秩序あるKotlinの拡張 / Orderly Kotlin Extensions

Transcript

1. ©2021 Wantedly, Inc. டং͋ΔKotlinͷ֦ு potatotips #74 2021/06/23 ٱอग़խढ़

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7. ©2021 Wantedly, Inc. w ෳ਺ͷGSBHNFOUΛ͏·͘อଘ͍ͨ͠
   fragmentͱ͸ • σʔλϞσϧΛஅยԽͨ͠΋ͷ • ಉ͡ϞσϧΛࢦ͕͢৘ใྔ͕ҧ͏

   • ҰཡͰ͸࠷খݶ • ৄࡉͰ͸࠷େݶ Ϟσϧ͸ಉ͡ͳͷͰɺ ಉ͡ςʔϒϧʹอଘ͍ͨ͠ ΍Γ͍ͨ͜ͱ fragment ProfileMini on Profile { userId name avatarUrl } fragment ProfileDetail on Profile { userId name avatarUrl coverImageUrl introduction tagline statement # ... all fields }

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9. ©2021 Wantedly, Inc. w ୯७ʹ֦ுΛॻ͍ͨ Ͳ͏͔ͨ͠ʁ fun Db.merge(fragment: ProfileMiniFragment) {

   profilePageQueries.upsertMiniFragment( userId = UserId(fragment.userId), // ... ) }

10. ©2021 Wantedly, Inc. ໰୊఺ fun Db.merge(fragment: ProfileMiniFragment) { profilePageQueries.upsertMiniFragment( userId

    = UserId(fragment.userId), // ... ) } ໊લʹറΓ͕ͳ͍ɺ໎͏ mergeDetail, saveͱ͔ϒϨ΍͍͢ Ҿ਺ʹറΓ͕ͳ͍ interfaceͰ੍໿Λ͍࣋ͨͤͨʂ

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    PCKFDU಺֦ுؔ਺

12. ©2021 Wantedly, Inc. PCKFDU಺֦ுؔ਺ object Foo { fun String.hello() {

    println("Hello, $this") } } object಺ʹ֦ுؔ਺Λ࡞Δ ී௨ͷ֦ுؔ਺ͷΑ͏ʹར༻Ͱ͖Δ import Foo.hello fun main() { "World".hello() }

13. ©2021 Wantedly, Inc. ղܾख๏ internal interface Merger<FragmentT> { fun Db.merge(fragment:

    FragmentT) } internal object ProfileMiniFragmentMerger : Merger<ProfileMiniFragment> { override fun Db.merge(fragment: ProfileMiniFragment) { profilePageQueries.upsertFragment( userId = UserId(fragment.userId), // ... ) } } // Repository fun fetchMiniList() { val miniList = api.query(GetProfileMiniListQuery()) db.transaction { miniList.forEach { db.merge(it) } } } internal object ProfileDetailFragmentMerger : Merger<ProfileDetailFragment> { override fun Db.merge(fragment: ProfileDetailFragment) { profilePageQueries.upsertFragment( userId = UserId(fragment.userId), // ... ) } } // Repository fun fetchDetail() { val detail = api.query(GetProfileDetailQuery()) db.merge(detail) } ֦ுؔ਺Λ࣋ͭ object΁࣮૷ object಺֦ுؔ਺ΛݺΜͰ͍Δ

14. ©2021 Wantedly, Inc. w JOUFSGBDFͱPCKFDU಺֦ுؔ਺Ͱɺ֦ுʹடংΛ ΋ͨͤΔ͜ͱ͕Ͱ͖Δ
    w ࠜຊతʹ͸ίʔυੜ੒ͱ͔ͰϘΠϥʔϓϨʔτΛ ݮΒ͢΂͖ʜ ·ͱΊ

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