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Bye-bye Magic Number
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hideki kinjyo
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September 18, 2018
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Bye-bye Magic Number
CakePHP3アプリケーションで、「マジックナンバー」的な値とどう向き合っていくかを考えた結果
hideki kinjyo
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September 18, 2018
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Transcript
Bye-Bye Magic Number ʙʮࣙॻʯΛ࡞ͬͨʙ Hideki Kinjyo twitter: @o0h_ / github:
o0h
ࣗݾհ • ίωώτגࣜձࣾ • αʔόʔαΠυΤϯδχΞ • ओʹCakePHPͳͲ
ࠓ͓͢Δ͜ͱ • ϚδοΫφϯόʔʹউͭͧɾɾɾʂ • ͦͷͨΊʹ”Ϟϊ”Λ࡞Γ·ͨ͠
Έͳ͞Μɺ ΞϓϦέʔγϣϯͷʮఆʯ ͷཧͲ͏͍ͯ͠·͔͢ʁ ϚδοΫφϯόʔ తͳͭ
͜͏͍͏ͭ • Ϣʔβʔͷొঢ়ଶ͕ɾɾ • 0: ϝʔϧΞυϨε֬ೝͪ • 1: ࢧ͍ใ֬ೝͪ •
2: ొྃ
ᶃϚδοΫφϯόʔਏ͍
ᶃϚδοΫφϯόʔਏ͍ • ಡΜͰ͍ͯʮಥવग़͖ͯͨʯײ͡ • ʮಛผͳҙຯͷ͋Δʯʁʮྔͱ͔߹͍Λද͍ͯ͠ Δʯʁ • ผ͕ͮ͠Β͍ • grep͠ʹ͘͞
=> ϦϑΝΫλ͠ʹ͘͞ • etc… (άάͬͨΒ৭ʑग़ͯ͘ΔͷͰׂѪ
ᶄϞσϧΫϥεͷఆʹʂ
ᶄϞσϧΫϥεͷఆʹʂ • ୯ޠͰ໊લ͕͚ΒΕ͍ͯΔ͔Β͔Γ͢ ͍Ͷʂ • ؔ࿈͢ΔࣝΛ1Օॴʹ·ͱΊΒΕ͔ͯΓ ͍͢Ͷʂ(scoped, contextual)
ᶄϞσϧΫϥεͷఆʹʂ • ʮͲͷΫϥεʹஔ͔͘ʯ·͍͠ • ͋ΕɺTableʹ࣋ͨͤΔʁEntityʹ࣋ͨͤ Δʁ • ͦͦϞσϧͱؔ࿈͠ͳ͍ࣝͲ͏͢Δʁ
ᶅConfigureΫϥεͰѻ͏ʂ
ᶅConfigureΫϥεͰѻ͏ʂ • ͜ΕͰ໊͚Մೳʂ • ֊ԽͰ͖Δʂ • ʮͲͷΫϥεʹଐ͢Δ͔ʯΛҙࣝͤͣʹ͓͚ Δʂ
ᶅConfigureΫϥεͰѻ͏ʂ • Ζ͏ͱࢥ͑ॻ͖͑ΒΕͪΌ͏ΑͶ… • ७ਮͳʮΞϓϦέʔγϣϯͷઃఆʯͱ ͍ࠞͬͯ͟ΔͷɺԿͱͳ͘ؾ࣋ͪѱ͍͔… • ෆ༻ҙʹ͘ͳΓ͕ͪɻ • ͪͳΈʹɺ
ίωώτʹ2,181ߦͷconstants.php͕͋Γ·͢
ͳΜ͔ྑ͍ͷͳ͍ͷ͔ͳʂ
ͭͬͯ͘Έͨʂ
None
ͳΜͰ͔͢ • ఆΫϥεΛϦονʹ͠·ͨ͠Έ͍ͨͳͷ • ΫϥεΛఆٛͯ͠ ʮ໊લʯͱʮʯͷએݴΛ͓ͯ͘͠ • ʮࣙॻʯ͕͍ͬͯΔใΛ ʮEnumʯͱͯ͠औΓग़ͤΔΑ͏ʹͳΔ •
PHPʹྻڍܕ͕ͳ͍͔ΒΦϨΦϨ࣮
ʮࣙॻʯͷ࡞Γํ • AbstractΫϥεΛܧঝͯ͠ • `ENUM_` prefixΛ࣋ͬͨconstΛએݴ͢Δ
ʮࣙॻʯͷ࡞Γํ
ʮࣙॻʯͷ͍ํ
ࣙॻͷԠ༻ᶃʮTypeʯ • Database\Type\EnumType • marshal/toPHPͰEnumΛѻ͑ΔΑ͏ʹ͢Δ
ࣙॻͷԠ༻ᶃʮEnumTypeʯ
ࣙॻͷԠ༻ᶃʮEnumTypeʯ
ࣙॻͷԠ༻ᶄʮValidationʯ • ʮରԠ͢Δࣙॻʹએݴ͞Ε͍ͯΔ͔ʯΛ νΣοΫ͢ΔValidationProvider • ʮ͜ͷྻ͜ͷࣙॻʯͱ͍͏ͷΛ ηοτ͓ͯ͘͠ͱɺະએݴͳΛڋ൱Ͱ͖Δ
ࣙॻͷԠ༻ᶄʮValidationʯ
ࣙॻͷԠ༻ᶄʮValidationʯ
·ͱΊ • લੈͷΞϓϦέʔγϣϯͰ ϚδοΫφϯόʔconstansͷരൃ͕ਏͯ͘ɾɾ • CakePHP3ͷPJ্ཱͪ͛࣌ʹ ݁ߏͳίετΛ͔͚ͭͭɺ͜ͷػߏͷ࡞Λߦ͍·ͨ͠ • ݁Ռɺॻ͖ํ͕౷Ұ͞Ε͍͍ͯײ͡ •
ͱΓΘ͚ɺCakePHP3ͷORMपΓ͔ͳΓڧԽ͞Ε͍ΔͷͰ Type/ValidationपΓͱͷ࿈ܞ͕ศར • ಠཱͨ͠ϨϙδτϦʹ͓͍ͨࣄͰϙʔλϏϦςΟ
͝ਗ਼ௌɺ ͋Γ͕ͱ͏͍͟͝·ͨ͠ʂ ࣮ͷͱ͔͍ͯ͠ͳ͍ͷͰ ͓ؾܰʹฉ͍͍ͯͩ͘͞