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$PEBCMFͰΧΦεͳ+40/ ʹରԠ͍ͯ͘͠ 0UFNBDIJTXJGUOPQQF !OPQQFGPYXPMG

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OPQQF ! σΟʔɾΤψɾΤʔ " ϥΠϒ഑৴J04ΞϓϦ # ͖ͭͶ͔Θ͍͍ $ 0UFNBDIJTXJGUॳࢀઓ

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ελϯμʔυͳ+40/

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$PEBCMFͰϚοϐϯά struct UserData { let id: String } let decoder = JSONDecoder() let userData = try decoder.decode(Response.self, data: data)

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ੈͷதʹ͸ΧΦεͳ+40/͕͋Δ ࠓ೔͸̎ͭ঺հ

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ࣄྫ

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͜ͷ+40/Կ͕͓͔͍͠Ͱ͔͢

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TOBLF@DBTFͱLFCBC DBTF͕ࠞ߹͍ͯ͠Δʂ

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TOBLF@DBTFҎ֎͕ࠞͬ͟ ͍ͯΔͱ ,FZ%FDPEJOH4USBUFHZ͕ ࢖͑ͳ͍ʜ

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,FZ%FDPEJOH4USBUFHZͱ͸ʁ 4XJGUʙ +40/Ωʔ໊ϓϩύςΟ໊ͷϧʔϧΛࢦఆ ͢ΔࣄͰɺCodingKey΍init(from decoder:)Λ࣮૷ͤͣʹϚοϐϯάग़དྷΔ

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,FZ%FDPEJOH4USBUFHZͱ͸ʁ let decoder = JSONDecoder() decoder.keyDecodingStrategy = .convertFromSnakeCase let obj = try decoder.decode(Response.self, from: data)

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େৎ෉

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ΧελϜσίʔυϧʔϧ decoder.keyDecodingStrategy = .custom { keys in let lastComponent = keys.last!.stringValue.camelCase return AnyKey(stringValue: String(lastComponent))! } ΧελϜͳLFZ%FDPEJOH4USBUFHZΛ࡞Δࣄ ͕Ͱ͖Δɻ

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TOBLF@DBTFPSLFCBCDBTFUP DBNFM$BTF extension String { internal var camelCase: String { return self.replacingOccurrences(of: "-", with: "_") .components(separatedBy: "_") .enumerated() .map { 0 == $0 ? $1 : $1.capitalized } .joined() } }

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ࣄྫ̎

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͜ͷ+40/Կ͕͓͔͍͠Ͱ͔͢

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ܕ͕ෆఆ

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ܕ͕ෆఆ w Ұճ"OZʹ٧ΊͯɺऔΓग़࣌͢ʹܕΛ෇͚ ͯ͋͛Δ w ଘࡏ͠͏Δ͢΂ͯͷϑΟʔϧυΛ࣋ͬͨΦ ϒδΣΫτʹϚοϐϯά͢Δ w %JDUJPOBSZͰ࣋ͭ

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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() } } }

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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 }

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! ͳΜ͔ଞʹྑ͍ํ๏͕͋Δؾ͕͢ΔͷͰɺ ஌͍ͬͯΔਓ͕͍ͨΒڭ͍͑ͯͩ͘͞

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ͦ΋ͦ΋ ͳΜͰ͜ΜͳKTPOύʔεͯ͠Δͷʁʁ

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HBCBJ "1*ΫϥΠΞϯτϥΠϒϥϦΛ࡞ͬͯ·͢

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OPQQFGPYXPMG(BC,JU ࠓճͷςΫχοΫͰ࣮૷ͯ͠·͢ HBC·ͩ·ͩ೔ຊਓগͳ͍ͷͰɺڵຯ͋Δਓ ͸࢖ͬͯΈ͍ͯͩ͘͞ʙʙ

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$JSPOOVQνψϩοϓ HBCDPNͷJ04ωΠςΟϒΞϓϦɻ৹ࠪத

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͋Γ͕ͱ͏͍͟͝·ͨ͠