Beyond the RuboCop Defaults

Rubyセミナー 東京 (https://www.ruby.or.jp/ja/news/20240702)

Transcript

1. ҏ౻
   ߒҰ
   
   &4.
   *OD ίϛολʔ௚఻
   3VCP$PQ࣮ફΨΠυ Beyond the RuboCop Defaults 3VCZηϛφʔ
   ౦ژ  Ϗδϣϯηϯλʔ඼઒
2. @koic w044ϓϩάϥϚʔ
   w3VCP$PQίΞνʔϜίϛολʔ
   wגࣜձࣾӬ࿨γεςϜϚωδϝϯτ
   &4.
   *OD
   ΤϯδχΞϦϯάϚωʔδϟʔ
   
   σΟεςΟϯάΠογϡυɾΤϯδχΞ
3. 3VCP$PQ
   DPSF
   EFWFMPQFST +0900 UTC+0200 +0300 +0800 -0400 ೥ؒͰਓҎ্ͷ։ൃऀ͕ؔΘΔϓϩδΣΫτ
5. Support OSS community
6. w !LPJD
   
   1BSTFS
   HFNίϛολʔ
   w !KVOL
   
   -SBNBίϛολʔ
   w !4)(".&-*/,4
   
   QBSTFZίϯτϦϏϡʔλ
   w !GVHBLLCO
   
   3#4ίϯτϦϏϡʔλ
   w ෦һืूதʂ ߏจղੳثݚڀ෦ IUUQTNBHB[JOFSVCZJTUOFUBSUJDMFT'PMMPX6Q,JSJTIJNB3VCZIUNM
8. ࠓ೔ͷ࿩
10. IUUQTSBJMTEFWFMPQFSDPNTVSWFZXIJDISVCZHFNTEPZPVMPWF
11. IUUQTSBJMTEFWFMPQFSDPNTVSWFZXIJDISVCZHFNTGSVTUSBUFZPVUIFNPTU
12. σϑΥϧτ͸࢖͍ ͮΒ͍͕ߏ੒͢Δ ͷ͸໘౗ͱ͍͏੠
13. मޗ͞Μ͔ΒͷΦϑΝʔ IUUQTUXJUUFSDPNNPSJNPSJIPHFTUBUVT ͜Ε͔Β3VCP$PQΛಋೖ͞ΕΔํ΍ɺಋೖ ͍ͯ͠Δ͚ΕͲ΋σϑΥϧτʹ͍ۙઃఆͰ 3VCP$PQͷ͍͍ͳΓͰ͔͑ͬͯಡΈʹ͍͘ Α͏ͳमਖ਼Λͯ͠͠·͍ͬͯΔํʹɺ͜͏͍ ͏෩ʹ࢖͏ͱ͍͍Αͱ͍͏ώϯτʹͳΔΑ ͏ͳ͓࿩Λ͍͚ͨͩΕ͹ͱࢥ͍ͬͯ·ͨ͠ ͭ·Γ3VCP$PQͱͷ޲͖߹͍ํͷڑ཭ײͱཧղ͠·ͨ͠
14. 3VCP$PQͱͷ
    ࣮ફͰͷ޲͖߹͍ํ
15. w ൃද࣌ͷ࠷৽ͷ3VCP$PQ
    Λલఏʹ͠ ͯ·͢ ຊτʔΫʹ͓͚Δόʔδϣϯ $ ruby -v ruby 3.4.0dev (2024-09-19T18:51:21Z master 2230ac4a28) +PRISM [x86_64-darwin23] $ bundle exec rubocop -V 1.66.1 (using Parser 3.3.5.0, rubocop-ast 1.32.3, running on ruby 3.4.0) [x86_64-darwin23] ࠓ೔͸όʔδϣϯґଘ௿Ίͷߟ͑ํΛத৺ͱͨ͠࿩Ͱ͕͢೦ͷҝ
16.  ྺ࢙ͱߟ͑ํ
     3VCP$PQͷ͸͡Ί͔ͨ
     ΦʔτίϨΫτ΁ͷߟ͑ํ
     3BJMT
     ͱ3VCP$PQ
     σϑΥϧτͷະདྷΛߟ͑Δ ໨࣍
17.  ྺ࢙ͱߟ͑ํ
18. w 3VCZ
    
    ೥݄೔ੜ·Ε
    w IUUQTCMBEFSVCZMBOHPSHSVCZMJTU
    w 3BJMT
    
    ೥݄೔ʹΞφ΢ϯε
    w IUUQTCMBEFSVCZMBOHPSHSVCZUBML
    w 3VCP$PQ
    
    ೥݄೔ʹTUίϛοτ
    w IUUQTHJUIVCDPNSVCPDPQSVCPDPQDPNNJUBGCFBE 3VCZ
    3BJMT
    3VCP$PQͷ஀ੜ
19. w 3BJMTʹΑΔϝΨώοτޚྱʹΑΓϕςϥϯ ͔ΒϏΪφʔ·Ͱ෯޿͍Ϣʔβʔ૚Λ࣋ͭ
    w 3VCZίϛολʔͰ΋޷Έ͕Θ͔ΕΔɺଟ༷ ͳॻ͖ํ͕Ͱ͖ΔॊΒ͔͞Λ࣋ͭݴޠ
    w ݸਓ΍૊৫ʹΑΔɺࢲ
    ͨͪ
    ͷߟ͑ͨ਺ଟ ͷ࠷ѪͷελΠϧ 3VCZͰͷελΠϧͷ౔৕
20. ఩ਓدΓʁࢻਓدΓʁ ఩ਓ ࢻਓ w νʔϜ։ൃ
    w ݎ͍ن໿
    w ౷Ұੑͷ९क w ݸਓ։ൃ
    w ؇͍ن໿
    w ଟ༷ͷड͚ೖΕ ౓߹͍
21. 3VC$PQཱ֬લͷ3VCZ
    ೥΁ͷެࣜ఩ֶ IUUQTEPDTSVCPDPQPSHSVCPDPQJOEFYIUNMQIJMPTPQIZ
22. w 3VCP$PQ͸3VCZ
    4UZMF
    (VJEFͷϥϯλΠϜ࣮૷
    w ॳظʹ໨ࢦͨ͠ͷ͸HPGNUతͳେ౷ҰϑΥϚολʔ
    w 3VCZίϛϡχςΟʹ͸ڝ߹͢ΔελΠϧ΍޷Έ͕ ͋Δ͜ͱʹؾͮ͘
    FH
    จࣈྻͷΫΥʔτ
    w 3VCZ
    4UZMF
    (VJEFΛσϑΥϧτͱͯ͠ɺҰൠతͱ ࢥΘΕΔελΠϧΛߏ੒Մೳʹ͢ΔΑ͏ʹͳΔ 3VCP$PQͷ఩ֶαϚϦʔ https://rubystyle.guide/
23. େ౷ҰͰ͖Δ͔໰୊ ఩ਓ ࢻਓ w ελΠϧͰ޷Έ͕෼͔ΕΔ
    w ఩ਓࢻਓͷ౓߹͍͕։ൃऀ͝ͱʹҟͳΔ
    w ͳΜͳΒ3VCZίϛολʔͰ΋ҟͳ͍ͬͯͨ ౓߹͍
24. ޷Έͷҧ͍Λड͚ ೖΕΔͱ͍͏఩ֶ
25. 3VCZ,BJHJ
     େ౷ҰϑΥʔϚολͷಋೖ͕೉͍͠ݴޠ͸ɺϢʔβʔʹѪ͞Ε͍͗ͯ͢Δઆ %BWF
    5IPNBT IUUQTXXXZPVUVCFDPNXBUDI W&$'(C+9Z*
26. ։ൃऀؒͰଟ༷ͳ ޷Έ͕͋ΔνʔϜ
27. l ҟͳΔ ελΠϧΛࠞͥͯ͠· ͏ͱɺ͘͢͝ಡΈʹ͍͘΋ͷʹ ͳͬͯ͠·͏ɻ ུ
    ͦ͜Ͱ͸ϓ ϩδΣΫτͷن໿ʹ͕ͨ͠͏Α ͏ʹͨ͠ɻҰ؏ੑͷํ͕େ੾ͳ ͜ͱ͔ͩΒͩɻ ݸਓݸਓͷ޷ΈͱҰ؏ੑ ʰϦʔμϒϧίʔυʱΑΓ
28. ͖Έ͸ݸਓͷ੒ޭͱνʔϜͷ੒ޭ
    ͲͪΒΛબͿʁ ಉ͡&DMJQTF
    *%&Λ࢖ͬͨ
    ϖΞϓϩάϥϛϯάͰΩʔόΠϯυ ͕͋Θͳ͍ɻͲ͏ࢥ͏ʁ @KKD asked @KentBeck KKD఻ฉ (2006೥ࠒ)
29. ਓؒؔ܎ͷຎࡲΛ ݮΒͨ͢Ίʹ࢖͏ ͷ্͕खͳ࢖͍ํ
30. ᘭ຤ͳCZ
    OBNFϨϏϡʔΛආ͚Δ IUUQTUXJUUFSDPNPOLTUBUVT
31. ΞδϟΠϧͳνʔϜ։ൃʹֶͿ w ਓؒ͸܁Γฦ͠ͷ ࢦఠΛ͢Δͷ΋͞ ΕΔͷ΋ۤख
    w ίʔυͷຊ࣭తͳ ໰୊ʹਓ͕ؒ஫ྗ Ͱ͖Δߏਤʹ͢Δ IUUQTPCKFDUDMVCKQEPXOMPBE fi MFTQG1SPKFDU'BDJMJUBUJPO7BMVF1SJODJQMFQEG ʰϓϩδΣΫτϑΝγϦςʔγϣϯՁ஋ͱݪଇฤʱΑΓ
32. ιϑτ΢ΣΞ։ൃͰͷ3VCP$PQͷҐஔ෇͚ʹ΋ͳΔͩΖ͏ IUUQTBHJMFNBOJGFTUPPSHJTPFONBOJGFTUPIUNM
33. w 3VCP$PQͷσϑΥϧτͷίʔσΟϯάن໿ ͱ͋Θͳ͚Ε͹ΧελϚΠζͰ͖Δ
    w طʹνʔϜͷจԽ͕͋Ε͹ͦΕΛଚॏͰ͖Δ
    w ྫ͑͹.FUSJDT෦ॺͷ$PQʹैͬͯɺٯʹಡ ΈͮΒ͘ͳΔͷͰ͋Ε͹ɺແཧʹͦͷσϑΥ ϧτʹै͏ඞཁ͸ͳ͍ 3VCP$PQσϑΥϧτ͸܅ओͰ͸ͳ͍
34.  3VCP$PQͷ͸͡Ί͔ͨ
35. w ࣗ෼ͨͪͷελΠϧ͕ॏཁͳ৔߹͸ɺ %JTBMCFE#Z%FGBVMU
    USVFʹઃఆͯ͠ɺ
    ݕ஌͍ͨ͠ϧʔϧΛ&OBCMF
    USVFʹ͢Δઓུ
    w ελΠϧ΁ͷؾ͕࣋ͪগͳ͍ϝϯόʔߏ੒ͷ ৔߹ɺ3VCP$PQσϑΥϧτ͔Β߹Θͳ͍΋ ͷΛ&OBCMF
    GBMTF͋Δ͍͸มߋ͢Δઓུ ͸͡Ί͔ͨ͸νʔϜߏ੒ʹΑΔ
36. %JTBCMFE#Z%FGBVMU
    USVF 3VCP$PQͷσϑΥϧτߏ੒ SE
    1BSUZͷϓϦηοτ ϧʔϧ͕ݫ͘͠ͳΔ طଘίʔυ͕͋Δͱ͖ͷಋೖͷ೉қ౓
    ҧ൓͕ݕ஌͞ΕΔਪఆྔ ࣗ෼ͨͪͷϧʔϧ ؾʹೖΒͳ͍ϧʔϧΛ
    ΧελϚΠζ͢Δ ͋ͱͰߏ੒͢Δ ྫ͑͹1VMM
    3FRVFTUͰͷϨϏϡʔʹ
    ج͍ͮͯಉ͡ࢦఠ͕ͳ͍Α͏ߏ੒͢Δ
    %3: ⭐ ⭐ ⭐ ⭐
    
    ελʔτ஍఺ SE
    QBSUZ੡ͷϓϦηοτ ͷ··Ͱ΋ྑ͍͠ߏ੒
    ͯ͠΋ྑ͍ ࠷খߏ੒Ͱͷ࢝Ίํͷྫ 4UBOEBSE
    3VCZ
    ߏ੒ෆՄ
    SVCPDPQSBJMT@DPO fi H
    ߏ੒Մ
    SVCPDPQSBJMTPNBLBTF
    ߏ੒Մ
37. ߏ੒ͷ࣮ફͱݟฉ
38. w 3VCP$PQࣗମͰ3VCP$PQ͕࢖ΘΕ͍ͯΔ
    w σϑΥϧτʹ͍ۙઃఆ͕ద༻͞Ε͍ͯΔ
    w ͔ͭͯ.FUSJDT"CD4J[F͸.BY
    ͕ͩͬͨ ʹߋ৽͞Εͨ
    SVCPDPQSVCPDPQ
    w σϑΥϧτ஋͕ଥ౰ͳదਖ਼஋ͱ͸ݶΒͳ͍ ߏ੒ྫ
    SVCPDPQSVCPDPQ
39. w ೥Ͱ ਓͷ։ൃऀ͕ؔΘ͍ͬͯΔେܕ ϓϩμΫτ
    w %JTBCMFE#Z%FGBVMU
    USVFͱ͞Ε͍ͯΔ
    w ଟ਺͔Βͷ13ʹରͯ͠ɺϨϏϡʔࢦఠΛͨ͠ $PQΛ༗ޮʹ͢Δ܏޲ʹ͋Δ
    w ಉ͡ࢦఠΛ܁Γฦ͠ਓ͕ߦΘͳ͍ͨΊͷ࢖͍ํ ߏ੒ྫ
    SBJMTSBJMT
40. w UNN͔ΒϝϯςφʔΛҾ͖ܧ͍ͩϓϩμΫτ
    w -41Λ࢖͍͔ͨͬͨ͜ͱ΋͋Γಋೖ
    w %JTBCMFE#Z%FGBVMU
    USVFͱ͍ͯ͠Δ͕޷ΈͰ ෼͔ΕΔ4UZMF෦ॺҎ֎͸֓Ͷ༗ޮԽ͍ͯ͠Δ
    w 4UZMF͸طଘίʔυଚॏΛجຊͱͯ͠ɺܯࠂͷ ͏ͪؾʹͳΔ΋ͷͷΈΛ༗ޮԽͨ͠ ߏ੒ྫ
    UNNUFTURVFVF
41. w େࡕ3VCZձٞ޲͚ʹεΫϥον࣮૷ͨ͠(FN
    w /FX$PQT
    FOBCMFͰ৽͍͠$PQΛ༗ޮԽ
    w .FUSJDT෦ॺ͸·͖ͬ͞ʹ&OBCMFE
    GBMTFʹͨ͠
    w -JOU"NCJHVPVT0QFSBUPS1SFDFEFODF͸ઈڐͷ $PQͳͷͰແޮԽ
    VQTUSFBNͰQFOEJOH
    w ࢖ͬͯ߹Θͳ͍4UZMFߏ੒Λ͍͔ͭ͘มߋͯ͠Δ ߏ੒ྫ
    LPJDNJOJGZSC
42. w ࣗ෼͕ΧελϚΠζߏ੒ͯ͠ΔϓϩδΣΫτྫ
    w SVCPDPQSBJMT@DPO fi HϕʔεͰͷɺӬ࿨ۘ੡
    ࣾ಺FTBJPڞ༗
    ϧʔϧͷԣஅద༻ͳͲ
    w ྑ໊͍લ͕෇͍ͨΒ(FNԽͯ͠ྑ͍͚ΕͲ
    w ΦϯϥΠϯٕज़ސ໰αʔϏεͱ͍͏΋ͷ͕͋Δ ͨΊɺ͝׆༻͍ͩ͘͞ ߏ੒ྫ
    ͓࢓ࣄϓϩδΣΫτྫ
43. w Ͳͷߏ੒ྫ΋σϑΥϧτͷ··࢖͍ͬͯͳ͍
    w 3VCP$PQࣗମ͑͞΋ʂ
    w ॻ͖ͮΒ͍ɺ͔͑ͬͯಡΈͮΒ͍ͱࢥͬͨΒ 3VCP$PQͷઃఆΛٙͬͯΈΔͷ΋ͻͱͭ
    w 3VCP$PQʹै͏ͷ͕໨తʹͳΔͱຊ຤స౗
    w ͢ͰʹνʔϜͷจԽ͕͋Ε͹ͦΕΛଚॏ͢Δ ӡ༻͕࠷্ྲྀ
44. w ςετΧόϨοδ΁ͷύϥυοΫεͷΑ͏ʹ ܯࠂΛফ͢͜ͱ͕໰୊ղܾͱ͸ݶΒͳ͍
    w .FUSJDT"CD4J[Fͷܯࠂফ͕͠໨తʹͳΓɺ ຊ࣭తͰͳ͍ϝιουநग़ΛߦͬͨΓɺ
    -BZPVU-JOF-FOHUIආ͚ʹ໊લΛ୹ͯ͘͠ Χϥϑϧͳ໋໊ΛࣦΘͳ͍Α͏Ͱ͖ΔͱΑ͍ ܯࠂফ͠Λ໨తͱͨ͠ίʔυมߋ͠ͳ͍
45. मޗ͞Μ͔ΒͷΦϑΝʔ IUUQTUXJUUFSDPNNPSJNPSJIPHFTUBUVT ͜Ε͔Β3VCP$PQΛಋೖ͞ΕΔํ΍ɺಋೖ ͍ͯ͠Δ͚ΕͲ΋σϑΥϧτʹ͍ۙઃఆͰ 3VCP$PQͷ͍͍ͳΓͰ͔͑ͬͯಡΈʹ͍͘ Α͏ͳमਖ਼Λͯ͠͠·͍ͬͯΔํʹɺ͜͏͍ ͏෩ʹ࢖͏ͱ͍͍Αͱ͍͏ώϯτʹͳΔΑ ͏ͳ͓࿩Λ͍͚ͨͩΕ͹ͱࢥ͍ͬͯ·ͨ͠ σϑΥϧτͱͷڑ཭ײͱΧελϚΠζʹ͍ͭͯ఻Θ͖ͬͯͨʁ
46. ίʔυϕʔε͕
    େ͖͍ରॲࣄྫ
47. w SVCPDPQ
    BVUPHFODPO fi HͰޙճ͠ʹ͢Δ
    w SVCPDPQ
    EJTBCMFVODPSSFDUBCMFΛ࢖ͬͯ ΦʔτίϨΫτΛͭͭ͠ɺαϙʔτ͞Ε͍ͯ ͳ͚Ε͹
    SVCPDPQUPEPΛࣗಈ෇༩ͤ͞Δ
    w ͜ΕΒެࣜػೳͰ͸ͳ͘HSZ
    HFNΛ࢖͏ͱ
    ͍͏બ୒΋͋Δʁ ్தಋೖͷ࢝Ίํ͍Ζ͍Ζ Ԧಓฤʁ
48. w SVCPDPQ
    GPSNBU
    P ff FOTFTΛ࢖ͬͯܯࠂͷ ଟ͍ϥϯΩϯάॱʹΦʔτίϨΫτΛߟ͑Δ
    w ಉ྅TXBNQͱͷPO͔ΒΦʔτίϨΫτ ͷαϙʔτ༗ແ΋දࣔ͞ΕΔΑ͏ʹͨ͠ Өڹ͕େ͖͘ॱʑʹద༻͍ͨ͠ͱ͍͏ཁ๬
49. w 
    SVCPDPQEJTBCMF
    .FUSJDT"CD4J[Fͱ͍ͬ ͨίϝϯτΞϊςʔγϣϯΛ࢖͑Δ
    w SVCPDPQZNMͷ&YDMVEFࢦఆͯ͠আ֎ɺ͋Δ ͍͸SVCPDPQ@UPEPZNMͷ&YDMVEFࢦఆͰҰ ࣌తʹআ֎Ͱ͖Δ ։ൃӡ༻࣌͸ແཧͤͣճආͰ͖Δ
50. EJTBCMF UPEP ίϝϯτͷτϨʔυΦϑ def complex_method # rubocop:disable Metrics/AbcSize complex_code ... end w ߦ຤ίϝϯτ͸FOBCMFίϝϯτ͕ෆཁ͕ͩɺHJU
    CMBNFʹऑ͍ EJTBCMFίϝϯτΛফͤΔݟཱ͕ͯͳ͍৔߹ʹ࢖͑Δɻ
    ࣮૷͕มΘΓͦ͏ͳ"CD4J[Fʹ͸ෆ޲͖ɻ # rubocop:todo Metrics/AbcSize def complex_method complex_code ... end # rubocop:enable Metrics/AbcSize w ൣғίϝϯτ͸HJU
    CMBNFʹڧ͍൓໘ͰFOBCMFίϝϯτ͕ඞཁ EJTBCMFίϝϯτΛফͤΔݟཱ͕ͯ͋Δ৔߹ʹ༗༻ɻ
    ಛʹҙࢤΛ͍ࣔͨ͠৔߹͸SVCPDPQUPEPͰ໌ࣔɻ
51. w ಉ͡$PQʹର͢ΔSVCPDPQEJTBCMFίϝϯτ ͕සग़͍ͯ͠ΔΑ͏Ͱ͋Ε͹ɺͦ΋ͦ΋ͦͷ $PQΛ༗ޮԽ͍ͯ͠Δҙຯ͸͋Δ͔ʁ
    w SVCPDPQZNMͰɺ౰֘$PQΛ&OBCMF
    GBMTF ʹ͢Δݕ౼͸ͻͱͭͷखཱͯ ͦ΋ͦ΋࿦
52.  ΦʔτίϨΫτ΁ͷߟ͑ํ
53. w rubocop -aΦϓγϣϯ͸ΦʔτίϨΫτʹ Αͬͯඇޓ׵͕ੜ͡ͳ͍ ҆શͳ $PQʹݶఆ͠ ࣮ͯߦ͢Δ w rubocop -AΦϓγϣϯ͸ɺِཅੑɺҙਤత ʹΑΒͣৼΔ෣͍͕มΘΓ͏Δɺ$PQΛؚΉ͢ ΂ͯͷ ҆શͰͳ͍ ΦʔτίϨΫτΛ࣮ߦ͢Δ छྨͷΦʔτίϨΫτ
54. w ޡղΛڪΕ͍ͣ͏ͳΒɺΦʔτίϨΫτ͸
    ޿ٛͷϦϑΝΫλϦϯάࢧԉπʔϧ
    w ΦʔτίϨΫτΛ࢖͏৔߹͸ςετॏཁ
    w ϦϑΝΫλϦϯά͸ج൫ͱͳΔ࠶ݱՄೳͳ ςετίʔυ͕͋ͬͯ੒Γཱͭ ϦϑΝΫλϦϯάͷࣗಈԽ ΦʔτίϨΫτͰγεςϜ͕յΕͯྦ໨ʹͳΒͳ͍Α͏ʹ
55. w ΦʔτίϨΫτͷͨΊʹ3VCP$PQΛ࢖ͬͯ ͍Δ
    w ෳࡶͳίʔυΛΦʔτίϨΫτ͍ͯ͢͠͝
    w ΦʔτίϨΫτͰյΕΔ͜ͱ͕͋Δ ΦʔτίϨΫτ΁ͷϢʔβʔͷ੠
56. w ख࡞ۀͰมߋ͢Δͷ͸େมͳͷͰɺ౰ॳ͸ खܰͳαϙʔτఔ౓Ͱఏڙ͍ͯ͠Δͭ΋Γ ͩͬͨ
    ιʔεࣦ೦ͷCCBUTPWஊ
    w ΦʔτίϨΫτΛͦ͜·Ͱ৴༻͠ͳ͍ํ͕ ྑ͍ͱࢥ͍ͬͯͯɺSVCPDPQ
    Bͷίʔυ͕ ਖ਼ٛͱ͍͏ѻ͍ʹ͢΂͖Ͱͳ͍
    ࢲͷݟղ ΦʔτίϨΫτ΁ͷ։ൃऀͷ੠
57. w ΦʔτίϨΫτίʔυΛਖ਼͍͠ͱܾΊͣɺ ࣗ෼ͷظ଴͢Δίʔυͱҧ͑͹खΛೖΕΔ
    w ςϯϓϨʔτੜ੒͞Εͨίʔυ΍ɺίϚϯ υϓϩϯϓτʹΑͬͯ"*Ͱੜ੒͞Εͨίʔ υ͸ਆ੟ෆՄ৵ͷίʔυͰ͸ͳ͍ͷͱಉ͡ ΦʔτίϨΫτίʔυΛۚՊۄ৚ʹ͠ͳ͍ πʔϧ͸ϓϩηεʹ͓͚Δબ୒ͷͻͱͭͰ͋ΓɺϓϩδΣΫτʹ࢒Δͷ͸݁Ռͷίʔυ
58. w -BZPVU-JOF-FOHUIͷΦʔτίϨΫτʹ ΑͬͯɺંΓฦ͞ΕͨҎԼͷίʔυ͸ಡΈ ΍͍͔͢Ͳ͏͔ߟ͑Δ͜ͱ͕Ͱ͖ΔͩΖ͏ ΦʔτίϨΫτ͞Εͨίʔυ΁ͷٙ໰ ΦʔτίϨΫτͷ࣮૷౎߹ ͰͷંΓฦ͕͠ద༻͞Εͯ ͍Δ͚ͩͳͷ͕֞ؒݟ͑Δ
59. w Bͱ"ͷ͍ͣΕʹͯ͠΋ɺͦ΋ͦ΋ͷΦʔ τίϨΫτࣗମͷόάͱ͍͏ͷ͸ɺେ͖͘ ҎԼͷͭ͋Δ
    3VCP$PQ΋ϓϩάϥϜ
    w *OWBMJE
    4ZOUBY΁ͷίʔυมߋ͸ৗʹόά
    w ޓ׵ੑΛظ଴ͯ͠rubocop -aΛ࢖ͬͨͷ ʹৼΔ෣͍͕มΘΔίʔυ΁ͷมߋ͸όά ΦʔτίϨΫτͷόάՄೳੑ
60. l ϦϑΝΫλϦϯάΛߦ͏ͱ͖ɺ ࠷ॳʹ͢Δ͜ͱ͸ৗʹಉ͡Ͱ ͢ɻର৅ͱͳΔίʔυʹ͍ͭͯ ͖ͪΜͱͨ͠ςετ܈Λ࡞Γ্ ͛Δ͜ͱͰ͢ɻςετ͸ෆՄܽ Ͱ͢ɻ ੬͖΋ͷΑɺೊͷ໊͸ιϑτ΢ΣΞ ʰϦϑΝΫλϦϯάୈ൛ʱΑΓ
61. w ΦʔτίϨΫτ͕࠷΋ྗΛൃش͢Δ৔ॴ͸ ϦΞϧλΠϜॲཧͷ-41ʹͳͬͨ
    ࢲݟ
    w ಛʹίʔυϑΥʔϚολʔͱͯ͠ͷ-41͸ ։ൃମݧΛม͑Δ
    ΋ͪΖΜҧ൓ݕ஌΋
    w 3VCP$PQ΍4UBOEBSEͷ૊ΈࠐΈ-41
    SVCZMTQͳͲ͕͋Δ ࣌୅͸-41ͰͷΦʔτίϨΫτ
62. -41σϞ
63. 
    ϑΥʔϚοτࡁΈίʔυ ·ͣେ͖ͳҧ࿨ײ͕ͳ͍Ͱ͋Ζ͏ϑΥʔϚοτ͞ΕͨίʔυΛݟͯΈ·͢
64. 
    ϑΥʔϚοτΛ่͠·͢ ࣍ʹ͜Μͳίʔυ͕དྷͨΒࠔΔͱɺಡΊͳ͍ͱ͸͜͏͍͏ͳίʔυΛࣔ͠·͢
65. 
    -41ʹΑΔϑΥʔϚοτ ࠷ޙʹ-41Λ࢖ͬͯɺΤσΟλ্ͰϑΥʔϚοτ͞ΕΔ͜ͱΛݟͯΈ·͢
66. w ίʔσΟϯάத͸-41ͰฤूதϑΝΠϧΛ ϦΞϧλΠϜॲཧͯ͠ɺԣஅͨ͠Ұׅॲཧ Λ͍ͨ࣌͠͸ίϚϯυϥΠϯͱ࢖͍෼͚Δ
    w ؀ڥࠩҟ͕ى͖ͳ͍໳൪ͱͯ͠$*Ͱ࢖͏
    w ฤू࣌ΦʔτίϨΫτͷ-41͸SVCPDPQ
    B ͱ͍͏ෆཁͳ࡞ۀϩάίϛοτආ͚ʹͳΔ -41ͱίϚϯυϥΠϯͱ$*
67.  3BJMT
     ͱ3VCP$PQ
68. SBJMTSBJMT "EE
    B
    WFSZ
    CBTJD
    3VCPDPQ
    CZ
    EFGBVMU
69. %))ͷ͓ؾ͕࣋ͪ٧·͍ͬͯΔ ࠷ऴతʹ3VCPDPQΛड͚ೖΕ·͕ͨ͠ɺελΠϧͷڧ੍͸ඇৗʹܰ͘อͭ ͜ͱ͕৚݅Ͱ͢ɻ͜Ε͸ࣗసंஔ͖৔ͷٞ࿦ʹͳΓ͔Ͷͳ͍ͷͰɺݸਓత Ͱಠࣗͷ޷Έʹج͍ͮͯελΠϧͷڧ੍Λ཈͑Α͏ͱߟ͍͑ͯ·͢ɻ
70. $ rails new example && cd $_ $ rails new example && cd $_ $ cat Gemfile | grep rubocop # Omakase Ruby styling [https://github.com/rails/rubocop gem "rubocop-rails-omakase", require: false 3BJMT
    ͰͷSBJMT
    OFX $ rails new example && cd $_ $ cat Gemfile | grep rubocop # Omakase Ruby styling [https://github.com/rails/rubocop gem "rubocop-rails-omakase", require: false $ cat .rubocop.yml # Omakase Ruby styling for Rails inherit_gem: { rubocop-rails-omakase: rubocop.yml } # Overwrite or add rules to create your own house style # # # Use `[a, [b, c]]` not `[ a, [ b, c ] ]` # Layout/SpaceInsideArrayLiteralBrackets: # Enabled: false
71. SVCPDPQSBJMTPNBLBTF w %))ۘ੡ͷ
    ઃఆϑΝΠϧ
    w ࢖͍ํʹ͍ͭͯ PNBLBTF
    🤔
    w HPGNUͷΑ͏ͳ ສਓૂ͍Ͱͳ͍
72. w 3VCP$PQͷσϑΥϧτΑΓ΋ɺ͸Δ͔ʹ ܰྔͳɺग़ൃ఺ͱ΋ͳΓ͏Δઃఆ
    w SBJMTSBJMTϦϙδτϦͷSVCPDPQZNMઃఆ ͱҟͳΔ
    SBJMTSBJMTͷߏ੒͸தྔڃ
    w ͭ·ΓϑϨʔϜϫʔΫϨΠϠʔͱΞϓϦ έʔγϣϯϨΠϠʔͰߏ੒͸ဃ཭͍ͯ͠Δ બ୒ࢶͷͻͱͭͱͳΔߏ੒
73. %JTBCMFE#Z%FGBVMU
    USVF 3VCP$PQͷσϑΥϧτߏ੒ SE
    1BSUZͷϓϦηοτ ϧʔϧ͕ݫ͘͠ͳΔ طଘίʔυ͕͋Δͱ͖ͷಋೖͷ೉қ౓
    ҧ൓͕ݕ஌͞ΕΔਪఆྔ ࣗ෼ͨͪͷϧʔϧ ؾʹೖΒͳ͍ϧʔϧΛ
    ΧελϚΠζ͢Δ ͋ͱͰߏ੒͢Δ ྫ͑͹1VMM
    3FRVFTUͰͷϨϏϡʔʹ
    ج͍ͮͯಉ͡ࢦఠ͕ͳ͍Α͏ߏ੒͢Δ
    %3: ⭐ ⭐ ⭐ ⭐
    
    ελʔτ஍఺ SE
    QBSUZ੡ͷϓϦηοτ ͷ··Ͱ΋ྑ͍͠ߏ੒
    ͯ͠΋ྑ͍ ࠷খߏ੒Ͱ࢝ΊΔબ୒ࢶͷͻͱͭ 4UBOEBSE
    3VCZ
    தྔڃ
    SVCPDPQSBJMT@DPO fi H
    தྔڃ
    SVCPDPQSBJMTPNBLBTF
    ܰྔڃ
74. w SVCPDPQSBJMTPNBLBTFຊମͦͷ΋ͷ΁ͷఏҊ ͸/P
    5IBOL
    ZPVͱ͞Ε͍ͯΔ
    w ͦͷ··࢖ͬͯྑ͍͠ΞϓϦଆͰߋ৽ͯ͠΋ྑ͍
    w ݩ͋ΔจԽʹΑΔϧʔϧ͕͋Ε͹ɺؾʹͤͣε ΫϥονͰઃఆΛ࡞ΔͳΓ࣋ͬͯ͘ΔͳΓ͢Ε͹ ྑ͍ SVCPDPQSBJMTPNBLBTFͷಛ௃ ݸਓతʹ%))ͷ3VCZͷهड़ྗͷߴ͞΁ͷϦεϖΫτͱݱ࣮ͷଥڠ఺Λײ͡Δ
75. $ rails new example && cd $_ $ cat Gemfile | grep rubocop # Omakase Ruby styling [https://github.com/rails/rubocop gem "rubocop-rails-omakase", require: false $ cat .rubocop.yml # Omakase Ruby styling for Rails inherit_gem: { rubocop-rails-omakase: rubocop.yml } # Overwrite or add rules to create your own house style # # # Use `[a, [b, c]]` not `[ a, [ b, c ] ]` # Layout/SpaceInsideArrayLiteralBrackets: # Enabled: false 3BJMTͷPNBLBTF͸Ͳ͏ʁ Ͳ͏ͳΜͩΖ͏͔ʁͱ͍͏
    σϑΥϧτ͚ͩΕͲɺ
    Ϣʔβʔ΁ઃఆΛଅͨ͢Ί
    Θ͟ͱ΍ͬͯΔʁ σϑΥϧτ
76. SVCPDPQSBJMTPNBLBTF
    Y
    34QFD w PNBLBTF͸σϑΥϧτSVCPDPQNJOJUFTU
    w SVCPDPQZNMʹSFRVJSF
    SVCPDPQSTQFD ͱ34QFD
    &OBCMFE
    USVF
    Λ௥ه͢Ε͹ɺ σϑΥϧτ༗ޮͷ34QFD
    $PQT͕༗ޮԽ inherit_gem: { rubocop-rails-omakase: rubocop.yml } require: - rubocop-rspec RSpec: Enabled: true ಉ྅͔Βࣾ಺4MBDLͰ࣭໰͕͋ͬͨ಺༰
77. w 5IF
    3BJMT
    %PDUSJOFͷͻͱͭ
    w ϑϨʔϜϫʔΫ͕͍͍ࣔͩͨ͢ ্ख͍͘͘PNBLBTFͱ͍͏Α ΓɺSVCPDPQSBJMTPNBLBTF ͸ϢʔβʔʹؙͬͱPNBLBTF ͍ͯ͠Δײ͕͋Δ(JO[BSCઆ
    w ͭ·Γɺ3VCZίʔσΟϯάε λΠϧͷσϑΥϧτͮ͘Γ͸೉ ͍͠
    3VCZѪͷߴ͞ 5IF
    NFOV
    JT
    PNBLBTF
78. 3BJMT
    Y
    3VCP$PQ
    1SP
    5JQT
79. CJOSBJMT
    HͰίʔυੜ੒࣌ʹࣗಈमਖ਼ - #config.generators.apply_rubocop_autocorrect_after_generate! + config.generators.apply_rubocop_autocorrect_after_generate! w DPO fi HFOWJSPONFOUTEFWFMPQNFOUSCͰ ίϝϯτΞ΢τ͞Ε͍ͯΔ BQQMZ@SVCPDPQ@BVUPDPSSFDU@BGUFS@HFOF SBUFΛ༗ޮʹ͢ΔCJOSBJMT
    Hͨ͠ίʔυʹ ରͯ͠ΦʔτίϨΫτద༻ͱͳΔ SBJMTSBJMTʹσϑΥϧτແޮͷཧ༝͸ৄ͍͕͠جຊ༗ޮͰྑ͍ͱࢥ͏
80. (JU)VC
    "DUJPOTͰͷσϑΥϧτ$*ઃఆ w ݕ஌ͨ͠ҧ൓Λ(JU)VCʹίϝϯτ͢Δ CJOSVCPDPQ
    G
    HJUIVCΦϓγϣϯ͕
    σϑΥϧτͰࢦఆ͞Ε͍ͯΔ # .github/workflows/ci.yml jobs: lint: # snip - name: Lint code for consistent style run: bin/rubocop -f github ͜Ε΋·ͨ޷Έ͕෼͔ΕΔ͔΋͠Εͳ͍
81. 3BJMT
     ͷσϑΥϧτ-41 w SBJMT
    OFXͷEFWDPOUBJOFSΦϓγϣϯͰ HJUIVCDPNSBJMTEFWDPOUBJOFSϦϙδτ Ϧ͕ݩʹͳ͍ͬͯΔΠϝʔδ͕࢖ΘΕΔ
    w 3BJMT
    %FW
    $POUBJOFSʹࠝแ͞Ε͍ͯΔ TIPQJGZSVCZMTQ͕࢖ΘΕΔ࢓૊Έʹͳͬ ͍ͯΔ ೖ໳ऀ΁ͷηοτΞοϓʹ΋қ͍࣌͠୅
82.  σϑΥϧτͷະདྷΛߟ͑Δ
83. मޗ͞Μ͔ΒͷΦϑΝʔ IUUQTUXJUUFSDPNNPSJNPSJIPHFTUBUVT ͜Ε͔Β3VCP$PQΛಋೖ͞ΕΔํ΍ɺಋೖ ͍ͯ͠Δ͚ΕͲ΋σϑΥϧτʹ͍ۙઃఆͰ 3VCP$PQͷ͍͍ͳΓͰ͔͑ͬͯಡΈʹ͍͘ Α͏ͳमਖ਼Λͯ͠͠·͍ͬͯΔํʹɺ͜͏͍ ͏෩ʹ࢖͏ͱ͍͍Αͱ͍͏ώϯτʹͳΔΑ ͏ͳ͓࿩Λ͍͚ͨͩΕ͹ͱࢥ͍ͬͯ·ͨ͠ ͜͜·Ͱͷ࿩Λ౿·͑ͯσϑΥϧτͷະདྷΛۭ૝ͯ͠Έ·͢
84. w σϑΥϧτ͕ݫ͗͢͠Δ
    w ݫ͍͠కΊ෇͚͕ྑ͍ͱ͍͏੠΋͋Δ
    w σϑΥϧτͰબ୒͞ΕͨελΠϧ͕͋Θͳ͍
    w ରۃ͕࣠͋Δ΋ͷ͸೉͍͠ɻྫ͑͹γϯάϧΫΥʔτ೿ͱμϒϧ ΫΥʔτ೿ͷ߅૪͸ऴΘΒͳ͍ɻ3VCZ͕޷͖ͳͷ͸Θ͔ͬͨɻ
    w σϑΥϧτͰ༗ޮͷϧʔϧ͕ଟ͗͢Δ
    w ͜Ε͸ͦ͏ɻؤுͬͯݮΒ͢׆ಈΛ͍ͯ͠Δ͕ɺ͍ͨ΁Μɻ σϑΥϧτ΁ͷݱ࣮ͷ੠
85. ͍ͪͲσϑΥϧτʹ ͳͬͨ΋ͷ͸खڧ͍
86. ϝϯςφʔ͙͠͞
87. .*/"48"/
    ΁ͷෛ୲ΛݮΒ͢ ඞཁҎ্ͷΧελϚΠζઃఆ
88. w ཧ૝ͱ͢ΔσϑΥϧτ͸5IF
    3BJMT
    %PDUSJOF ͷʮ5IF
    NFOV
    JT
    PNBLBTFʯͷੈք؍
    w ͍͍ͩͨͷ৔߹͸σϑΥϧτͰ͏·͍͘͘
    w ͨ·ʹ
    ͋Θͳ͍෦෼͸ΧελϚΠζͰ͖Δ
    w SVCPDPQSBJMTPNBLBTF͸੯͍͠ શͯԕ͖ཧ૝ڷ
89. Ͳ͏͍͏ߟ͑ํʹ ࢲ͸ج͍ͮͯΔʁ
90. w ίϯτϦϏϡʔλ΁ͷ
    Ϛʔδ΁ͷ
    ຬ଍ײ Ͱ͸ͳ͘ɺϓϩμΫτ΁ͷϢʔβʔͷ࢖͍উ खΛॏࢹ͢Δ
    w ͨͱ͑͹ಛఆͷϓϩδΣΫτͷ޷Έ͕σϑΥ ϧτ޲͖ͱ͸ݶΒͳ͍ $PQ
    DPQͱ͍͏ϝλ׆ಈ Ϋϩʔζ͸৺ॏ͍Ͱ͕͢Ϣʔβʔͷ൵໐Λ๷͙ͷΛ༏ઌ
91. ݱߦσϑΥϧτ΁ͷݟղ ఩ਓ ࢻਓ w σϑΥϧτϧʔϧ͸΋ͬͱ؇ͯ͘ྑ͍
    w ΋ͬͱࣗ༝౓͕͋Δͱࣗવຯ
    ָ͠͞
    ͋Δ
    w ʮݫ͗͢͠ͳʯϧʔϧͷఏҊ͸͓فΓ͢Δ ౓߹͍
92. w ϧʔϧͱͯ͠ݫ͗͢͠Δ
    w ಠࣗϧʔϧײ͕ڧ͍
    w ِཅੑ͕ଟ͍͜ͱ͕ࣗ໌ͳ΋ͷ
    w ϚʔδޙʹϢʔβʔͷ൵໐͕େ͖ͦ͏ͳ΋ͷ 3VCP$PQຊମʹड͚ೖΕʹ͍͘৽ϧʔϧ ͜ΕΒ͸ຊମͰ͸ͳ͘SEύʔςΟʔͰͷެ։Λ঑Ί͍ͯΔ ఏҊऀͰ͸ͳ͘ଟ༷ͳਓ͕ ࢖͏σϑΥϧτͱͯ͠࢖͍ উख͕ଥ౰ͳఏҊ͔Ͳ͏͔
93. w 3VCP$PQͱͯͦ͠ͷ··ͷσϑΥϧτͰ ͍͍ײ͡ʹ࢖͑ΔઃఆΛ༻ҙ͍ͨ͠
    ເ
    w SVCPDPQSBJMTPNBLBTF͸ྑׂ͍Γ੾Γͷ ͻͱ͚ͭͩͲ5IF
    %FGBVMUͰ͸ͳ͍
    w HPGNUͷΑ͏ͳ5IF
    %FGBVMUΛ༻ҙͰ͖ͳ ͍ͷͰ͍͔ͭ͘ͷΦϓγϣϯΛఏڙʁ σϑΥϧτ͸ॏཁ͚ͩͲ
94. " ΑΓྑ͍σϑΥϧτΛٻΊͯ
95. w ϓϩάϥϚʔͷϝϞϦ؅ཧ͔ॲཧܥͷ($ͷ
    ୒Ͱͳ͘ɺίϯύΠϥͰϝϞϦ؅ཧΛղܾ ͢Δ3VTUͷಓ
    w ੩తܕ෇͚ͷܕԸܙ͔ಈతܕ෇͚ͷखܰ͞ͷ
    ୒Ͱͳ͘ɺܕఆٛϑΝΠϧͰ྆औΓΛ໨ࢦ ͢3#4ͷಓ ୈࡾͷղܾ
96. w HPGNUͷΑ͏ͳ୒ҰϑΥʔϚοτͱϢʔβʔ ΧελϜͷߏ੒ͷ୒Ͱ͸ͳ͘ɺͳΜͱͳ͘ ೲಘײͷ͋Δʮ͍͍ͩͨ͏·͍͘͘ߏ੒ʯ
    w 3VCP$PQͰݕ౼͞ΕͯΔϓϦηοτ͕ͦΕ ʹ͍͕ۙʮ୭͔ͷዞҙੑʯ͔Βൈ͚ग़ͤͳ͍ 3VCP$PQͰ΋ୈࡾͷղܾ
97. Ѫ৘͋Δዞҙੑ͕ ղܾ΁ͷಓʁ
98. w ίϛϡχςΟͷҙࢥܾఆͱผʹ༏͍͠ಠࡋऀͷΑ ͏ͳݸਓʹΑΔҙࢥܾఆϞσϧ
    w ੨໦ๆ࿠͞Μͷʮ3VCZͷίʔσΟϯάελΠϧʯ
    w લాमޗ͞Μͷʮ3VCZίʔσΟϯάن໿ʯ
    w ۩ମతͳʮಛఆͷ୭͔ʯॏཁͰ͸ʁ FH0OL$PQ ଥ౰ͦ͏ͳʮ୭͔ʯϧʔϧʁ
99. w ͍͍ͩͨ͏·͍͖ͦ͘͏ʁ .BU[$PQ
100. w ·ͭ΋ͱ͞Μ؂म
     
     ͷϓϦηοτ
     w 3VCZͷ਌ͱ͍͏͜ͱ͸Ѫ৘͸ੈքҰ
     
     w DisabledByDefault: trueϕʔεͷ֦ுHFN
     w ϧʔϧ
     $PQ
     ͸ແݶʹ૿͍͍͑ͯͬͯΔͷͰɺ ϛχϚϜͷελʔλʔΩοτΑ͏ͳ΋ͷʹͳΓ ͦ͏ .BU[$PQ͕બ୒Ͱ͖Δͱೲಘʁ
101. w େਓʹͳͬͨ3VCZΛݟकΔ.BU[$PQͷΑ͏ͳݖ ҖͷσϑΥϧτ͕͋Δͱ޾ͤͳ3VCZJTU͸͍ͦ͏
     w ͱ͸͍͑ϧʔϧͷऔࣺબ୒͕͍ͨ΁Μͦ͏
     w 3VCP$PQϓϩμΫτͱͯ͠͸αϙʔτελΠϧ ͷͻͱͭͱݟ၏͠3VCP$PQͷ఩ֶΛຬ଍ͤ͞Β ΕΔ 3VCP$PQ͕·ͩݟ͵ੈք 3VCP$PQ
     ΁ͷ॓୊
102. lιϑτ΢ΣΞ͸ਓ͕
     ਓͷͨΊʹ࡞͍ͬͯΔ 3VCP$PQͱ͍͏ιϑτ΢ΣΞͱਓͷରൺʹয఺Λ౰ͯΔͱผͷຯΘ͍͕͋Γ·͢Ͷ Software is made for people by people ฏು
     ݈ࣇ
     &4.
     *OD
     $&0
103. νʔϜʹڞ௨ͷίʔσΟϯάඪ४ΛٻΊΔͷ͸೉͍͠࿩ͩΖ͏ɻ ϓϩάϥϚʔ͸ඇৗʹ߆Γ͕ڧ͘ɺதׅހͷҐஔΛม͑Δ΄Ͳ
     ͳΒࣙΊͯ͠·͏͔΋͠Εͳ͍ɻͨͩ͠ɺ
     ✦ 91ͱ͍͏Ξϓϩʔν͕ɺ൴ΒΛ੒ޭ͢ΔνʔϜͷҰһʹ͢Δ ՄೳੑΛߴΊΔͳΒɻ
     ͦͷ৔߹ɺελΠϧΛগ͠ۂ͛Δ͜ͱΛԀΘͳ͍͔΋͠Εͳ͍ɻ ͞ΒʹɺίʔσΟϯάඪ४͕ͳ͚Ε͹ɺ༨ܭͳຎࡲ͕ੜ͡ɺ
     ϖΞϓϩάϥϛϯά΍ϦϑΝΫλϦϯά͕ஶ͘͠஗͘ͳΔɻ $PEJOH
     4UBOEBSET 91&TU
     3PDLT
104. ϧʔϧ͸։ൃऀΛറΔͨΊͰ ͸ͳָ͘ʹ͢ΔͨΊʹ࢖͓͏