履歴テーブル、今回はこう作りました〜 Delegated Types編〜 / How We Built Our History Table This Time

履歴テーブル、今回はこう作りました〜 Delegated Types編〜 / How We Built Our History Table This Time — With Delegated Types

by moznion

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ཤྺςʔϒϧɺࠓճ͸͜͏࡞Γ·ͨ͠ ʙ%FMFHBUFE5ZQFTฤʙ 3VCZPO3BJMTͷςʔϒϧઃܭͱτϥϯβΫγϣϯॲཧ-5/JHIU 5IV /PW !NP[OJPO

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4NBSU#BOL *OD 4PGUXBSF&OHJOFFS 5BJLJ,BXBLBNJ !NP[OJPO !NP[OJPO !NP[OJPO

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ཤྺςʔϒϧ

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ཤྺςʔϒϧ ͦͷ໊ͷ௨ΓཤྺΛදݱɾอଘ͢ΔͨΊͷςʔϒϧ • Ϣʔβʔͷߦಈ • γεςϜͷߋ৽ • ͳͲͳͲ……

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ཤྺςʔϒϧ͕͋ΔͱԿ͕ྑ͍ͷ͔ w໰୊͕ൃੜͨ࣌͠ʹௐ͕ࠪͰ͖Δ ྫϢʔβʔ໰͍߹ΘͤରԠ wূ੻ͱͯ͠ѻ͑Δ ྫ؂ࠪରԠ wҰ࿈ͷཤྺΛྲྀ͠ࠐΉ͜ͱͰ ࣌ ܥྻͷॲཧ͕Ͱ͖Δ̈ wߦಈɾಈଶ෼ੳʹ࢖͑Δ wͳͲͳͲʜʜ ̈ҰछͷΠϕϯτιʔγϯά

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ཤྺςʔϒϧ͕͋ΔͱԿ͕ྑ͍ͷ͔ ཤྺΛImmutableͳσʔλͱͯ͠ѻ͏͜ͱʹΑΓ  ͜ͷΑ͏ͳϝϦοτΛಘΔ͜ͱ͕Ͱ͖Δ w໰୊͕ൃੜͨ࣌͠ʹௐ͕ࠪͰ͖Δ ྫϢʔβʔ໰͍߹ΘͤରԠ wূ੻ͱͯ͠ѻ͑Δ ྫ؂ࠪରԠ wҰ࿈ͷཤྺΛྲྀ͠ࠐΉ͜ͱͰ ࣌ ܥྻͷॲཧ͕Ͱ͖Δ̈ wߦಈɾಈଶ෼ੳʹ࢖͑Δ wͳͲͳͲʜʜ ̈ҰछͷΠϕϯτιʔγϯά

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ࠓճͷࣄྫΞϑΟϦΤΠτϓϩάϥϜ

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ΞϑΟϦΤΠτϓϩάϥϜ֓؍ ΞϑΟϦΤΠτϓϩάϥϜࢀՃ

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ΞϑΟϦΤΠτϓϩάϥϜ֓؍ ΞϑΟϦΤΠτϓϩάϥϜࢀՃ ֎෦αΠτ ίϯόʔδϣϯ

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ΞϑΟϦΤΠτϓϩάϥϜ֓؍ ΞϑΟϦΤΠτϓϩάϥϜࢀՃ ֎෦αΠτ ίϯόʔδϣϯ ৘ใಉظ "41̈ ̈"41ΞϑΟϦΤΠταʔϏεϓϩόΠμʔ

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ΞϑΟϦΤΠτϓϩάϥϜ֓؍ ΞϑΟϦΤΠτϓϩάϥϜࢀՃ ֎෦αΠτ ίϯόʔδϣϯ ৘ใಉظ "41̈ ঢ়ଶΛ௨஌  (ൃੜɾঝೝɾغ٫) ̈"41ΞϑΟϦΤΠταʔϏεϓϩόΠμʔ

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ΞϑΟϦΤΠτϓϩάϥϜ֓؍ ΞϑΟϦΤΠτϓϩάϥϜࢀՃ ֎෦αΠτ ίϯόʔδϣϯ ৘ใಉظ "41̈ ঢ়ଶΛ௨஌  (ൃੜɾঝೝɾغ٫) ̈"41ΞϑΟϦΤΠταʔϏεϓϩόΠμʔ ͜ΕΒͷΠϕϯτΛཤྺςʔϒϧͰѻ͏

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ΞϑΟϦΤΠτϓϩάϥϜ֓؍ ΞϑΟϦΤΠτϓϩάϥϜࢀՃ ֎෦αΠτ ίϯόʔδϣϯ ৘ใಉظ "41̈ ঢ়ଶΛ௨஌  (ൃੜɾঝೝɾغ٫) ̈"41ΞϑΟϦΤΠταʔϏεϓϩόΠμʔ ͜ΕΒͷΠϕϯτΛཤྺςʔϒϧͰѻ͏ ͜ͷϥΠϑαΠΫϧதͰҰҙͳID΋ඞཁ

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σʔλϞσϦϯά ʙࠓճ͸͜͏࡞Γ·ͨ͠ʙ .Z42-Ͱ͢

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ཤྺςʔϒϧσʔλϞσϦϯά DPOWFSTJPO@FWFOU CJHJOU JE 1, CJHJOU DPOWFSTJPO@JE TUSJOH FWFOUBCMF@UZQF EFMFHBUFEUZQFT CJHJOU FWFOUBCMF@JE EFMFHBUFEUZQFT CJHJOU DPOWFSTJPO@FWFOU@QSPWJEFS@MPH@JE EBUBUJNF PDDVSSFE@BU DPOWFSTJPO@FWFOU@BQQMJDBUJPOT CJHJOU JE 1, JOUFHFS SFXBSE@BNPVOU JOUFHFS QVSDIBTF@BNPVOU EBUFUJNF PDDVSSFE@BU FOSPMMNFOU@JOUFOUT CJHJOU JE 1, CJHJOU VTFS@JE VTFST΁ͷ', CJHJOU P ff FS@JE P ff FST Ҋ݅ ΁ͷ', EBUFUJNF FOSPMMFE@BU DPOWFSTJPOT CJHJOU JE 1, CJHJOU VTFS@JE VTFST΁ͷ', CJHJOU P ff FS@JE P ff FST Ҋ݅ ΁ͷ', CJHJOU FOSPMMNFOU@JOUFOU@JE FOSPMMNFOU@JOUFOUT΁ͷ', DPOWFSTJPO@FWFOU@SFKFDUJPOT CJHJOU JE 1, EBUFUJNF PDDVSSFE@BU DPOWFSTJPO@FWFOU@QSPWJEFS@MPHT CJHJOU JE 1, TUSJOH QSPWJEFS@OBNF KTPO SBX@QBZMPBE EBUFUJNF SFDFJWFE@BU DPOWFSTJPO@FWFOU@BQQSPWBMT CJHJOU JE 1, JOUFHFS SFXBSE@BNPVOU JOUFHFS QVSDIBTF@BNPVOU EBUFUJNF PDDVSSFE@BU

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ཤྺςʔϒϧσʔλϞσϦϯά DPOWFSTJPO@FWFOU CJHJOU JE 1, CJHJOU DPOWFSTJPO@JE TUSJOH FWFOUBCMF@UZQF EFMFHBUFEUZQFT CJHJOU FWFOUBCMF@JE EFMFHBUFEUZQFT CJHJOU DPOWFSTJPO@FWFOU@QSPWJEFS@MPH@JE EBUBUJNF PDDVSSFE@BU DPOWFSTJPO@FWFOU@BQQMJDBUJPOT CJHJOU JE 1, JOUFHFS SFXBSE@BNPVOU JOUFHFS QVSDIBTF@BNPVOU EBUFUJNF PDDVSSFE@BU FOSPMMNFOU@JOUFOUT CJHJOU JE 1, CJHJOU VTFS@JE VTFST΁ͷ', CJHJOU P ff FS@JE P ff FST Ҋ݅ ΁ͷ', EBUFUJNF FOSPMMFE@BU DPOWFSTJPOT CJHJOU JE 1, CJHJOU VTFS@JE VTFST΁ͷ', CJHJOU P ff FS@JE P ff FST Ҋ݅ ΁ͷ', CJHJOU FOSPMMNFOU@JOUFOU@JE FOSPMMNFOU@JOUFOUT΁ͷ', DPOWFSTJPO@FWFOU@SFKFDUJPOT CJHJOU JE 1, EBUFUJNF PDDVSSFE@BU DPOWFSTJPO@FWFOU@BQQSPWBMT CJHJOU JE 1, JOUFHFS SFXBSE@BNPVOU JOUFHFS QVSDIBTF@BNPVOU EBUFUJNF PDDVSSFE@BU ͢΂ͯͷϨίʔυ͸௥هΦϯϦʔ (immutable) DPOWFSTJPO@FWFOU@QSPWJEFS@MPHT CJHJOU JE 1, TUSJOH QSPWJEFS@OBNF KTPO SBX@QBZMPBE EBUFUJNF SFDFJWFE@BU

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ཤྺςʔϒϧσʔλϞσϦϯά DPOWFSTJPO@FWFOU CJHJOU JE 1, CJHJOU DPOWFSTJPO@JE TUSJOH FWFOUBCMF@UZQF EFMFHBUFEUZQFT CJHJOU FWFOUBCMF@JE EFMFHBUFEUZQFT CJHJOU DPOWFSTJPO@FWFOU@QSPWJEFS@MPH@JE EBUBUJNF PDDVSSFE@BU DPOWFSTJPO@FWFOU@BQQMJDBUJPOT CJHJOU JE 1, JOUFHFS SFXBSE@BNPVOU JOUFHFS QVSDIBTF@BNPVOU EBUFUJNF PDDVSSFE@BU FOSPMMNFOU@JOUFOUT CJHJOU JE 1, CJHJOU VTFS@JE VTFST΁ͷ', CJHJOU P ff FS@JE P ff FST Ҋ݅ ΁ͷ', EBUFUJNF FOSPMMFE@BU DPOWFSTJPOT CJHJOU JE 1, CJHJOU VTFS@JE VTFST΁ͷ', CJHJOU P ff FS@JE P ff FST Ҋ݅ ΁ͷ', CJHJOU FOSPMMNFOU@JOUFOU@JE FOSPMMNFOU@JOUFOUT΁ͷ', DPOWFSTJPO@FWFOU@SFKFDUJPOT CJHJOU JE 1, EBUFUJNF PDDVSSFE@BU DPOWFSTJPO@FWFOU@BQQSPWBMT CJHJOU JE 1, JOUFHFS SFXBSE@BNPVOU JOUFHFS QVSDIBTF@BNPVOU EBUFUJNF PDDVSSFE@BU ͜ͷID͕ϥΠϑαΠΫϧதͰҰҙʹͳΔ DPOWFSTJPO@FWFOU@QSPWJEFS@MPHT CJHJOU JE 1, TUSJOH QSPWJEFS@OBNF KTPO SBX@QBZMPBE EBUFUJNF SFDFJWFE@BU

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τϥϯβΫγϣϯڥք DPOWFSTJPO@FWFOU CJHJOU JE 1, CJHJOU DPOWFSTJPO@JE TUSJOH FWFOUBCMF@UZQF EFMFHBUFEUZQFT CJHJOU FWFOUBCMF@JE EFMFHBUFEUZQFT CJHJOU DPOWFSTJPO@FWFOU@QSPWJEFS@MPH@JE EBUBUJNF PDDVSSFE@BU DPOWFSTJPO@FWFOU@BQQMJDBUJPOT CJHJOU JE 1, JOUFHFS SFXBSE@BNPVOU JOUFHFS QVSDIBTF@BNPVOU EBUFUJNF PDDVSSFE@BU FOSPMMNFOU@JOUFOUT CJHJOU JE 1, CJHJOU VTFS@JE VTFST΁ͷ', CJHJOU P ff FS@JE P ff FST Ҋ݅ ΁ͷ', EBUFUJNF FOSPMMFE@BU DPOWFSTJPOT CJHJOU JE 1, CJHJOU VTFS@JE VTFST΁ͷ', CJHJOU P ff FS@JE P ff FST Ҋ݅ ΁ͷ', CJHJOU FOSPMMNFOU@JOUFOU@JE FOSPMMNFOU@JOUFOUT΁ͷ', DPOWFSTJPO@FWFOU@SFKFDUJPOT CJHJOU JE 1, EBUFUJNF PDDVSSFE@BU DPOWFSTJPO@FWFOU@BQQSPWBMT CJHJOU JE 1, JOUFHFS SFXBSE@BNPVOU JOUFHFS QVSDIBTF@BNPVOU EBUFUJNF PDDVSSFE@BU DPOWFSTJPO@FWFOU@QSPWJEFS@MPHT CJHJOU JE 1, TUSJOH QSPWJEFS@OBNF KTPO SBX@QBZMPBE EBUFUJNF SFDFJWFE@BU

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DPOWFSTJPO@FWFOU CJHJOU JE 1, CJHJOU DPOWFSTJPO@JE TUSJOH FWFOUBCMF@UZQF EFMFHBUFEUZQFT CJHJOU FWFOUBCMF@JE EFMFHBUFEUZQFT CJHJOU DPOWFSTJPO@FWFOU@QSPWJEFS@MPH@JE EBUBUJNF PDDVSSFE@BU DPOWFSTJPO@FWFOU@BQQMJDBUJPOT CJHJOU JE 1, JOUFHFS SFXBSE@BNPVOU JOUFHFS QVSDIBTF@BNPVOU EBUFUJNF PDDVSSFE@BU FOSPMMNFOU@JOUFOUT CJHJOU JE 1, CJHJOU VTFS@JE VTFST΁ͷ', CJHJOU P ff FS@JE P ff FST Ҋ݅ ΁ͷ', EBUFUJNF FOSPMMFE@BU DPOWFSTJPOT CJHJOU JE 1, CJHJOU VTFS@JE VTFST΁ͷ', CJHJOU P ff FS@JE P ff FST Ҋ݅ ΁ͷ', CJHJOU FOSPMMNFOU@JOUFOU@JE FOSPMMNFOU@JOUFOUT΁ͷ', DPOWFSTJPO@FWFOU@SFKFDUJPOT CJHJOU JE 1, EBUFUJNF PDDVSSFE@BU DPOWFSTJPO@FWFOU@BQQSPWBMT CJHJOU JE 1, JOUFHFS SFXBSE@BNPVOU JOUFHFS QVSDIBTF@BNPVOU EBUFUJNF PDDVSSFE@BU DPOWFSTJPO@FWFOU@QSPWJEFS@MPHT CJHJOU JE 1, TUSJOH QSPWJEFS@OBNF KTPO SBX@QBZMPBE EBUFUJNF SFDFJWFE@BU ϢʔβʔͷΞΫγϣϯʹΑΓൃੜ

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DPOWFSTJPO@FWFOU CJHJOU JE 1, CJHJOU DPOWFSTJPO@JE TUSJOH FWFOUBCMF@UZQF EFMFHBUFEUZQFT CJHJOU FWFOUBCMF@JE EFMFHBUFEUZQFT CJHJOU DPOWFSTJPO@FWFOU@QSPWJEFS@MPH@JE EBUBUJNF PDDVSSFE@BU DPOWFSTJPO@FWFOU@BQQMJDBUJPOT CJHJOU JE 1, JOUFHFS SFXBSE@BNPVOU JOUFHFS QVSDIBTF@BNPVOU EBUFUJNF PDDVSSFE@BU FOSPMMNFOU@JOUFOUT CJHJOU JE 1, CJHJOU VTFS@JE VTFST΁ͷ', CJHJOU P ff FS@JE P ff FST Ҋ݅ ΁ͷ', EBUFUJNF FOSPMMFE@BU DPOWFSTJPOT CJHJOU JE 1, CJHJOU VTFS@JE VTFST΁ͷ', CJHJOU P ff FS@JE P ff FST Ҋ݅ ΁ͷ', CJHJOU FOSPMMNFOU@JOUFOU@JE FOSPMMNFOU@JOUFOUT΁ͷ', DPOWFSTJPO@FWFOU@SFKFDUJPOT CJHJOU JE 1, EBUFUJNF PDDVSSFE@BU DPOWFSTJPO@FWFOU@BQQSPWBMT CJHJOU JE 1, JOUFHFS SFXBSE@BNPVOU JOUFHFS QVSDIBTF@BNPVOU EBUFUJNF PDDVSSFE@BU ࢖͍΍͢͞ύϑΥʔϚϯεͷͨΊͷඇਖ਼نԽ DPOWFSTJPO@FWFOU@QSPWJEFS@MPHT CJHJOU JE 1, TUSJOH QSPWJEFS@OBNF KTPO SBX@QBZMPBE EBUFUJNF SFDFJWFE@BU

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DPOWFSTJPO@FWFOU CJHJOU JE 1, CJHJOU DPOWFSTJPO@JE TUSJOH FWFOUBCMF@UZQF EFMFHBUFEUZQFT CJHJOU FWFOUBCMF@JE EFMFHBUFEUZQFT CJHJOU DPOWFSTJPO@FWFOU@QSPWJEFS@MPH@JE EBUBUJNF PDDVSSFE@BU DPOWFSTJPO@FWFOU@BQQMJDBUJPOT CJHJOU JE 1, JOUFHFS SFXBSE@BNPVOU JOUFHFS QVSDIBTF@BNPVOU EBUFUJNF PDDVSSFE@BU FOSPMMNFOU@JOUFOUT CJHJOU JE 1, CJHJOU VTFS@JE VTFST΁ͷ', CJHJOU P ff FS@JE P ff FST Ҋ݅ ΁ͷ', EBUFUJNF FOSPMMFE@BU DPOWFSTJPOT CJHJOU JE 1, CJHJOU VTFS@JE VTFST΁ͷ', CJHJOU P ff FS@JE P ff FST Ҋ݅ ΁ͷ', CJHJOU FOSPMMNFOU@JOUFOU@JE FOSPMMNFOU@JOUFOUT΁ͷ', DPOWFSTJPO@FWFOU@SFKFDUJPOT CJHJOU JE 1, EBUFUJNF PDDVSSFE@BU DPOWFSTJPO@FWFOU@BQQSPWBMT CJHJOU JE 1, JOUFHFS SFXBSE@BNPVOU JOUFHFS QVSDIBTF@BNPVOU EBUFUJNF PDDVSSFE@BU ࢖͍΍͢͞ύϑΥʔϚϯεͷͨΊͷඇਖ਼نԽ DPOWFSTJPO@FWFOU@QSPWJEFS@MPHT CJHJOU JE 1, TUSJOH QSPWJEFS@OBNF KTPO SBX@QBZMPBE EBUFUJNF SFDFJWFE@BU

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DPOWFSTJPO@FWFOU CJHJOU JE 1, CJHJOU DPOWFSTJPO@JE TUSJOH FWFOUBCMF@UZQF EFMFHBUFEUZQFT CJHJOU FWFOUBCMF@JE EFMFHBUFEUZQFT CJHJOU DPOWFSTJPO@FWFOU@QSPWJEFS@MPH@JE EBUBUJNF PDDVSSFE@BU DPOWFSTJPO@FWFOU@BQQMJDBUJPOT CJHJOU JE 1, JOUFHFS SFXBSE@BNPVOU JOUFHFS QVSDIBTF@BNPVOU EBUFUJNF PDDVSSFE@BU FOSPMMNFOU@JOUFOUT CJHJOU JE 1, CJHJOU VTFS@JE VTFST΁ͷ', CJHJOU P ff FS@JE P ff FST Ҋ݅ ΁ͷ', EBUFUJNF FOSPMMFE@BU DPOWFSTJPOT CJHJOU JE 1, CJHJOU VTFS@JE VTFST΁ͷ', CJHJOU P ff FS@JE P ff FST Ҋ݅ ΁ͷ', CJHJOU FOSPMMNFOU@JOUFOU@JE FOSPMMNFOU@JOUFOUT΁ͷ', DPOWFSTJPO@FWFOU@SFKFDUJPOT CJHJOU JE 1, EBUFUJNF PDDVSSFE@BU DPOWFSTJPO@FWFOU@BQQSPWBMT CJHJOU JE 1, JOUFHFS SFXBSE@BNPVOU JOUFHFS QVSDIBTF@BNPVOU EBUFUJNF PDDVSSFE@BU ࢖͍΍͢͞ύϑΥʔϚϯεͷͨΊͷඇਖ਼نԽ DPOWFSTJPO@FWFOU@QSPWJEFS@MPHT CJHJOU JE 1, TUSJOH QSPWJEFS@OBNF KTPO SBX@QBZMPBE EBUFUJNF SFDFJWFE@BU

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%FMFHBUFE5ZQFT DPOWFSTJPO@FWFOU CJHJOU JE 1, CJHJOU DPOWFSTJPO@JE TUSJOH FWFOUBCMF@UZQF EFMFHBUFEUZQFT CJHJOU FWFOUBCMF@JE EFMFHBUFEUZQFT CJHJOU DPOWFSTJPO@FWFOU@QSPWJEFS@MPH@JE EBUBUJNF PDDVSSFE@BU DPOWFSTJPO@FWFOU@BQQMJDBUJPOT CJHJOU JE 1, JOUFHFS SFXBSE@BNPVOU JOUFHFS QVSDIBTF@BNPVOU EBUFUJNF PDDVSSFE@BU FOSPMMNFOU@JOUFOUT CJHJOU JE 1, CJHJOU VTFS@JE VTFST΁ͷ', CJHJOU P ff FS@JE P ff FST Ҋ݅ ΁ͷ', EBUFUJNF FOSPMMFE@BU DPOWFSTJPOT CJHJOU JE 1, CJHJOU VTFS@JE VTFST΁ͷ', CJHJOU P ff FS@JE P ff FST Ҋ݅ ΁ͷ', CJHJOU FOSPMMNFOU@JOUFOU@JE FOSPMMNFOU@JOUFOUT΁ͷ', DPOWFSTJPO@FWFOU@SFKFDUJPOT CJHJOU JE 1, EBUFUJNF PDDVSSFE@BU DPOWFSTJPO@FWFOU@BQQSPWBMT CJHJOU JE 1, JOUFHFS SFXBSE@BNPVOU JOUFHFS QVSDIBTF@BNPVOU EBUFUJNF PDDVSSFE@BU DPOWFSTJPO@FWFOU@QSPWJEFS@MPHT CJHJOU JE 1, TUSJOH QSPWJEFS@OBNF KTPO SBX@QBZMPBE EBUFUJNF SFDFJWFE@BU

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%FMFHBUFE5ZQFTʜʜͷલʹ45* ✅ͬ͘͟Γݴ͏ͱ %#ϨϕϧͰ͸ͭͷςʔϒϧʹϨίʔυΛอଘ͠εΩʔϚΛڞ༗ͭͭ͠ ͦͷதͰෳ਺ͷNPEFMΫϥε ৼ෣͍ ΛදݱՄೳͱ͢Δύλʔϯ ୯Ұςʔϒϧܧঝʢ45*4JOHMF5BCMF*OIFSJUBODFʣ͸ɺෳ਺ͷϞσϧΛ ୯ҰͷσʔλϕʔεςʔϒϧʹऩೲͰ͖Δ3BJMTͷύλʔϯͰ͢ɻ ͜Ε͸ɺ͞·͟·ͳΤϯςΟςΟʹڞ௨ͷଐੑ΍ৼΔ෣͍Λ࣋ͨͤͭͭɺ ΤϯςΟςΟݻ༗ͷৼΔ෣͍΋͍࣋ͨͤͨ৔߹ʹศརͰ͢ɻ IUUQTSBJMTHVJEFTKQBTTPDJBUJPO@CBTJDTIUNM୯ҰςʔϒϧܧঝʢTUJʣ

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%FMFHBUFE5ZQFT %FMFHBUFEUZQFTʢҕৡܕʣ͸ɺ୯Ұςʔϒϧܧঝʢ45*ʣʹΑΔ ςʔϒϧංେԽͷ໰୊ΛɺEFMFHBUFE@UZQFͰղܾ͠·͢ɻ ͜ͷΞϓϩʔνʹΑΓɺڞ༗ଐੑΛεʔύʔΫϥεͷςʔϒϧʹอଘ͠ɺ αϒΫϥεݻ༗ͷଐੑΛผͷςʔϒϧʹอଘͰ͖ΔΑ͏ʹͳΓ·͢ɻ IUUQTSBJMTHVJEFTKQBTTPDJBUJPO@CBTJDTIUNMEFMFHBUFEUZQFT ✅ͬ͘͟Γݴ͏ͱ %#ϨϕϧͰ͸ͭͷ਌ςʔϒϧʹڞ௨ͷϨίʔυΛอଘ͠ɺ ͦΕʹؔ࿈͢Δࢠςʔϒϧʹݻ༗ͷϨίʔυΛอଘ͠ɺ ݸผͷNPEFMΫϥε ৼ෣͍ Λ࣮૷Մೳͱ͢Δύλʔϯɻ

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%FMFHBUFE5ZQFTΛ࢖͏͜ͱʹΑΔخ͠͞ • ֤छΠϕϯτΛݸผͷςʔϒϧ಺ʹอଘͰ͖Δ • ڞ௨ͷॲཧ͸਌ςʔϒϧɺݻ༗ͷΧϥϜ΍ॲཧ͸ݸผςʔϒϧͷ  ੹຿ʹͰ͖Δ̈ •ݸผςʔϒϧ΁ͷΫΤϦͰ׬݁ͤ͞Δ͜ͱ͕Ͱ͖Δ̈̈ • ಛఆͷΫϥε (ςʔϒϧ) ͔͠ඥ෇͔ͳ͍͜ͱ͕อূͰ͖ΔͷͰ  σʔλߏ଄ͱͯ͠ഁ୼ͤ͞ʹ͍͘ ̈45*ͩͱݻ༗ͷΧϥϜΛ࣋ͨͤΔ͜ͱ͸ਪ঑͞Εͳ͍ ̈̈45*ͩͱ౷ҰςʔϒϧʹΫΤϦ͢Δඞཁ͕ग़ͯ͘ΔͨΊɺڊେςʔϒϧʹͳΔͱ໰୊͕ग़ΔՄೳੑ͕͋Δ

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%FMFHBUFE5ZQFTΛ࢖͏͜ͱʹΑΔ໘౗͞ • JOIN͕૿͑ΔͷͰύϑΥʔϚϯε͕ಡΈʹ͍͘ • ಛʹෳࡶͳΫΤϦʹͳΔͱ…… • Railsݻ༗ͷػೳɾ֓೦Ͱ͋ΔͷͰ̈ SQL౳ͱͷ࿈ܞʹϋʔυϧ͕͋Δ ̈Ή͠Ζ3BJMT͕ં֯ఏڙͯ͘͠Ε͍ͯΔػೳͳͷ͔ͩΒ͋Γ͕͍ͨͱ͍͏ݟํ΋͋Δ

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ࠓճಘΒΕͳ͔ͬͨ%FMFHBUFE5ZQFTͷྑ͞ 1ͭͷςʔϒϧ͕ڊେʹͳΔ͜ͱΛ๷͛Δͱ͍͏ར఺͕͋Δ͕…… => ࠓճ͸conversion_eventςʔϒϧ͕֤delegated typesͷ  ςʔϒϧΛ౷΂͍ͯΔͷͰ௚઀తͳղܾ͕Ͱ͖ͣ

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؆୯·ͱΊ

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؆୯·ͱΊ • ΠϛϡʔλϒϧσʔλͷԸܙΛड͚ͨཤྺςʔϒϧ͸ศར • Delegated TypesͰ֤ΠϕϯτΛදݱͯ͠ཤྺΛදݱ͢Δͱ  ॊೈ͞ͱݎ࿚͞Λόϥϯεྑ͘औΓࠐΊͯྑ͍ • Έͳ͞Μ͸Ͳ͏ཤྺςʔϒϧΛ࡞͍ͬͯ·͔͢ʁ

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མึर͍ ͕࣌ؒ͋Ε͹

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3BJMTͷNPEFMʹSFMBUJPOΛுͬͯຬ଍ͯ͠͠·͏໰୊ %FMFHBUFE5ZQFTʹݶΒͣ w 3BJMTΞϓϦͰด͡ΔͿΜʹ͸ྑ͍ҰํͰ42-͕ෳࡶʹͳΓ͕ͪ̈ w %8)্ͰΫΤϦ͠Α͏ͱ͢ΔͱେมʹͳΔ܏޲̈̈ ཤྺςʔϒϧ͸ͦͷಛੑ্ɺ෼ੳΫΤϦ͕ൃߦ͞ΕΔ܏޲͕͋ΔͷͰ 42-΋૊Έқ͘ͳ͍ͬͯΔͱྑͦ͞͏̈̈̈ ̈Ӆṭ͞Ε͍ͯΔ͚ͩͱ͍͏ͷ͸ͦ͏ʜʜ ̈̈%FMFHBUFE5ZQFTͷ֤UZQFͱJEͷϖΞΛΫΤϦʹຒΊࠐΉඞཁ͕͋Δͱ͔ ̈̈̈ద੾ʹਖ਼نԽΛ่͢ͳͲ 3BJMTͷNPEFMϦον͗͢໰୊

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AFOSPMMNFOU@JOUFOU@JEAͰADPOWFSTJPOTAΛҾ͘ ADPOWFSTJPO@FWFOUTAUBCMFͱ+0*/ APDDVSSFE@BUAΛ%&4$Ͱιʔτ͠ɺ݅औಘ ߋʹऔಘͨ͠ϨίʔυͷAFWFOUBCMFAʹΞΫηε͢Δ͜ͱͰ ݸผͷΠϕϯτΛऔಘ͢Δ͜ͱ͕Ͱ͖Δ̈ ɻ ̈ΫΤϦ͕ൃʹͳͬͯ͠·͏ͱ͜Ζ͕τϨʔυΦϑ ࠷৽ͷΠϕϯτΛͲ͏Ҿ͔͘ 💡 ͜ͷ࣌ `eventable_application?` ΍ `eventable_rejection?` ͷΑ͏ͳɺ  `delegated type` ͕ੜ΍͢ϝιουΛ࢖͏ͱछผͷ൑ఆ͕Ͱ͖ͯศར

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ImmutableͳσʔλͰ͋ΔͷͰϨίʔυ਺͸جຊతʹ૿͑ଓ͚ΔҰํ  => ৔߹ʹΑΓσʔλΛ෼ׂ͢Δඞཁ͕͋Δ • ਫฏγϟʔσΟϯά • ݹ͍σʔλΛDB͔ΒDWHͳͲʹ௥͍ग़̈͢ ̈࣌ܥྻσʔλͰ͋Ε͹ݹ͍σʔλ͸͋·ΓΞΫηε͞Εͳ͍܏޲ʹ͋Δ͔΋͠Εͳ͍ɺͱ͍͏Ծઆ σʔλͷංେԽ΁ͷରԠ