CodableでカオスなJSONに対応していく/Otemachi02

Transcript

1. $PEBCMFͰΧΦεͳ+40/ ʹରԠ͍ͯ͘͠ 0UFNBDIJTXJGU
   
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2. OPQQF !
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   ϥΠϒ഑৴J04ΞϓϦ #
   ͖ͭͶ͔Θ͍͍ $
   0UFNBDIJTXJGUॳࢀઓ 
3. ελϯμʔυͳ+40/ 
4. $PEBCMFͰϚοϐϯά struct UserData { let id: String } let decoder = JSONDecoder() let userData = try decoder.decode(Response.self, data: data) 
5. ੈͷதʹ͸ΧΦεͳ+40/͕͋Δ ࠓ೔͸̎ͭ঺հ 
6. ࣄྫ 
7. ͜ͷ+40/Կ͕͓͔͍͠Ͱ͔͢ 
8. TOBLF@DBTFͱLFCBC DBTF͕ࠞ߹͍ͯ͠Δʂ 
9. TOBLF@DBTFҎ֎͕ࠞͬ͟ ͍ͯΔͱ ,FZ%FDPEJOH4USBUFHZ͕ ࢖͑ͳ͍ʜ 
10. ,FZ%FDPEJOH4USBUFHZͱ͸ʁ 4XJGU
    
    ʙ +40/Ωʔ໊ϓϩύςΟ໊ͷϧʔϧΛࢦఆ ͢ΔࣄͰɺCodingKey΍init(from decoder:)Λ࣮૷ͤͣʹϚοϐϯάग़དྷΔ 
11. ,FZ%FDPEJOH4USBUFHZͱ͸ʁ let decoder = JSONDecoder() decoder.keyDecodingStrategy = .convertFromSnakeCase let obj = try decoder.decode(Response.self, from: data) 
12. େৎ෉ 
13. ΧελϜσίʔυϧʔϧ decoder.keyDecodingStrategy = .custom { keys in let lastComponent = keys.last!.stringValue.camelCase return AnyKey(stringValue: String(lastComponent))! } ΧελϜͳLFZ%FDPEJOH4USBUFHZΛ࡞Δࣄ ͕Ͱ͖Δɻ 
14. TOBLF@DBTF
    PS
    LFCBCDBTF
    UP
    DBNFM$BTF extension String { internal var camelCase: String { return self.replacingOccurrences(of: "-", with: "_") .components(separatedBy: "_") .enumerated() .map { 0 == $0 ? $1 : $1.capitalized } .joined() } } 
15. ࣄྫ̎ 
16. ͜ͷ+40/Կ͕͓͔͍͠Ͱ͔͢ 
17. 
18. ܕ͕ෆఆ 
19. ܕ͕ෆఆ w Ұճ"OZʹ٧ΊͯɺऔΓग़࣌͢ʹܕΛ෇͚ ͯ͋͛Δ w ଘࡏ͠͏Δ͢΂ͯͷϑΟʔϧυΛ࣋ͬͨΦ ϒδΣΫτʹϚοϐϯά͢Δ w %JDUJPOBSZͰ࣋ͭ 
20. ܕ͕ෆఆ struct AttachmentObject: Decodable { let value: Any init(from decoder: Decoder) throws { let container = try decoder.singleValueContainer() if let value = try? container.decode(Media.self) { self.value = value } else if let value = try? container.decode([Media].self) { self.value = value } else { preconditionFailure() } } } 
21. ܕ͕ෆఆ ࢖͏ͱ͖͸TXJUDIͳͲͰ෼ذ switch object.data.value { case let value as Media: print(value.id) case let value as [Media]: print(value.compactMap({ $0.id })) default: break } 
22. ! ͳΜ͔ଞʹྑ͍ํ๏͕͋Δؾ͕͢ΔͷͰɺ ஌͍ͬͯΔਓ͕͍ͨΒڭ͍͑ͯͩ͘͞ 
23. ͦ΋ͦ΋ ͳΜͰ͜ΜͳKTPOύʔεͯ͠Δͷʁʁ 
24. HBCBJ "1*ΫϥΠΞϯτϥΠϒϥϦΛ࡞ͬͯ·͢ 
25. OPQQFGPYXPMG(BC,JU ࠓճͷςΫχοΫͰ࣮૷ͯ͠·͢ HBC·ͩ·ͩ೔ຊਓগͳ͍ͷͰɺڵຯ͋Δਓ ͸࢖ͬͯΈ͍ͯͩ͘͞ʙʙ 
26. $JSPOOVQ
    
    νψϩοϓ HBCDPNͷJ04ωΠςΟϒΞϓϦɻ৹ࠪத 
27. ͋Γ͕ͱ͏͍͟͝·ͨ͠