΋ͭͳ͕Δ͕ٯʹ ʮ͜͏ಈ͍ͯ΄͍͠ʯͱ͍͏ڍಈ΋࣮ݱͰ͖Δ
91. ૝ఆ2" w 2σϝϦοτ΋͋Δ͚ͲϝϦοτ΋͋Δ͜ͱ͕Θ͔ͬͨͷͰɺ૒ํ޲ͷؔ࿈ Λ΋ͬͱ༗ޮʹͯ͠Έ͍ͨͷͰ͕͢ɺ͏·͍͔͘ͳ͔ͬͨͱ͖ͷσόοά͕೉ ͦ͠͏Ͱ͢
    w "
    σόοά༻ͷπʔϧΛ࡞ͬͨͷͰྑ͚Ε͹࢖͍ͬͯͩ͘͞
95. ඪ४ग़ྗʹؔ࿈ͷอଘʹؔ͢Δॲཧ ͕ग़ྗ͞ΕΔ
96. "DUJWF
    3FDPSEͷϩάͱ߹Θͤͯ ͝׆༻͍ͩ͘͞
97. શମͷ·ͱΊ w Ͳ͏ͯ͜͠͏ͳͬͨʁͱ͍͏ྫ͔Β"DUJWF
    3FDPSEͷʮؔ࿈ઌΛࣗಈͰอଘͯ͘͠ΕΔػ ೳʯͱʮ൓ରଆͷؔ࿈ΛࣗಈͰઃఆͯ͘͠ΕΔػೳʯʹ͍ͭͯઆ໌͠·ͨ͠
    w ͲͪΒ΋ศརͳͷͰ͕͢ɺݱঢ়Ͱ͸ཱ྆͸೉ͦ͠͏
    w ͍͍ΞΠσΞ͋ͬͨΒ΄͍͠
    w ཧ۶͑͞Θ͔͍ͬͯΕ͹ͳʹ͔͋ͬͨͱ͖Ͱ΋ରॲͰ͖ΔͷͰɺΈͳ͞Μ͸΋͏େৎ෉Ͱ͢ Ͷ👍
    w Α͘Θ͔Βͳ͍ͻͱ͸͓ۙ͘ͷٕज़ސ໰·Ͱ͝૬ஊ͍ͩ͘͞
    w ͜ͷ͋ͱ4NBSU)3͞ΜͷϒʔεͰ"."ͯ͠·͢