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Fujimura Daisuke
March 23, 2019
Programming
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入門 名前
Fujimura Daisuke
March 23, 2019
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Transcript
ೖ ໊લ Rails Developer Meetup 2019 ౻ଜେհ
ࣗݾհ • ౻ଜେհ • גࣜձࣾϚνϚν • Rails ྺ 10
• https://twitter.com/ffu_ • https://github.com/fujimura
͜ͷൃදʹ͍ͭͯ • ౻ଜ໊લʹͩ͜ΘΓ͕͋Δ • ໊લʹ͍ͭͯͷৄ͍͠આ໌͕ͳ͍ͱৗʑࢥ͍ͬͯͨ • Rails͚ͩͲɺ໊લେࣄͩ͠ɺͦΖͦΖߟ͑Λ·ͱΊ͍ͨͳͱࢥͬͨ • ͪͳΈʹ WEB+DB
Press Ͱ໊લʹ͍ͭͯͷهࣄΛॻ͍͍ͯΔ
໊લͱ • ϓϩάϥϚʔ໊લΛຖ͍ͬͯΔ • ॏཁͳ͜ͱΘ͔͍ͬͯΔ • ͚Ͳɺ໊ͦͦલͬͯԿʁඞཁͳͷʁͳΜͰॏཁͳͷʁྑ໊͍લͷج४ ʁ • ࣮Α͘Θ͔Βͳ͍
͓͠ͳ͕͖ • ໊લศར • ໊લͷΈ • ͳ໊ͥલॏཁͳͷ͔ • ྑ໊͍લͱ •
࣮ ѱ໊͍લ
໊લศར • ·໊ͣલ͕͍͔ʹศརͳπʔϧͰ͋Δ͔Λ֬ೝ͠·͢
໊લΛΘͣʹϓϩάϥϜΛॻ͍ͯΈΑ͏ • ໊લͳ͠ͰϓϩάϥϜॻ͚Δ • Lazy K ͱ͍͏ϓϩάϥϛϯάݴޠͰૉΛੜ͢ΔίʔυʢͷҰ෦ʣ • ͭΒ͍ʂ (SII(S(K(S(S(K(SII(S(S(KS)(S(K(S(KS)))(S(K(S(S(KS)(SS(S(S(KS)K))(KK)))))
(S(S(KS)(S(KK)(S(KS)(S(S(KS)(S(KK)(S(KS)(S(S(KS)(S(KK)(SII))) (K(SI(KK)))))))(K(S(K(S(S(KS)(S(K(SI))(S(KK)(S(K(S(S(KS)K)(S(S(KS)K)I) ...
໊લΛͬͯϓϩάϥϜΛॻ͍ͯΈΑ͏ • Ruby ͱ͍͏ϓϩάϥϛϯάݴޠͰૉΛੜ͢Δίʔυ • ಡΊΔʂ • ཧղͰ͖Δʂ require 'prime'
Prime.each
ͦͦɺͳΜͷͨΊʹ໊લΛ͚ͭΔͷ • ୯ʹศར͔ͩΒɺΑΓਂ͍త͕͋Δ • ໊લͷҙຯΛ͔ͭͬͯɺࡉ෦Λཧղͤͣ࠶ར༻͢ΔͨΊ • ࠷ऴతʹɺੜ࢈ੑͷͨΊ
࠶ར༻ʹΑΔੜ࢈ੑͷ্ʮٕज़ʯͷࠜװ • զʑͳͥ Ruby on Rails ͕ಈ͘ͷ͔Βͳ͍͚Ͳ͑Δ • RailsɺMRIɺσʔλϕʔεɺͦͷଞϛυϧΣΞɺCPU… •
ࡉ෦Λཧղͤͣʹ࠶ར༻Ͱ͖Δ͜ͱ͕ٕज़ͷఆٛͷͻͱͭ • ͜ΕͰਓྨͷੜ࢈ੑ্͕͖ͬͯͨ • ৠؾػؔɺిؾɺίϯϐϡʔλʔ • ϓϩάϥϜͦͷҰͭ
໊લศར ·ͱΊ • ໊લ͕͋Δͱɺ࣮Λಡ·ͳͯ͘ϓϩάϥϜΛ࠶ར༻Ͱ͖Δ • ࠶ར༻Ͱ͖Δͱɺੜ࢈ੑ্͕͕Δ • ศརͲ͜ΖͰͳׂ͍ΛՌ͍ͨͯ͠Δ
໊લͷ͘͠Έ • ໊લ͕͍͔ʹϓϩάϥϛϯάͱ͍͏ٕज़ʹͱͬͯॏཁͳπʔϧͰ͋Δ͔ Θ͔Γ·ͨ͠ • ࠓ໊લͷΈΛ֬ೝ͠·͢
໊લͬͯͳʹ • Կ͔ʹ͍ͭͨϥϕϧͷ͜ͱ ΓΜ͝
໊લͷҙຯͬͯͳʹ • ϥϕϧ͕ରΛʮࢦࣔʯ͍ͯ͠Δ͜ͱ • ʮΓΜ͝ʯͬͯݴ༿ͷҙຯʁΓΜ͝ͷ͜ͱͰ͠ΐɺͱ͍͏ͷΛ͘͠ݴͬ ͨܗ ΓΜ͝
ϓϩάϥϜʹ͓͚Δ໊લͬͯͳʹ • ॲཧʹ͍ͭͨϥϕϧͷ͜ͱ • ϝιουͷྫ find_or_initialze_by model = Model.find(params[:id]) unless
model Model.new(params end
ϓϩάϥϜʹ͓͚Δ໊લͷҙຯͬͯͳʹ • ͦͷݴ༿͕ࢦࣔ͢͠ରʁ • ڍಈʁ • ͳΜ͔ײతʹҧ͍ͦ͏ • ֬ೝ͠·͢
ରΛࢦࣔ͢Δ͜ͱͩͬͨΒ • ʮ౻ଜେհʯͷҙຯɺ͜͜Ͱ͍ͬͯΔਓؒɺͱͳΔ • ʮΓΜ͝ʯͷҙຯɺੈքʹଘࡏ͢ΔΓΜ͝ͷશͯɺͱͳΔ • ※ ͜͜ΒΜͰࢦࣔઆʹແཧ͕͋Δ͜ͱ͕Θ͔ΔɻখઆͷதͷΓΜ͝ͱ ͔ •
find_or_initialize_by ͷରԿͳΜͩʁ • ͏·͍͔͘ͳͦ͏
ڍಈͩͬͨΒ • ActiveRecord::Relation#find_or_initialize_by params Λ ड͚औͬͯΫΤϦΛΈཱͯͯϨίʔυΛ୳ͯ͠…ɻ • ͜Εڍಈɻ͋ΔछϓϩάϥϜʢ࣮ʣͷҙຯͱ͍͑ͦ͏Ͱ͋Δ ͕ɺͦΕʹ͚ͨϥϕϧͱͯ͠ͷ໊લͷҙຯͰͳ͍
• ͜Εͩͱத͕Θ͔Δ͜ͱ͕ҙຯ͕Θ͔Δ͜ͱʹͳͬͯ͠·͏ • ͏·͍͔͘ͳͦ͏
ײతʹΘ͔͍ͬͯΔ • ࢦࣔͩΊɺڍಈͩΊ • ͔͠͠զʑActiveRecord::Relation#find_or_initialize_by ͱ͍͏ϝιου໊ͷҙຯ͕Θ͔Δ • ʮݟ͚ͭΔ͔ɺͳ͔ͬͨΒ࡞Δʯ • ײతʹ͜͏͍͏ʮৼΔ͍ͷઆ໌ʯ͕ҙຯͰ͋Δɺͱࢥ͍ͬͯΔͷ
Ͱ • ※ ͍͑ͯΕΦοέʔɺͱ͍͏ʮҙຯͷ༻આʯ͕ϕʔε
ϓϩάϥϜʹ͓͚Δ໊લͷҙຯ = ৼΔ͍ͷઆ໌ • find_or_initialize_by ͷҙຯʮݟ͚ͭΔ͔ɺͳ͔ͬͨΒ࡞Δʯ • ҙຯ = ৼΔ͍ͷઆ໌
• ͬ͘͠Γ͘Δʂ
໊લͷ͘͠Έ ·ͱΊ • ϓϩάϥϜʹ͓͍ͯɺ • ໊લॲཧʹ͍ͭͨϥϕϧ • ໊લͷҙຯɺৼΔ͍ͷઆ໌
ͳΜͰ໊લॏཁͳͷ • ໊લ͕ศརͳͷΘ͔Γ·ͨ͠ • ΈΘ͔͖ͬͯͨ • Ͱɺ໊લ͕ʮѱ͍ʯͱԿ͕ى͜Δͷʁઆ໌͠·͢
ѱ໊͍લͰى͖Δ͜ͱ • ཧղͷίετ͕ߴ͍ • צҧ͍Ͱόά͕ൃੜ͢Δ • => ੜ࢈ੑ͕Լ͕Δ • ςΫϊϩδʔͷత࠶ར༻ʹΑΔੜ࢈ੑͷ্ɻͦΕΛѱ໊͍લ͛
Δ • ʮΑ͍ʯ໊લॏཁ
͡Ό͋ɺԿ͕Α໊͍લͳͷ • ʰίʔυɾίϯϓϦʔτʱͰௐͯΈ·ͨ͠ • ʮ໋໊ʹ͓͍ͯ࠷ॏཁͳߟྀ͖͢ɺม͕දݱ͢ΔͷΛਖ਼֬ʹ શʹݴ͍ද͍ͯ͠Δ͜ͱʯ • McConnell, Steve. Code
Complete (Kindle Location 6490). Microsoft Press. Kindle Edition) ༁ஶऀ • ʮਖ਼֬ʯͰʮશʯͳ໊લͬͯͲ͏͍͏ঢ়ଶͰ͔͢ʁ => ॻ͍ͯͳ͍ • Կ͕ྑ໊͍લͳͷ͔ॻ͍ͯͳ͍ͷͰɺߟ͑ͯΈ·ͨ͠
Α໊͍લ = ໊લͷҙຯͱ࣮ࡍͷڍಈ͕߹͍ͬͯΔͷ • ཁɺݴ͍ͬͯΔ͜ͱͱ͍ͬͯΔ͜ͱ͕Ұக͍ͯ͠Δ໊લ • ͦΓΌͦ͏ͩΑͶɺͱ͍͏ఆٛͳΜͰ͕͢ɺࡉ͔͘ཧղ͢ΔՁ͕͋Δ • ৄ͘͠આ໌͠·͢
໊લͷҙຯͱڍಈ͕߹͍ͬͯͳ͍ͱ • ໊લͷҙຯ͕ڍಈʹରͯ͠ڱ͗͢Δ • ݴ͍ͬͯΔ͜ͱΛ͍ͬͯͳ͍ • ໊લͷҙຯ͕ڍಈʹରͯ͗͢͠Δ • ͍ͬͯΔ͜ͱΛݴ͍ͬͯͳ͍ •
ͷ͍ͣΕ͔
ύλʔϯ 1: ໊લͷҙຯ͕ڱ͗͢Δ • ʮެ։Λ࠶ઃఆʯͬͯҙຯͳͷʹɺ࣌ࠁΛ࠶ઃఆͰ͖ͯ͠·͏ • ͬͯΔ͜ͱ໊͕લͷΘΓʹ͍ class Article def
reset_publish_date(date) update!(publish_at: date) end end
ύλʔϯ 2: ໊લͷҙຯ͕͗͢Δ • check ͨ݁͠ՌͲ͏ͳΔͷʁ • login ͍ͯ͠Δͷ͕ਖ਼ʁ͍ͯ͠ͳ͍ͷ͕ਖ਼ʁ •
໊લ͔ΒΘ͔Βͳ͍ • check ͷҙຯ͕͗͢Δͷ͕ݪҼ before_action :check_login private def check_login unless current_user redirect_to login_path end; end
Α໊͍લͷ͏Ұͭͷج४ γϯϓϧ͞ • ࠷ίϯύΫτͰత֬ͳදݱΛ͏͠ • ੈͷதʹ employee ͱ͍͏ݴ༿͕͋Δ def person_who_is_hired_by_company
def empolyee
͜͜·Ͱͷ·ͱΊ • Α໊͍લ = ໊લͷҙຯͱ࣮ࡍͷڍಈ͕߹͍ͬͯΔɺγϯϓϧͳ໊લ • ͗ͨ͢Γڱ͗ͨ͢Γ͢Δͱѱ໊͍લʹͳΔ
࣮ ѱ໊͍લ • ۩ମྫΛ͓ಧ͚͠·͢
User#check_paid class User def check_paid # ... end end
User#check_paid ͱ͍͏໊લ͔Βߟ͑ΒΕΔڍಈ • ࢧ͍͕ࡁΜ͔ͩΛ Boolean Ͱฦ͢ • ࢧ͍͕ࡁΜͰ͍ͳ͍߹Ϣʔβʔʹ self.errors ΛՃ͢Δ
• ࢧ͍͕ࡁΜͰ͍ͳ͍߹ྫ֎Λు͘ • check ͷҙຯ͕͗ͯ͢ɺͲΕ͔Θ͔Βͳ͍
User#check_paid ղମ • ͦΕͧΕԼهͷ༷ʹ࣮͞Ε͍ͯΕɺΉ͜ͱͳ͍ͣ • check Λ͏ͷΛΊΔ͚ͩͰ໊લ͕ྑ͘ͳΓ·͢ class User #
ࢧ͍͕ࡁΜ͔ͩΛ Boolean Ͱฦ͢ def paid? # ... end # ࢧ͍͕ࡁΜͰ͍ͳ͍߹ϢʔβʔʹΤϥʔใΛՃ͢Δ def add_error_if_not_paid # ... end end
Notification#user (1) • ௨Λड৴͢ΔϢʔβʔͷ໊લΛ'user'ͱͨ͠ class Notification belongs_to :user end
Notification#user (2) • ʮ͕ࣗૹͬͨ௨Λফ͢ʯͨΊʹɺԼهͷΑ͏ͳίʔυΛॻ͍ͨ • Notification#user ͕ड৴ऀͳͷ͔ૹ৴ऀͳͷ͔ɺ໊લ͔ΒΘ͔Βͳ͍ sent_notifications = Notification.where(user:
current_user) # user = ड৴ͨ͠ਓͳͷͰɺࣗͷ௨͕ফ͑Δ sent_notifications.delete_all
Notification#user (3) • 'recipient'ͱ͓͚ͯ͠ɺ໊લ͔Βड৴ऀͰ͋Δ͜ͱ͕Θ͔ΔͷͰɺ͜ͷ Α͏ͳࣄނى͖ͳ͍ • ໘ͰׂʹԠ໊ͨ͡લΛ͚ͭΔΑ͏ʹ͠·͠ΐ͏ # ໊લ͔Β໌Β͔ʹม sent_notifications
= Notification.where( recipient: current_user )
༨ஊ • ͔͜͜Β໊લʹ·ͭΘΔ༨ஊͰ͢
UserRegistrationService ͷ’Service'ͬͯඞཁʁ UserRegistrationService.new.perform! UserRegistration.new.perform! # Service͍Βͳ͘ͳ͍ʁ
໊લͷωλݩ • schema.org • Google, Microsoft, Yahoo, Yandex ͕࡞ͬͨΠϯλʔωοτ༻ͷޠኮू •
ςʔϒϧઃܭΜͩ࣌͜͜ΛݟΕ݁ߏࡌ͍ͬͯΔ
ࣙॻ.app • ໊લͷͨΊʹ࠷ॏཁͳπʔϧࣙॻ • Mac OS X ͷ ࣙॻ.app ਆ
• ͳΜͱӳӳࣙయɺྨޠࣙయɺӳࣙయɺӳࣙయ͕ɺશ෦ແྉͰೖ͍ͬͯΔ • ʮڥઃఆʯ͔ΒՃͰ͖ΔͷͰɺ·ͩͷํ͍·͙͢Ճ͠Α͏