我有多层次的Json，我想为https://blockchain.info/ticker创建一个模型
这是我所做的工作无助于将其序列化为列表，就像我无法访问外部和内部Maps一样:
final double delay;
final double recentMarketPprice;
final double buyPrice;
final double sellPrice;
final String symbol;
BitRateValues(
{this.delay,
this.recentMarketPprice,
this.buyPrice,
this.sellPrice,
this.symbol});
factory BitRateValues.fromMap(Map<String, dynamic> data) {
return BitRateValues(
delay: data['15m'],
recentMarketPprice: data['last'],
buyPrice: data['buy'],
sellPrice: data['sell'],
symbol: data['symbol']);
}
}
class BitRateMAp {
Map<String, BitRateValues> bits;
BitRateMAp({this.bits});
}```
please kinldy help
最佳答案
欢迎来到SO。我建议下次将所有相关的代码和数据样本放入您的问题中。这样，如果API更改，URL损坏等，将来的读者仍然可以使用问题和答案。
所有这些货币都是JSON对象(“USD”，“AUD”等)，而不是数组。因此，为了使用该JSON，必须将它们全部声明。
JSON:
{
"USD" : {"15m" : 10956.55, "last" : 10956.55, "buy" : 10956.55, "sell" : 10956.55, "symbol" : "$"},
"AUD" : {"15m" : 15023.62, "last" : 15023.62, "buy" : 15023.62, "sell" : 15023.62, "symbol" : "$"},
"BRL" : {"15m" : 59143.45, "last" : 59143.45, "buy" : 59143.45, "sell" : 59143.45, "symbol" : "R$"},
"CAD" : {"15m" : 14461.13, "last" : 14461.13, "buy" : 14461.13, "sell" : 14461.13, "symbol" : "$"},
"CHF" : {"15m" : 9982.46, "last" : 9982.46, "buy" : 9982.46, "sell" : 9982.46, "symbol" : "CHF"},
"CLP" : {"15m" : 8363136.86, "last" : 8363136.86, "buy" : 8363136.86, "sell" : 8363136.86, "symbol" : "$"},
"CNY" : {"15m" : 74164.87, "last" : 74164.87, "buy" : 74164.87, "sell" : 74164.87, "symbol" : "¥"},
"DKK" : {"15m" : 68828.23, "last" : 68828.23, "buy" : 68828.23, "sell" : 68828.23, "symbol" : "kr"},
"EUR" : {"15m" : 9252.82, "last" : 9252.82, "buy" : 9252.82, "sell" : 9252.82, "symbol" : "€"},
"GBP" : {"15m" : 8472.15, "last" : 8472.15, "buy" : 8472.15, "sell" : 8472.15, "symbol" : "£"},
"HKD" : {"15m" : 84913.79, "last" : 84913.79, "buy" : 84913.79, "sell" : 84913.79, "symbol" : "$"},
"INR" : {"15m" : 805690.37, "last" : 805690.37, "buy" : 805690.37, "sell" : 805690.37, "symbol" : "₹"},
"ISK" : {"15m" : 1490967.05, "last" : 1490967.05, "buy" : 1490967.05, "sell" : 1490967.05, "symbol" : "kr"},
"JPY" : {"15m" : 1145199.68, "last" : 1145199.68, "buy" : 1145199.68, "sell" : 1145199.68, "symbol" : "¥"},
"KRW" : {"15m" : 1.276426884E7, "last" : 1.276426884E7, "buy" : 1.276426884E7, "sell" : 1.276426884E7, "symbol" : "₩"},
"NZD" : {"15m" : 16212.46, "last" : 16212.46, "buy" : 16212.46, "sell" : 16212.46, "symbol" : "$"},
"PLN" : {"15m" : 41210.73, "last" : 41210.73, "buy" : 41210.73, "sell" : 41210.73, "symbol" : "zł"},
"RUB" : {"15m" : 828134.25, "last" : 828134.25, "buy" : 828134.25, "sell" : 828134.25, "symbol" : "RUB"},
"SEK" : {"15m" : 96075.78, "last" : 96075.78, "buy" : 96075.78, "sell" : 96075.78, "symbol" : "kr"},
"SGD" : {"15m" : 14887.32, "last" : 14887.32, "buy" : 14887.32, "sell" : 14887.32, "symbol" : "$"},
"THB" : {"15m" : 340419.95, "last" : 340419.95, "buy" : 340419.95, "sell" : 340419.95, "symbol" : "฿"},
"TRY" : {"15m" : 82859.99, "last" : 82859.99, "buy" : 82859.99, "sell" : 82859.99, "symbol" : "₺"},
"TWD" : {"15m" : 317959.03, "last" : 317959.03, "buy" : 317959.03, "sell" : 317959.03, "symbol" : "NT$"}
}
class AllCurrencies {
Currency uSD;
Currency aUD;
Currency bRL;
Currency cAD;
Currency cHF;
Currency cLP;
Currency cNY;
Currency dKK;
Currency eUR;
Currency gBP;
Currency hKD;
Currency iNR;
Currency iSK;
Currency jPY;
Currency kRW;
Currency nZD;
Currency pLN;
Currency rUB;
Currency sEK;
Currency sGD;
Currency tHB;
Currency tRY;
Currency tWD;
AllCurrencies(
{this.uSD,
this.aUD,
this.bRL,
this.cAD,
this.cHF,
this.cLP,
this.cNY,
this.dKK,
this.eUR,
this.gBP,
this.hKD,
this.iNR,
this.iSK,
this.jPY,
this.kRW,
this.nZD,
this.pLN,
this.rUB,
this.sEK,
this.sGD,
this.tHB,
this.tRY,
this.tWD});
AllCurrencies.fromJson(Map<String, dynamic> json) {
uSD = json['USD'] != null ? new Currency.fromJson(json['USD']) : null;
aUD = json['AUD'] != null ? new Currency.fromJson(json['AUD']) : null;
bRL = json['BRL'] != null ? new Currency.fromJson(json['BRL']) : null;
cAD = json['CAD'] != null ? new Currency.fromJson(json['CAD']) : null;
cHF = json['CHF'] != null ? new Currency.fromJson(json['CHF']) : null;
cLP = json['CLP'] != null ? new Currency.fromJson(json['CLP']) : null;
cNY = json['CNY'] != null ? new Currency.fromJson(json['CNY']) : null;
dKK = json['DKK'] != null ? new Currency.fromJson(json['DKK']) : null;
eUR = json['EUR'] != null ? new Currency.fromJson(json['EUR']) : null;
gBP = json['GBP'] != null ? new Currency.fromJson(json['GBP']) : null;
hKD = json['HKD'] != null ? new Currency.fromJson(json['HKD']) : null;
iNR = json['INR'] != null ? new Currency.fromJson(json['INR']) : null;
iSK = json['ISK'] != null ? new Currency.fromJson(json['ISK']) : null;
jPY = json['JPY'] != null ? new Currency.fromJson(json['JPY']) : null;
kRW = json['KRW'] != null ? new Currency.fromJson(json['KRW']) : null;
nZD = json['NZD'] != null ? new Currency.fromJson(json['NZD']) : null;
pLN = json['PLN'] != null ? new Currency.fromJson(json['PLN']) : null;
rUB = json['RUB'] != null ? new Currency.fromJson(json['RUB']) : null;
sEK = json['SEK'] != null ? new Currency.fromJson(json['SEK']) : null;
sGD = json['SGD'] != null ? new Currency.fromJson(json['SGD']) : null;
tHB = json['THB'] != null ? new Currency.fromJson(json['THB']) : null;
tRY = json['TRY'] != null ? new Currency.fromJson(json['TRY']) : null;
tWD = json['TWD'] != null ? new Currency.fromJson(json['TWD']) : null;
}
Map<String, dynamic> toJson() {
final Map<String, dynamic> data = new Map<String, dynamic>();
if (this.uSD != null) {
data['USD'] = this.uSD.toJson();
}
if (this.aUD != null) {
data['AUD'] = this.aUD.toJson();
}
if (this.bRL != null) {
data['BRL'] = this.bRL.toJson();
}
if (this.cAD != null) {
data['CAD'] = this.cAD.toJson();
}
if (this.cHF != null) {
data['CHF'] = this.cHF.toJson();
}
if (this.cLP != null) {
data['CLP'] = this.cLP.toJson();
}
if (this.cNY != null) {
data['CNY'] = this.cNY.toJson();
}
if (this.dKK != null) {
data['DKK'] = this.dKK.toJson();
}
if (this.eUR != null) {
data['EUR'] = this.eUR.toJson();
}
if (this.gBP != null) {
data['GBP'] = this.gBP.toJson();
}
if (this.hKD != null) {
data['HKD'] = this.hKD.toJson();
}
if (this.iNR != null) {
data['INR'] = this.iNR.toJson();
}
if (this.iSK != null) {
data['ISK'] = this.iSK.toJson();
}
if (this.jPY != null) {
data['JPY'] = this.jPY.toJson();
}
if (this.kRW != null) {
data['KRW'] = this.kRW.toJson();
}
if (this.nZD != null) {
data['NZD'] = this.nZD.toJson();
}
if (this.pLN != null) {
data['PLN'] = this.pLN.toJson();
}
if (this.rUB != null) {
data['RUB'] = this.rUB.toJson();
}
if (this.sEK != null) {
data['SEK'] = this.sEK.toJson();
}
if (this.sGD != null) {
data['SGD'] = this.sGD.toJson();
}
if (this.tHB != null) {
data['THB'] = this.tHB.toJson();
}
if (this.tRY != null) {
data['TRY'] = this.tRY.toJson();
}
if (this.tWD != null) {
data['TWD'] = this.tWD.toJson();
}
return data;
}
}
class Currency {
double d15m;
double last;
double buy;
double sell;
String symbol;
Currency({this.d15m, this.last, this.buy, this.sell, this.symbol});
Currency.fromJson(Map<String, dynamic> json) {
d15m = json['15m'];
last = json['last'];
buy = json['buy'];
sell = json['sell'];
symbol = json['symbol'];
}
Map<String, dynamic> toJson() {
final Map<String, dynamic> data = new Map<String, dynamic>();
data['15m'] = this.d15m;
data['last'] = this.last;
data['buy'] = this.buy;
data['sell'] = this.sell;
data['symbol'] = this.symbol;
return data;
}
}
关于json - 如何在Dart中为 map ，多层 map 创建模型，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/63983244/