I am a new kotlin programmer and I cant create data class for json file. I always run into a problem. I've worked with simple json files before, but this confused me a bit. How can I convert this json file to data class. By the way, I tried the json to data class, which is an extension of kotlin, then it outputs a data class like this, frankly, this is not a very readable data class, does anyone have a better idea?
my json file
{
"result":"success",
"documentation":"https://www.exchangerate-api.com/docs",
"terms_of_use":"https://www.exchangerate-api.com/terms",
"time_last_update_unix":1669939202,
"time_last_update_utc":"Fri, 02 Dec 2022 00:00:02 0000",
"time_next_update_unix":1670025602,
"time_next_update_utc":"Sat, 03 Dec 2022 00:00:02 0000",
"base_code":"USD",
"conversion_rates":{
"USD":1,
"AED":3.6725,
"AFN":88.0236,
"ALL":112.3100,
"AMD":395.3092,
"ANG":1.7900,
"AOA":509.4547,
"ARS":166.9052,
"AUD":1.4696,
"AWG":1.7900,
"AZN":1.6980,
"BAM":1.8638,
"BBD":2.0000,
"BDT":101.4835,
"BGN":1.8647,
"BHD":0.3760,
"BIF":2053.3857,
"BMD":1.0000,
"BND":1.3561,
"BOB":6.9195,
"BRL":5.1984,
"BSD":1.0000,
"BTN":81.0572,
"BWP":13.0619,
"BYN":2.6482,
"BZD":2.0000,
"CAD":1.3433,
"CDF":2054.6915,
"CHF":0.9394,
"CLP":890.3480,
"CNY":7.0548,
"COP":4815.7969,
"CRC":601.6168,
"CUP":24.0000,
"CVE":105.0763,
"CZK":23.2743,
"DJF":177.7210,
"DKK":7.1093,
"DOP":54.3860,
"DZD":138.5331,
"EGP":24.5835,
"ERN":15.0000,
"ETB":53.4963,
"EUR":0.9530,
"FJD":2.1960,
"FKP":0.8183,
"FOK":7.1093,
"GBP":0.8183,
"GEL":2.7103,
"GGP":0.8183,
"GHS":14.1003,
"GIP":0.8183,
"GMD":63.3901,
"GNF":8622.0204,
"GTQ":7.8232,
"GYD":209.1401,
"HKD":7.7836,
"HNL":24.6064,
"HRK":7.1800,
"HTG":140.8970,
"HUF":392.6534,
"IDR":15442.8385,
"ILS":3.4027,
"IMP":0.8183,
"INR":81.0584,
"IQD":1458.8962,
"IRR":42036.3612,
"ISK":142.4758,
"JEP":0.8183,
"JMD":153.8702,
"JOD":0.7090,
"JPY":135.7224,
"KES":123.1351,
"KGS":84.4410,
"KHR":4125.2930,
"KID":1.4694,
"KMF":468.8174,
"KRW":1303.6280,
"KWD":0.2996,
"KYD":0.8333,
"KZT":468.1697,
"LAK":17248.0199,
"LBP":1507.5000,
"LKR":363.4521,
"LRD":153.9744,
"LSL":17.5733,
"LYD":4.8894,
"MAD":10.6209,
"MDL":19.4574,
"MGA":4349.9903,
"MKD":59.4362,
"MMK":2552.4090,
"MNT":3422.5815,
"MOP":8.0171,
"MRU":38.0126,
"MUR":43.4017,
"MVR":15.4048,
"MWK":1032.9387,
"MXN":19.1778,
"MYR":4.4020,
"MZN":63.9513,
"NAD":17.5733,
"NGN":443.8839,
"NIO":36.3799,
"NOK":9.7593,
"NPR":129.6915,
"NZD":1.5722,
"OMR":0.3845,
"PAB":1.0000,
"PEN":3.8347,
"PGK":3.5199,
"PHP":56.1010,
"PKR":224.1295,
"PLN":4.4704,
"PYG":7217.3743,
"QAR":3.6400,
"RON":4.6970,
"RSD":112.1709,
"RUB":61.1764,
"RWF":1114.9049,
"SAR":3.7500,
"SBD":8.1036,
"SCR":13.0656,
"SDG":568.0316,
"SEK":10.3601,
"SGD":1.3561,
"SHP":0.8183,
"SLE":18.6210,
"SLL":18620.9957,
"SOS":568.2695,
"SRD":30.9539,
"SSP":644.4877,
"STN":23.3471,
"SYP":2504.9740,
"SZL":17.5733,
"THB":34.8989,
"TJS":10.1357,
"TMT":3.4988,
"TND":2.9893,
"TOP":2.3706,
"TRY":18.6279,
"TTD":6.7555,
"TVD":1.4694,
"TWD":30.4630,
"TZS":2334.9042,
"UAH":36.4641,
"UGX":3745.5147,
"UYU":39.4017,
"UZS":11238.8195,
"VES":11.2548,
"VND":24496.1101,
"VUV":120.8927,
"WST":2.7081,
"XAF":625.0899,
"XCD":2.7000,
"XDR":0.7578,
"XOF":625.0899,
"XPF":113.7166,
"YER":250.1010,
"ZAR":17.5753,
"ZMW":17.0952,
"ZWL":654.0107
}
}
json to data class kotlin plugin
@Serializable
data class ExchangeDto(
val base_code: String,
val conversion_rates: ConversionRates,
val documentation: String,
val result: String,
val terms_of_use: String,
val time_last_update_unix: Int,
val time_last_update_utc: String,
val time_next_update_unix: Int,
val time_next_update_utc: String
)
@Serializable
data class ConversionRates(
val AED: Double,
val AFN: Double,
val ALL: Double,
val AMD: Double,
val ANG: Double,
val AOA: Double,
val ARS: Double,
val AUD: Double,
val AWG: Double,
val AZN: Double,
val BAM: Double,
val BBD: Double,
val BDT: Double,
val BGN: Double,
val BHD: Double,
val BIF: Double,
val BMD: Double,
val BND: Double,
val BOB: Double,
val BRL: Double,
val BSD: Double,
val BTN: Double,
val BWP: Double,
val BYN: Double,
val BZD: Double,
val CAD: Double,
val CDF: Double,
val CHF: Double,
val CLP: Double,
val CNY: Double,
val COP: Double,
val CRC: Double,
val CUP: Double,
val CVE: Double,
val CZK: Double,
val DJF: Double,
val DKK: Double,
val DOP: Double,
val DZD: Double,
val EGP: Double,
val ERN: Double,
val ETB: Double,
val EUR: Double,
val FJD: Double,
val FKP: Double,
val FOK: Double,
val GBP: Double,
val GEL: Double,
val GGP: Double,
val GHS: Double,
val GIP: Double,
val GMD: Double,
val GNF: Double,
val GTQ: Double,
val GYD: Double,
val HKD: Double,
val HNL: Double,
val HRK: Double,
val HTG: Double,
val HUF: Double,
val IDR: Double,
val ILS: Double,
val IMP: Double,
val INR: Double,
val IQD: Double,
val IRR: Double,
val ISK: Double,
val JEP: Double,
val JMD: Double,
val JOD: Double,
val JPY: Double,
val KES: Double,
val KGS: Double,
val KHR: Double,
val KID: Double,
val KMF: Double,
val KRW: Double,
val KWD: Double,
val KYD: Double,
val KZT: Double,
val LAK: Double,
val LBP: Double,
val LKR: Double,
val LRD: Double,
val LSL: Double,
val LYD: Double,
val MAD: Double,
val MDL: Double,
val MGA: Double,
val MKD: Double,
val MMK: Double,
val MNT: Double,
val MOP: Double,
val MRU: Double,
val MUR: Double,
val MVR: Double,
val MWK: Double,
val MXN: Double,
val MYR: Double,
val MZN: Double,
val NAD: Double,
val NGN: Double,
val NIO: Double,
val NOK: Double,
val NPR: Double,
val NZD: Double,
val OMR: Double,
val PAB: Double,
val PEN: Double,
val PGK: Double,
val PHP: Double,
val PKR: Double,
val PLN: Double,
val PYG: Double,
val QAR: Double,
val RON: Double,
val RSD: Double,
val RUB: Double,
val RWF: Double,
val SAR: Double,
val SBD: Double,
val SCR: Double,
val SDG: Double,
val SEK: Double,
val SGD: Double,
val SHP: Double,
val SLE: Double,
val SLL: Double,
val SOS: Double,
val SRD: Double,
val SSP: Double,
val STN: Double,
val SYP: Double,
val SZL: Double,
val THB: Double,
val TJS: Double,
val TMT: Double,
val TND: Double,
val TOP: Double,
val TRY: Double,
val TTD: Double,
val TVD: Double,
val TWD: Double,
val TZS: Double,
val UAH: Double,
val UGX: Double,
val USD: Int,
val UYU: Double,
val UZS: Double,
val VES: Double,
val VND: Double,
val VUV: Double,
val WST: Double,
val XAF: Double,
val XCD: Double,
val XDR: Double,
val XOF: Double,
val XPF: Double,
val YER: Double,
val ZAR: Double,
val ZMW: Double,
val ZWL: Double
)
I think it's a bad translation when it's like this. How can I improve this or how can I create my own data class
CodePudding user response：
You can do it like this. Instead of having each field for each currencies, you can make coversion_rates as Map , so currency will be the key and value will the currency value. So it will be easier for iterating all currencies, getting value from currency name and so on...
@Serializable
data class ExchangeDto(
val base_code: String,
@TypeConverters(MapTypeConverter::class) //Add annotation
val conversion_rates: Map<String,Double>,
val documentation: String,
val result: String,
val terms_of_use: String,
val time_last_update_unix: Int,
val time_last_update_utc: String,
val time_next_update_unix: Int,
val time_next_update_utc: String
)
Edit:
Type converter for currency map:
object MapTypeConverter {
@TypeConverter
@JvmStatic
fun covertStringToMap(value: String): Map<String, String> {
return Gson().fromJson(value, object : TypeToken<Map<String, String>>() {}.type)
}
@TypeConverter
@JvmStatic
fun mapToString(value: Map<String, String>?): String {
return if(value == null) "" else Gson().toJson(value)
}
}