ドメイン駆動設計勉強会〜エンティティ編〜 / 2024-02-20

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υϝΠϯۦಈઃܭ ษڧձ Takuma Yamamoto ʙ ΤϯςΟςΟฤ ʙ

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BIOGRAPHY ͋ͳͨ͸୭Ͱ͔͢ʁ 5BLVNB:BNBNPUP 8PSLBUTOBQNF 'SPN.JZB[BLJ 4/4 झຯ ɾɹɹIUUQTHJUIVCDPNUBNBHPLFSBO ɾɹɹIUUQTUXJUUFSDPNZBNBUBLV ɾɹɹIUUQTRJJUBDPNUBNBHPLFSBO ɾɹɹIUUQT[FOOEFWUBNBHPLFSBO ɾ͓΍ͭ ɾα΢φ ɾΞχϝ ɾɹɹIUUQTOPUFDPNUBNBHPLFSBO ࠷ۙ΍͍ͬͯΔ͜ͱ ɾΤϯδχΞ࠾༻શൠ ɾ-BNCEBΛ࢖ͬͨ$3.ͷ࣮૷

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INTRODUCTION Ҿ͖ଓ͖͜ͷຊΛࢀߟʹ͍ͯ͠·͢ ౓͸࠳ંͨ͠%%%Λࠓ౓͔ͦͬ͜͠ΓֶͿͨΊɺ։ൃऀʹͱͬͯ༏͍͠ೖ໳ॻͰ͋ΔʮυϝΠϯۦಈ ઃܭೖ໳ʯΛҾ͖ଓ͖ࢀߟʹ͍ͯ͠·͢ɻ

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INTRODUCTION υϝΠϯϞσϧ͔Β࣮૷ʹམͱ͠ࠐΉ෦෼ʹϑΥʔΧε վΊͯͷઆ໌ʹͳΓ·͕͢ɺ͜ͷษڧձͰ͸։ൃऀʹͱͬͯ΋ཧղ͠΍͍͢lϞσϦϯάͨ֓͠೦Λ࣮ ૷ʹམͱ͠ࠐΉͨΊͷύλʔϯzʹϑΥʔΧε͍ͯ͠·͢ɻ αϯϓϧίʔυͳͲ΋Ұॹʹڞ༗͠ͳ͕ΒਐΊΔͷͰɺͥͻΠϝʔδΛ๲Β·ͤͯɺۀ຿ʹ׆͔ͤͦ͏ ͳ෦෼Λ୳͍͚ͯͨͩ͠Ε͹ͱࢥ͍·͢ʂ υϝΠϯͷ֓೦ υϝΠϯϞσϧ υϝΠϯ ΦϒδΣΫτ ͜͜ʹूத

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Previous Review લճͷৼΓฦΓ

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REVIEW “஋” ͕࣋ͭੑ࣭ ஋ΦϒδΣΫτ͸ͦͷ໊ͷ௨Γɺz஋zͱͯ͠ͷੑ࣭Λ࣋ͭΦϒδΣΫτͰͨ͠ɻͦͯ͠ɺz஋z͕࣋ͬ ͍ͯΔੑ࣭ͱͯ͠ɺҎԼͷΑ͏ͳ΋ͷ͕ڍ͛ΒΕ͍ͯ·ͨ͠ɻ ɾෆมͰ͋Δ ɾަ׵͕ՄೳͰ͋Δ ɾ౳ՁੑʹΑͬͯൺֱ͞ΕΔ

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REVIEW ஋ΦϒδΣΫτΛ࢖༻͢ΔϝϦοτ ϓϦϛςΟϒͳ஋͚ͩͰγεςϜΛߏங͢ΔͷͰ͸ͳ͘ɺద੾ͳՕॴͰ஋ΦϒδΣΫτΛར༻࣮ͯ͠ ૷͢Δ͜ͱͷϝϦοτʹ͍ͭͯɺҎԼͷΑ͏ͳઆ໌Λ͞Ε͍ͯ·ͨ͠ɻ ɾදݱྗΛ૿͢ ɾෆਖ਼ͳ஋Λଘࡏͤ͞ͳ͍ ɾޡͬͨ୅ೖΛ๷͙ ɾϩδοΫͷࢄࡏΛ๷͙

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INTRODUCTION ࠓ೔ͷ୊ࡐ͸ “ΤϯςΟςΟ” Ͱ͢ ࠓ೔͸஋ΦϒδΣΫτͱ͸ਅٯͷΑ͏ͳੑ࣭Λ࣋ͭlΤϯςΟςΟzͱ͍͏υϝΠϯΦϒδΣΫτʹͭ ͍ͯ࿩͠·͢ɻ ஋ΦϒδΣΫτ ΤϯςΟςΟ ˞&3ਤ΍ΦϒδΣΫτؔ܎ϚοϐϯάͰग़ͯ͘ΔΤϯςΟςΟͱ͸ҟͳΔ֓೦ͳͷͰ஫ҙ⚠

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What are the properties of “Entity”? ͦ΋ͦ΋ “ΤϯςΟςΟ” ͕࣋ͭੑ࣭ͱ͸Կ͔

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LESSON “஋” ͱ͸ਅٯͷΑ͏ͳੑ࣭Λ࣋ͭ લճ঺հͨ͠஋ΦϒδΣΫτͱ͸ҧ͍ɺΤϯςΟςΟ͸ҎԼͷΑ͏ͳੑ࣭Λ࣋ͭͱ͞Ε͍ͯ·͢ɻ ͔͜͜Β͸্هͷੑ࣭ʹ͍ͭͯɺͻͱͭͣͭ۷ΓԼ͛ɺΤϯςΟςΟʹֶ͍ͭͯΜͰ͍͖·͢ɻ ɾՄมͰ͋Δ ɾಉ͡ଐੑͰ͋ͬͯ΋۠ผ͞ΕΔ ɾಉҰੑΛ΋ͭ

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How are the properties represented in Entity? ͦͷੑ࣭ΛΤϯςΟςΟͰͲ͏දݱ͢Δ͔

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LESSON ΤϯςΟςΟͷੑ࣭ “ՄมͰ͋Δ” ࢲͨͪਓؒͷl਎௕z΍lମॏzͱ͍ͬͨଐੑ͕มԽ͢Δͷͱಉ͡Α͏ʹɺΤϯςΟςΟͷଐੑ͸มԽ ͢Δ͜ͱ͕ڐ༰͞Ε͍ͯ·͢ɻ ˞ՄมͳΦϒδΣΫτ͸جຊతʹ໽հͳଘࡏͰ͋ΔͨΊɺෆมͷ··ͰΑ͍΋ͷ͸ෆมʹ͢΂͖⚠ ਎௕ͷมԽ ମॏͷมԽ

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LESSON ΤϯςΟςΟͱͯ͠ਖ਼͍࣮͠૷͸ʁ Ϣʔβʔ໊Λมߋ͍ͨ͠৔߹ɺzΤϯςΟςΟzͱͯ͠ਖ਼͍࣮͠૷͸ͲͪΒͰ͠ΐ͏͔ʁ B A

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LESSON ΤϯςΟςΟͱͯ͠ਖ਼͍࣮͠૷͸ʁ ΦϒδΣΫτ͕࣋ͭଐੑΛϝιουΛ௨ͯ͡มߋ͢Δ"͕ɺΤϯςΟςΟͱͯ͠ਖ਼͍࣮͠૷Ͱ͢ɻ B A ΤϯςΟςΟͰͷ࣮૷ྫ ஋ΦϒδΣΫτͰͷ࣮૷ྫ

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LESSON ΤϯςΟςΟͷੑ࣭ “ಉ͡ଐੑͰ͋ͬͯ΋۠ผ͞ΕΔ” ஋ΦϒδΣΫτ͸ଐੑ͕ಉ͡Ͱ͋Ε͹ಉ͡΋ͷͱͯ͠ѻΘΕ·͕ͨ͠ɺΤϯςΟςΟ͸ଐੑ͕ಉ͡Ͱ ͋ͬͯ΋۠ผ͞Ε·͢ɻਓؒͰ͍͏ಉ੏ಉ໊ΛΠϝʔδͯ͠΋Β͑Δͱཧղ͠΍͍͢ͱࢥ͍·͢ɻ ໺ٿք ΞΠυϧք lUBLV̋̋LJNV̋̋z lUBLV̋̋LJNV̋̋z

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LESSON ΤϯςΟςΟͷੑ࣭ ”ಉҰੑΛ΋ͭ” Ͱ͸γεςϜ্ಉ͡ଐੑͰ͋ΔΦϒδΣΫτΛͲͷΑ͏ʹͯ۠͠ผ͢Δͷ͔ʁͦ͜Ͱ࢖༻͞ΕΔͷ͕ ࣝผࢠͰ͢ɻ ࣝผࢠΛར༻͢Δ͜ͱͰɺϢʔβʔ໊Λมߋͨ͠ͱͯ͠΋ɺมߋલޙͷϢʔβʔ͕ಉҰͰ͋Δͱ͍͏ ͜ͱΛࣝผ͢Δ͜ͱ͕Ͱ͖·͢ɻ lUBLVNBZBNBNPUPz lUBNBHPLFSBOz

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LESSON ΤϯςΟςΟͱͯ͠ਖ਼͍࣮͠૷͸ʁ ౳ՁੑͰ͸ͳ͘ɺಉҰੑͰ۠ผ͞ΕΔΤϯςΟςΟͱͯ͠ਖ਼͍࣮͠૷͸ͲΕͰ͠ΐ͏ʁ B A

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LESSON ΤϯςΟςΟͱͯ͠ਖ਼͍࣮͠૷͸ʁ ࢯ໊ଐੑͰ͸ͳ͘ɺࣝผࢠͰൺֱΛ͍ͯ͠Δ#͕ɺΤϯςΟςΟͱͯ͠ਖ਼͍࣮͠૷Ͱ͢ɻ B A

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The bene fi ts of using Domain Objects υϝΠϯΦϒδΣΫτΛ࢖༻͢ΔϝϦοτͱ͸

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LESSON υϝΠϯΦϒδΣΫτΛ࢖༻͢ΔϝϦοτʹ͍ͭͯ ͓ޓ͍ʹҟͳΔੑ࣭Λ࣋ͭl஋ΦϒδΣΫτzͱlΤϯςΟςΟz͸ɺ͍ͣΕ΋υϝΠϯΦϒδΣΫτ ͰɺҎԼͷΑ͏ͳϝϦοτΛ࣋ͪ·͢ɻ ͔͜͜Β͸্هͷϝϦοτʹ͍ͭͯ঺հ͠·͢ɻద੾ͳ৔໘ʹग़͘Θͨ͠ͱ͖ɺl஋ΦϒδΣΫτz ΍lΤϯςΟςΟzͰ࣮૷͍ͨ͠ͱࢥͬͯ΋Β͑Δͱخ͍͠Ͱ͢ɻ ɾίʔυͷυΩϡϝϯτੑ͕ߴ·Δ ɾυϝΠϯʹ͓͚ΔมߋΛίʔυʹ఻͑΍͘͢͢Δ

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LESSON ϝϦοτ “ίʔυͷυΩϡϝϯτੑ͕ߴ·Δ” લճ΋঺հ͠·͕ͨ͠ɺࡏݿ؅ཧʹ͓͍ͯ঎඼ίʔυΛҎԼͷΑ͏ʹϓϦϛςΟϒͳ஋Ͱ؅ཧ͍ͯ͠ Δͱɺ঎඼ίʔυ͕ͲͷΑ͏ͳϩδοΫͰઃܭ͞Ε͍ͯΔ͔ಡΈऔΕ·ͤΜɻ ҰํͰҎԼͷΑ͏ʹ࣮૷͢Δͱɺ࣮͸ʮΧςΰϦɾ࿈൪ɾϨϏδϣϯʯͱ͍͏ߏ੒Ͱ঎඼ίʔυ͕ઃ ܭ͞Ε͍ͯΔ͜ͱ͕໌֬ʹͳΓɺυΩϡϝϯτੑ͕ߴ·Γ·͢ɻ

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LESSON ϝϦοτ “υϝΠϯʹ͓͚ΔมߋΛίʔυʹ఻͑΍͘͢͢Δ” ঎඼ίʔυʹ͸lΧςΰϦʔͷ෦෼͕จࣈͰߏ੒͞ΕΔzͱ͍͏ϧʔϧ͕͋Δͱ͠·͢ɻͦͷϧʔϧ ΛνΣοΫ͢ΔॲཧΛυϝΠϯΦϒδΣΫτΛ࢖༻ͤͣɺҎԼͷΑ͏ʹ࣮૷͍ͯͨ͠ͱ͠·͢ɻ γεςϜΛ։ൃ্͍ͯ͘͠Ͱɺ঎඼ίʔυ͕ೖྗ͞ΕΔՕॴ͕૿͑ΔͱɺͦΕʹ൐্͍هͷॲཧ΋૿ ͑·͢ɻͦͷঢ়گͰΧςΰϦʔͷจࣈ਺ΛzจࣈzͰߏ੒͢ΔΑ͏มߋͨ͠ΒͲ͏ͳΔͰ͠ΐ͏ʁ ϧʔϧมߋΛదԠ͢ΔՕॴΛ୳͠ग़͢ͷ͕ͱͯ΋େมͳͷ͸໌നͩͱࢥ͍·͢ɻ

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LESSON ͦͷॲཧΛl஋ΦϒδΣΫτzͱͯ͠Ϋϥεͷதʹด͡ࠐΊɺඞͣl஋ΦϒδΣΫτzΛ௨ͯ͠ॲཧ͠ ͯ͠·͑͹ɺϧʔϧมߋ͕͋ͬͨͱ͖ʹ͙͢ʹίʔυʹద༻͢Δ͜ͱ͕Ͱ͖·͢ɻ ϝϦοτ “υϝΠϯʹ͓͚ΔมߋΛίʔυʹ఻͑΍͘͢͢Δ”

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How do we set the criteria? ΤϯςΟςΟͱ࣮ͯ͠૷͢΂͖ج४͸ʁ

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LESSON ஋ΦϒδΣΫτͱΤϯςΟςΟͰ໎ͬͨΒ l஋ΦϒδΣΫτzͱlΤϯςΟςΟzʹ͸ࣅ௨ͬͨ෦෼͕͋ΔͨΊɺͲͪΒͰ࣮૷͢Δ΂͖͔ج४͕ ͋Δͱخ͍͠Ͱ͢ΑͶɻ͜ͷຊͰ͸ҎԼͷج४͕঺հ͞Ε͍ͯ·͢ɻ ϥΠϑαΠΫϧ΍࿈ଓੑΛ͔࣋ͭ ྫ Ϣʔβʔ͸ΞΧ΢ϯτొ࿥Ͱ࡞੒͞Εɺར༻͍ͯ͘͠͏ͪʹঃʑʹΞΫηε͕ݮ͍ͬͯ ͖ɺϢʔβʔ͕࡟আ͞ΕΔɻ·͞ʹϥΠϑϥΠΫϧΛ࣋ͪɺ࿈ଓੑͷ͋Δ֓೦ɻ

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LESSON γεςϜͷίϯςΩετ࣍ୈͰมΘΔ ಉ͡ର৅෺Ͱ͋ͬͨͱͯ͠΋ɺϥΠϑαΠΫϧΛ࣋ͨͤΔ΂͖͔Ͳ͏͔͸ɺγεςϜͷίϯςΩετ ʹΑͬͯҟͳΓ·͢ɻ εφοΫϛʔ ϨγϐαʔϏε ࡐྉ ϨγϐΛߏ੒͢ΔϥΠϑαΠΫϧ࣋ͨͳ͍ύʔπ ੡଄͞Εɺ޻৔ʹಧ͖ɺظݶ·Ͱʹ࢖༻͢Δ ஋ΦϒδΣΫτͰͷ࣮૷͕ద੾ ΤϯςΟςΟͰͷ࣮૷͕ద੾ ͱ͍ͬͨϥΠϑϥΠΫϧΛ࣋ͭ

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Where could we potentially use Entity? εφοΫϛʔͩͱɺͲ͜ΛΤϯςΟςΟͰ࣮૷Ͱ͖ͦ͏͔ʁ

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GitHub Ͱ୳ͯ͠Έ·͠ΐ͏ʂ

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Summary ΤϯςΟςΟʹ͍ͭͯ·ͱΊΔͱ…

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SUMMARY ΤϯςΟςΟʹֶ͍ͭͯΜͰΈͯ… ɾΤϯςΟςΟ͸ɺҎԼʹࣔ͢Α͏ͳz஋zͷੑ࣭Λ࣋ͭ ɹɾՄมͰ͋Δɺಉ͡ଐੑͰ͋ͬͯ΋۠ผ͞ΕΔɺಉҰੑΛ΋ͭ ɾυϝΠϯΦϒδΣΫτΛ࢖ͬͨγεςϜ։ൃ͸ɺҎԼʹࣔ͢Α͏ͳϝϦοτΛ࣋ͭ ɹɾίʔυͷυΩϡϝϯτੑ͕ߴ·ΔɺυϝΠϯʹ͓͚ΔมߋΛίʔυʹ఻͑΍͘͢͢Δ ɾ஋ΦϒδΣΫτͰ͸ͳ͘ɺΤϯςΟςΟͰ࣮૷͢Δج४ ɹɾϥΠϑαΠΫϧ΍࿈ଓੑΛ͔࣋ͭͲ͏͔

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Recruitment ΤϯδχΞืूதͰ͢ʂ

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RECRUITMENT We are Hiring! εφοΫϛʔͰ͸ɺʮ͓΍ͭͱɺੈքΛ໘ന ͘ʯ͍ͯ͘͠ɺͦΜͳ׆ಈΛ࢓ࣄͱͯ͠औΓ૊ Έ͍ͨΤϯδχΞΛืू͍ͯ͠·͢ɻ IUUQTUFBNTOBRNFDPN εφοΫϛʔ࠾༻