໓ɾαʔϏεΫϥε Roppongi.rb #27 2025/02/13 1

ࣗݾ঺հ • ໊લ: ਖ਼ಙ ޼(aka: ਆ଎) • GitHub: @sinsoku (ը૾ӈ্) • X: @sinsoku_listy (ը૾ӈԼ) • Railsྺ: 10೥͘Β͍ 2

એ఻: ! sinsoku/rbs-trace • ςετͷ࣮ߦ࣌ʹܕ৘ใΛऩू • ࣗಈతʹ rbs-inline ͷίϝϯτΛૠೖ • ։ൃதʢmain ϒϥϯνͷར༻Λਪ঑ʣ 3

αʔϏεΫϥεʹ͍ͭͯ 4

αʔϏεΫϥεͱ͸ • αʔϏεͷػೳΛදݱ͢ΔΫϥε • ෳ਺ϞσϧΛѻ͏Ϋϥε • ϏδωεϩδοΫΛѻ͏Ϋϥε • υϝΠϯۦಈʢDDDʣ 5

2025-02-12 6

2024-11-05 7

2023-10-05 8

2022-03-30 9

αʔϏεΫϥεΛ࡞Βͳ͍ٕज़ 10

! FormObjectʹΑΔΞϓϩʔν Railsͷ࢓૊ΈΛཧղͯ͠ϞσϧΛ্खʹҭͯΔ1 by igaiga 1 https://speakerdeck.com/igaiga/kaigionrails2024/ 11

⭐ ผख๏: ActiveRecord::Callbacks Λ࢖͏ • 1ͭͷτϥϯβΫγϣϯʹͳΔ • before_validation ͔ΒτϥϯβΫγϣϯʹؚ·ΕΔ2 • ϞσϧʹϩδοΫ͕ू໿͞ΕΔ • Immutable Data Model લఏͰઃܭ͢Δ 2 SQLΛൃߦ͠ͳ͍৔߹͸τϥϯβΫγϣϯͷ։࢝͸஗Ԇ͞ΕΔ 12

ྫ: Ϣʔβʔ͕ୀձ͢Δʢ࿦ཧ࡟আʣ 13

NG: UserArchiveServiceΛ࡞Δ class UsersController # POST /users/:id/archive def archive service = UserArchiveService.new(current_user) if service.call head :ok else head :bad_request end end end 14

NG: UserArchiveServiceΛ࡞Δ class UserArchiveService validate :unpaid_fees_must_not_exist def initialize(user) @user = user end def call ActiveRecord:"Base.transaction do # `users.deleted_at` ʹݱࡏ೔࣌Λอଘ # ؔ࿈͢ΔσʔλΛߋ৽͢Δ end end end 15

OK: ArchiveϞσϧΛ࡞Δ class ArchivesController def create archive = Archive.new(user: current_user) if archive.save head :ok else head :bad_request end end end 16

OK: ArchiveϞσϧΛ࡞Δ class Archive < ApplicationRecord belongs_to :user validate :unpaid_fees_must_not_exist after_create :set_deleted_at, :update_related_data private def set_deleted_at user.update!(archived_at: Time.current) end def update_related_data # ؔ࿈͢ΔσʔλΛߋ৽͢Δ end end 17

OK: ArchiveϞσϧΛ࡞ΔʢActiveModel൛ʣ class Archive include ActiveModel:"Model extend ActiveModel:"Callbacks def initialize(user:) @user = user end def save # ϝΠϯͷॲཧ end end 18

! ·ͱΊʢ͕࣌ؒ଍Γͳ͔ͬͨ...ʣ • CallbacksΛ࢖͏ͷ΋ѱ͘ͳ͍ • accepts_nested_attributes_for ͷར༻΋ѱ͘ͳ͍ • ͨͩ͠ Immutable Data Model Λҙࣝ͢Δ • 1ͭͷϞσϧʹ Callbacks ͕ଟ͘ͳΓෳࡶʹͳΔͨΊ ଓ͖͸࠙਌ձͰ࿩͠·͠ΐ͏ !" 19