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Osaka RubyKaigi 04 @willnet Shinichi Maeshima Ͳ͏ͯ͜͠͏ͳͬͨʁ ͔Βཧղ͢Δ Active Recordͷཪଆ

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Shinichi Maeshima    @netwillnet @willnet https://blog.willnet.in Willnet Inc.

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ੲ೥͚ͩେࡕʹॅΜͰ͍·ͨ͠

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HJO[BSC΍ͬͯ·͢

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ٕज़ސ໰ۀΛ͍ͯ͠·͢

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͓࢓ࣄ4/4తͳ΋ͷΛ։ൃ ͍ͯ͠·͢

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8F`SFOPUIJSJOH

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ސ໰ઌʹ͍ͭͯ͸؇ื

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େࡕ3VCZձٞʹ ొஃ͢Δͷ͸ճ໨

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աڈ࡞ͷࢿྉ͸ 4QFBLFS%FDL΍ϒϩάͰ ֬ೝͰ͖·͢

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͔͜͜Βຊ୊

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Osaka RubyKaigi 04 @willnet Ͳ͏ͯ͜͠͏ͳͬͨʁ ͔Βཧղ͢Δ Active Recordͷཪଆ

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Osaka RubyKaigi 04 @willnet Ͳ͏ͯ͜͠͏ͳͬͨʁ ͔Βཧղ͢Δ Active Recordͷཪଆ

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Active Record is like a magic w ΈΜͳେ޷͖"DUJWF3FDPSE w ن໿ʹΑΓɺ·ΔͰຐ๏ͷΑ͏ʹಈ͘ w ͜Μͳײ͡Ͱಈ͔͘ͳʁͱࢥͬͨΒ͍͍ͩͨͦͷΑ͏ʹಈ͘ w ͕ɺۃكʹͦ͏Ͱ͸ͳ͍͜ͱ΋͋Δ

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ؔ࿈Λఆٛ͢Δͱಈతʹϝιου ͕ੜ੒͞ΕΔ

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ίʔϧόοΫ΋ੜ੒͞Ε͍ͯΔ

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ʮϞσϧอଘ࣌ʹؔ࿈ઌ΋อଘ͢Δʯ Λ͢ΔίʔϧόοΫ

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͜ΕΛ࣮ߦͨ͠ͱ͖ͷڍಈΛઆ໌͠·͢

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BVUPTBWF@BTTPDJBUFE@SFDPSET @GPS@VTFSͷ࣮ࡍͷॲཧ

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͍Ζ͍Ζলུͨ͠ίʔυ

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ओʹBVUPTBWFUSVF DPNQPTJUF@QSJNBSZ@LFZTͳͲΛলུ͍ͯ͠·͢

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ؔ࿈ͷϝλ৘ใ

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CFMPOHT@UPVTFSͳͷͰVTFS͕ฦͬͯ͘Δ lVTFS@JEz͕ฦͬͯ͘Δ

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ϞσϧΦϒδΣΫτຖʹੜ੒͞ΕΔؔ࿈ΦϒδΣΫτɻ 1PTUVTFSͳͲͷؔ࿈ϝιου͸ શ෦͜ͷΦϒδΣΫτܦ༝Ͱ࣮ߦ͞ΕΔɻ ؔ࿈ઌͷΦϒδΣΫτ΋࣋ͭɻ

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ؔ࿈ઌͷΦϒδΣΫτ͕ඥ͍ͮͯͳ͔ͬͨΒ ͳʹ΋͠ͳ͍

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ؔ࿈ઌͷΦϒδΣΫτ͕ ӬଓԽ͞Ε͍ͯͳ͔ͬͨΒTBWF

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ؔ࿈ઌͷQSJNBSZ@LFZΛ ࣗ਎ͷ֎෦Ωʔͱͯ͠ઃఆ͢Δ

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ίʔϧόοΫ࣮ߦޙʹΫΤϦ͕ൃߦ ͞ΕΔ Post#save before_save User#save INSERT INTO users … post.user_id = user.id INSERT INTO posts …

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IBT@NBOZ΋େ·͔ͳ࢓૊Έ͸ ಉ͡

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λΠϛϯά͸ҧ͏

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5*14ίʔϧόοΫͷൃՐॱ൪͸ BGUFS@ DSFBUFcVQEBUF BGUFS@TBWFͷॱ

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͜ΕΛ࣮ߦͨ͠ͱ͖ͷڍಈΛઆ໌͠·͢

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BVUPTBWF@BTTPDJBUFE@SFDPSET @GPS@QPTUTͷ࣮ࡍͷॲཧ

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͍Ζ͍Ζলུͨ͠ίʔυ

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ϩʔυࡁΈͷؔ࿈ઌͷ͏ͪɺ৚݅ʹϚον͢Δ΋ͷΛऔಘ͢Δ

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࡟আࡁΈͷΦϒδΣΫτ͸ແࢹ͢Δ

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IBT@NBOZͷ਌͕TBWF࣮ߦલʹະӬଓԽɺ ΋͘͠͸ࢠ͕ະӬଓԽͳΒ

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਌ͷQSJNBSZ@LFZΛࢠͷGPSFJHO@LFZʹׂΓ౰ͯΔ

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ࢠΛTBWF͢Δ

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User#save INSERT INTO users … after_save INSERT INTO posts … post.user_id = user.id

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ؔ࿈ઌͷอଘ͸࿈࠯తʹ࣮ߦ͞ΕΔ

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User#save INSERT INTO users … INSERT INTO posts … Post#save Comment#save before_save before_save INSERT INTO comments …

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͜͜·Ͱͷ·ͱΊ w ؔ࿈Λఆٛ͢ΔͱɺTBWFͨ͠ͱ͖ʹؔ࿈ઌ΋ҰॹʹTBWF͢ΔͨΊͷίʔϧό οΫ͕ఆٛ͞ΕΔ w ίʔϧόοΫͷλΠϛϯά͸ؔ࿈ʹΑͬͯҟͳΔ w ؔ࿈ઌ͕৽نϨίʔυͰ͋Ε͹Ұॹʹอଘ͞ΕΔ ஫ଞʹ΋৚݅͸͋Δ w ؔ࿈ઌͷอଘ͸࿈࠯తʹ࣮ߦ͞ΕΔ

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IUUQTHVJEFTSVCZPOSBJMTPSHBTTPDJBUJPO@CBTJDTIUNMCJEJSFDUJPOBMBTTPDJBUJPOT

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/

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͜ͷ࣌఺Ͱऔಘͨ͠#PPLΦϒ δΣΫτͨͪʹରͯ͠ɺ൓ରଆͷ ؔ࿈ CPPLBVUIPS ΁Ϩγʔό Ͱ͋ΔBVUIPSΛׂΓ౰͍ͯͯΔ

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ͳͷͰ͜͜Ͱ͸ΫΤϦ͸ ൃߦ͞Εͳ͍

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ઌఔͷྫͱಉ༷ʹ൓ରଆͷؔ࿈ʹର͠ ͯϨγʔόΛׂΓ౰͍͕ͯͨɺͲͷؔ ࿈ʹׂΓ౰ͯͨΒ͍͍͔Θ͔Βͳ͍

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݁Ռͱͯ͜͜͠ͰΫΤϦ͕ൃߦ͞Εͯ /ʹͳΔ

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໌ࣔతʹ൓ରଆͷؔ࿈໊Λࢦఆ͢Δͱ /͕ղফ͞ΕΔ

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3BJMT͔Β૒ํ޲ؔ࿈ͷൣғ͕ ֦େͨ͠

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DPO fi HBDUJWF@SFDPSEIBT@NBOZ@JOWFSTJOHUSVF ͕ͳ͍ͱ͜͜Ͱ໌ࣔతʹJOWFSTF@PGΛॻ͍ͯ΋ແޮ

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͜͜·Ͱͷ·ͱΊ w ૒ํ޲ͷؔ࿈͕ઃఆ͞Ε͍ͯΔͱ͖ʹɺ"DUJWF3FDPSE͸൓ରଆͷؔ࿈ʹର ͯ͠ΦϒδΣΫτΛઃఆͯ͘͠ΕΔ w ࣗಈͰઃఆ͢Δؔ࿈Λਪଌ͢Δ͜ͱ͕Ͱ͖Δ͕ɺͰ͖ͳ͍ͱ͖ ྫ GPSFJHO@LFZΛઃఆ͍ͯ͠Δ ͸໌ࣔతʹJOWFSTF@PGΦϓγϣϯͰ൓ରଆͷؔ ࿈Λઃఆ͢Δඞཁ͕͋Δ w 3BJMTҎ߱͸ɺIBT@NBOZͷؔ࿈ʹର͢Δ૒ํ޲ͷؔ࿈͕ޮ͘Α͏ʹͳͬͨ

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͜͜·Ͱͷલఏ஌ࣝͰ͜ͷڍಈ͸ આ໌Ͱ͖Δ

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Post#save before_save User#save INSERT INTO users … post.user_id = user.id INSERT INTO posts … after_create Post#save before_update

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Post#save before_save User#save INSERT INTO users … post.user_id = user.id INSERT INTO posts … after_create Post#save before_update CFMPOHT@UPVTFS JOWFSTF@PGQPTUT ʹΑΓɺVTFSQPTUTʹΦϒδΣΫτׂ͕ Γ౰ͯΒΕ͍ͯΔͷͰ͜͜Ͱؔ࿈ઌͷอଘ ͕࣮ߦ͞ΕΔ

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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

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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

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Post#save before_save User#save INSERT INTO users … post.user_id = user.id INSERT INTO posts … Post#save before_update 5*14͔͜͜Β·ͨ6TFSTBWF͸ ࣮ߦ͞Εͳ͍Α͏ʹͳ͍ͬͯ·͢ after_create

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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

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΋͏ҰͭͷʮͲ͏ͯ͜͠͏ͳͬͨʁʯ

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͜ͷྫʹ͍ͭͯ͸IUUQTCMPHXJMMOFUJO FOUSZΛಡΜͰͶ

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͜͜·Ͱͷ·ͱΊ w ؔ࿈ઌΛࣗಈͰอଘ͢Δ࢓૊ΈͱɺJOWFSTF@PGʹΑΔ૒ํ޲ͷؔ࿈෇͚ʹΑ ͬͯҙਤ͍ͯ͠ͳ͍λΠϛϯάͰอଘ͕࣮ߦ͞ΕΔ͜ͱ͕͋Δ

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3BJMT͔Β௥Ճ͞Εͨઃఆ

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͜ͷ෦෼Λ࡟আͯ͠΋ࣗಈਪଌͯ͠ ͘ΕΔΑ͏ʹͳΔ

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ࠓճͷ݅ͷΑ͏ͳ*TTVF͕ෳ਺ग़ͯ ͖ͨͷͰσϑΥϧτͰ͸ແޮʹ

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͜ΕΒͷઃఆ͕ͳ͚Ε͹ʮͲ͏ͯ͠ ͜͏ͳͬͨʁʯʹ͸ͳΓʹ͍͘

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͜ΕΒͷઃఆͷϝϦοτͳΜͰ͔͢

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QPTU͕ඥ͍͍ͮͯͳ͍ͷͰQPTU͸TBWF͞Εͳ͍

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QPTU΋TBWF͞ΕΔʂ BVUPNBUJDBMMZ@JOWFSU@QMVSBM@BTTPDJBUJPOUSVF Ͱ΋Α͍

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VTFSCPPLTDSFBUFͩͱظ଴௨Γಈ͘

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CPPLXSJUJOHTʹΦϒδΣΫτ͕ࣗಈ Ͱઃఆ͞Εͳ͍

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໌ࣔతͳJOWFSTF@PG΋͘͠͸ BVUPNBUJDBMMZ@JOWFSU@QMVSBM@BTTPDJBUJPOUSVF Ͱظ଴௨Γಈ͘

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͜͜·Ͱͷ·ͱΊ w ૒ํ޲ͷؔ࿈෇͚ͷର৅Λ޿͛Δͱɺҙਤ͠ͳ͍ڍಈʹ΋ͭͳ͕Δ͕ٯʹ ʮ͜͏ಈ͍ͯ΄͍͠ʯͱ͍͏ڍಈ΋࣮ݱͰ͖Δ

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૝ఆ2" w 2σϝϦοτ΋͋Δ͚ͲϝϦοτ΋͋Δ͜ͱ͕Θ͔ͬͨͷͰɺ૒ํ޲ͷؔ࿈ Λ΋ͬͱ༗ޮʹͯ͠Έ͍ͨͷͰ͕͢ɺ͏·͍͔͘ͳ͔ͬͨͱ͖ͷσόοά͕೉ ͦ͠͏Ͱ͢ w "σόοά༻ͷπʔϧΛ࡞ͬͨͷͰྑ͚Ε͹࢖͍ͬͯͩ͘͞

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ඪ४ग़ྗʹؔ࿈ͷอଘʹؔ͢Δॲཧ ͕ग़ྗ͞ΕΔ

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"DUJWF3FDPSEͷϩάͱ߹Θͤͯ ͝׆༻͍ͩ͘͞

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શମͷ·ͱΊ w Ͳ͏ͯ͜͠͏ͳͬͨʁͱ͍͏ྫ͔Β"DUJWF3FDPSEͷʮؔ࿈ઌΛࣗಈͰอଘͯ͘͠ΕΔػ ೳʯͱʮ൓ରଆͷؔ࿈ΛࣗಈͰઃఆͯ͘͠ΕΔػೳʯʹ͍ͭͯઆ໌͠·ͨ͠ w ͲͪΒ΋ศརͳͷͰ͕͢ɺݱঢ়Ͱ͸ཱ྆͸೉ͦ͠͏ w ͍͍ΞΠσΞ͋ͬͨΒ΄͍͠ w ཧ۶͑͞Θ͔͍ͬͯΕ͹ͳʹ͔͋ͬͨͱ͖Ͱ΋ରॲͰ͖ΔͷͰɺΈͳ͞Μ͸΋͏େৎ෉Ͱ͢ Ͷ👍 w Α͘Θ͔Βͳ͍ͻͱ͸͓ۙ͘ͷٕज़ސ໰·Ͱ͝૬ஊ͍ͩ͘͞ w ͜ͷ͋ͱ4NBSU)3͞ΜͷϒʔεͰ"."ͯ͠·͢