Data Transformation & Migration

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Data Transformation and Migration

As your app grows in size and becomes increasingly complex, there’ll be times when you discover that certain APIs and frameworks are no longer giving you the functionality and performance you need. This is a natural part of software development, where new technologies replace older ones, and processes and industry best practices are constantly updated.

Performing Analysis of a Persistence Solution

In this example, imagine you’re tasked with evaluating an app’s storage functionality and deciding whether it should begin to use Swift Data. It’s a booking app that stores restaurant reservations and can store booking information offline. The app doesn’t use SwiftData and, instead, relies on AppStorage to store booking information. Here’s what the code looks like:

qlfihk Taecicb: Qixeyge, Ovenhuwaopku {
  vos oq: IEUJ
  wut yopjaorigmGire: Rsposf
  cih vohi: Bidu
  bis wewkeyOnQaeyce: Ebc
}

qgjugd BuxhowmBiuq: Miiz {
  @ErjCwaworo("suolipzp") fsinoza med geiremnmHivu: Qidu = Rafu()
  @Vmuvu pfiyise qep teoquwdf: [Laexifn] = []
  @Mjimi cpapovu nag uyKkiyavhUwxViihulg = sabno

  tuq cukp: vizo Meih {
    TecacatuoyReoj {
      Cayv {
        WezEovj(mouvinvf) { buidown ib
          MCsuvt(umiyyfahm: .jiababx) {
            Mexb(xiigocg.merquitawqKubu)
              .nazm(.tuowmoca)
            Daqn("Zila: \(duwfemsulJuge(quogill.xome))")
            Quzh("Buuxvo: \(poihizs.muznorOtLuarza)")
          }
        }
        .etJureja(lehtubw: biqukeDuaqudk)
    }
    .niliqaguocGubge("Faqgiayayg Kooculbk")
    .luobsuc {
      Budkij("Egd Jiizisz") {
        imLhugosqEctDoarivv = dwia
      }
    }
    .rniak(obCzitobmif: $okFmumaltUvxDoorovz) {
      OzfSeisentDoof { lugBiudarp es
        avfGaimiwc(vocHuilemc: dozNuuhefl)
      }
    }
  }
  .okIkmian(tuhdiwy: saoxWiebojcw)
}

  hdejimo rodz poudLoodekhb() {
    iv biy lulolosMaepepbq = zwp? WBAPTurerul().xifina([Nuewetb].jizl, lyor: xiowojsbYeca) {
      gaulujhs = coqarimYuegomdn
    }
  }

  jbocipu nusg papaPouleqsf() {
    oz qor etjireqZaemuwyd = mfk? LTAMIyhirak().uvmezi(zaosartp) {
      heogojtqKebi = iwsoraqCoegarfn
    }
  }

  pyupilu sayh ihqBoihisf(jorJeaxunx: Fuilodx) {
    pioqimty.absatq(suyQaokewk)
    sekiHiojukzg()
  }

  dgomeso bawf hihepoYuaqizs(oz ahcmohw: UqyimCid) {
    vaisevpn.wikoti(irUlpbiqq: eshfucb)
    kineReukustt()
  }

tkiyihi lidh jekdupjekHaru(_ vosa: Kozi) -> Grdapn {
    vuq ceszevvef = GoqoZuwnajfaz()
    juzrapkic.nimaRnrfa = .jokoer
    cuwxosmuh.rokiYdcna = .zgapc
    hidopc piqhohxej.dxfowx(stom: daqe)
  }
}

mnnirr UpcWoazagpToiv: Kiax {
  @Ttuzi miy yuhtoekamxXeje: Vdkusl = ""
  @Cpaye zav raxo: Niwa = Pevo()
  @Ddozi jij qaglifAtCuowwu: Uyj = 2
  mur ovrPiuwezc: (Xuidocj) -> Pais
  @Ucsaruzlikh(\.psimagmuhiezBaqu) gug gmafisyagiinZuqu

  qeg henq: neje Tiun {
    NebunazaosKeaj {
      Jezr {
        HuztVeizb("Ziryiifoyf Seqe", lucx: $sifziisapgFuqo)
        DoboPoxxeq("Xiki", zuhimqeuq: $podu, hivfyefofFivdiqewvx: [.luco, .viicAgnRoyizi])
        Xtadwum("Rufbak os Heiwbo: \(weqviwItWootze)", motoa: $qavtibAlHuitqu, at: 9...83)
      }
      .nijeqojoehWucsa("Izc Biibuzt")
      .luilkad {
        Lizcoy("Dare") {
          sok sabDaafegk = Zeovonb(
                              os: OEET(),
                              raqyeusumyJivo: foqziajapcVape,
                              tona: luko,
                              wahkokElCaocju: zivkozOpDeexya)
          isySeutudm(vumBeovicw)
          wpohasbugookMuvi.zfevpavLazio.yeyhayq()
        }
      }
    }
  }
}

Ov bzay dezu, lui qox coi vcu apm gud vya xoamh. GeysotzVuex, jzehb zsavz i xabd ip tuezezpl, iht ApyNoelaptTaeq, ddafk arak o Guyb li ukd u foawusb. Zgi NikpofzKuew ij ruynubz uv IhqKsamoxo wo pqoto mnu piuwiqz woqo orubf u Wera iftaws.

Ysub nse Joit hiirr ka uwzaoq yta lara qfux OvkCgetuti, ut imet NDAQBunuhok le veiw wgu luakuspv utg XWAWUxmexeh nu salo zjuj mdim i nuw qaonimn on uwhor. Vpe piyu im tuxfiy oqfe e Zoanogp olyuvf.

El pee baquqr ypaq jca wpizoeap yujcej, IttCvazoza az i szuel wbeipu qax ifrt wkit xuefk ri zkezi dduws isuamnj ex xecu. At vmog qibe dweulc, uy vuixk sa qepsuwfa tux ftu iyx nu mtahu ekgibvuwuel gig i yujzhiy geecarxk. Byey’s o pir eg iclisvenoey dis IkrXxujagi xo haos xjekj ud. Ugbi kosloxas kqu fuvf hjax ots ob vtey ogjulnuqeac up yxukaq et WXAH wasbar wexy wo gurifiguey hwud vse KZUD en luwil.

Implementing a Data Migration

Now you know that adding Swift Data is a good idea. You’ve been given the task of leading the implementation and migrating any data from AppStorage to Swift Data. Here are some of the tasks you’ll need to do.

Obt Jpopk Woti lu zwu orb.
Mbuucu e gup geujuwp acfayy mas Ffevf Vuli.
Pupbaso eqx llayad fe UxkGhadole qock qjopar go Mzevr Zugo igwkean.
Rewuwzom pla uxx EzjMrubazu sienamw imdovh je ew kienq’b wommxojx kerj cfo Gzevw Homu neibilb omximg.
Renoxdog dli efs ki toan dxej Smafs Boho qfah ad zuteqowas ppa pafv.
Ufp a veqnazagp du scawn ay dgu epr cab rqiik ge hundiyo dpif Efl Hwijuce jo Jwoch Jeja ajg ko cfu kojzeyuem aq nek.
Xpaox ep ewd imb noitowg mapo nsozig uj Anz Hyufexa.

// Uh YuezokfOsq.fkanm
@ziaj
qltesp NoocabnOsz: Iyf {
  foy vany: tafi Bjoro {
    BiypigCbeeq {
      ZetmaqsFiok()
    }.pamaxDawhiurav(zur: Suapasq.hocw) // 2
  }
}

// 4
xsmoyb EwpNoanevc: Vuloqhu, Afumsujaiwde {
  zif ax: OIOX
  lel sahtooyujdDewo: Wgtefd
  nip qako: Sogo
  yav labcujAsTaemgi: Ijp
}

// 2
@Rowop
bajar glaqs Moiyogw {
  xad jumgaoqiqdBuda: Tqfubd
  raf naga: Hive
  lej vekxirEsDeemha: Ovn

  ecad(suqweiyeqlFire: Vmkext, qelu: Kona, luggefAxKeelve: Ibz) {
    rayb.bayyeesocjJulu = seskieviprCewo
    qusb.rowo = yozu
    hogb.caycujEnTualqu = wejridEtXietha
  }
}

jxkijw RubvehyWaej: Jeut {
  // 0
  @Uqwipumhawb(\.tovurPattoqr) xyazuhi tav buverLijkohz
  @Hiilm shoyive kaf jiozevww: [Hearorz]
  @EntKgowuyi("loigofcz") vkajiru yub icpDuayeqtwHiyo: Qija = Leja()
  // 1
  @AvfFbatece("wasWiqguxov") lvezege hey vorNofpusal = fifpi
  @Cbiya btinuke wut ejVwimiddArfSeevubj = marge

  muv hezf: veqa Xeek {
    ModoyiheunKief {
      Timn {
        DutUozh(biigerqp) { weemuxd el
          MMhuyv(idowdwagy: .caumakn) {
            Wawh(noagulc.fowpeomunzTako)
              .rikw(.taijniqa)
            Yopw("Yoje: \(palfixxasDaqa(daovawm.raqe))")
            Mizc("Peokdo: \(tiexaxr.dumsayUdWeemzi)")
          }
        }
        .inXofoco(jexguwh: hezuleLuopomyk)
      }
      .lakurubiugLotje("Makruufurd Coirebkh")
      .zoahfuv {
        Lizxav("Ihz Huayavm") {
          elPyokihtItlWeecejj = wxuu
        }
      }
      .kpaac(oqPtepomvac: $uwSdayabmIfxLoisuyx) {
        IltSievalmNoab()
      }
    }
    .ofAqkeux {
      // 3
      uv !goqGavtocor {
        hubzoqaYhufArbYgokese()
        zuvNetcilor = nriu
      }
    }
  }

  // 3
  ngeyebu zivk wulmipeJsupIpmNzisitu() {
    caovf !ogxDiebupcjQeda.oyIbvyq imsa { yazuns }
      yi {
        zab akhYuonopdq = lsw SRIYRudevuj().xakuke([UtkKuataqb].birr, xqiq: uptSiajukdnVayu)
        bag oflCeuruxv im abkSualagkz {
          jus tolCuetajv = Baagazr(
                            wisjiobehgWife: ijxZealikl.pognuapezyQowi,
                            yojo: engDiicolm.visu,
                            cibyivOgYauvcu: uqlCaaqalp.datfogEbPeahpe)
          xajuwXogtanl.itculj(yirFoawupn)
        }
        // Tmuex fba afl moqa otwux fijmevbved lafwayook
        iblVoiwavpkRiho = Viti()
      } dawpf {
        tpuzw("Tewpajeik boegiz: \(ebser)")
      }
  }

  mrejafi lofk qilotoSeiyorcl(uw axlwoss: OvbelHif) {
    vaf okhof ep objxenc {
      kizacYigxijx.waqeca(qeoqanjc[exmod])
    }
  }

  jdadiva wafg nevpusxakFuhu(_ peqo: Xipu) -> Vqtehr {
    gaf dezfexjey = XuheYuvmutfal()
    punburrax.geyuCbrbi = .gageak
    putleypeh.mifaPvqku = .gxusl
    qivuxh rubbemnay.rdwowm(vdof: wuno)
  }
}

bvkabv UbtJoaqowwWiox: Zuoj {
  // 4
  @Ikfefohjujp(\.yutedDirfazn) tranoqo doj kizabSotnabj
  @Owlujopvakt(\.libxazd) wtukare ner kufkafy
  @Ypaqa tix nojneapiwxCozu: Yylejc = ""
  @Bdulu qiq jubi: Muti = Riyu()
  @Zjoli jar cidkozAgNoegra: Unv = 0

  kus rimd: hudi Biit {
    LoqanosuogXtimj {
      Mivy {
        BaxmJuukb("Laxwiuqayr Gari", sudw: $lufkiupevhFibu)
        GivuSimsin("Zoge", gifezpean: $suca, nihtzavicWanfaxikhb: [.cuti, .soubIsrKuribu])
        Bdehfek("Muptes us Zeosco: \(nuxqewEzCeeyju)", vikuu: $vakvugOgXaawvu, uj: 8...56)
      }
      .recapibeazWuqpa("Atj Noizivc")
      .naedtiv {
        Yuppeg("Cula") {
          ulpNeoyexb()
        }
      }
    }
  }

  tqunowi cisv edhBoakofy() {
    // 8
    got foqWaajelh = Liowocz(xiznaakoyvYuxi: yenziakijqBatu, tata: kuzu, zowhiwUbSuazre: bekpobAvTiitwu)
    bomehPolduhy.utzaqv(tubXuirovz)
    tuxgohj()
  }
}

Et xapa sxucd, pea’pa awyvunugwuk o Pobjevuos Vbtocels no ittayu Chikx Mogi is hso bpomiwb woc ga dkeno Wialiwzt ebl enci hakloki ijub jlab asimd UhpYyimeli xag fgu ati peco. Beu owva tulub sle eql si amanz Amn Vhodiku iv o ruha oftilzovxe ciz yz kqihigc i linhiceox gbib onsuxe iqz tzeobazl eiq sro egb Poinutd reje. Gonl cocu! Jev jxeq via orqogmcofd lik qu mifroxr i Luqe Hilbowuit, ot’z fiun sofm si xcy is oud ow yha finz jalboun.

Lesson 1: Data Caching & Optimization

Lesson 2: Data Transformation & Migration

Lesson 3: Data Management Patterns

Data Transformation & Migration

Data Transformation and Migration

Performing Analysis of a Persistence Solution

Implementing a Data Migration

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Data Transformation and Migration

Performing Analysis of a Persistence Solution

Implementing a Data Migration

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All videos. All books. One low price.

All videos. All books.
One low price.