类型 'List<int>' 不是类型转换中 'String' 类型的子类型

Question

List<String> nameList,
List<int> priceList,
List<String> descriptionList,
List<int> priceTypeList,
List<double> netPriceList,
List<double> taxList,
List<double> nonTaxList,
List<String> codeList,
List<String> skuList

var mapping = Map<String, dynamic>();
mapping['variants_value[Variant][]'] = nameList == null
? ""
: List<String>.from(nameList.map((String x) => x));
mapping['name[]'] = nameList == null
? ""
: List<String>.from(nameList.map((String x) => x));
mapping['duplicate_name[]'] = nameList == null
? ""
: List<String>.from(nameList.map((String x) => x));
mapping['duplicate_ids[]'] = nameList == null
? ""
: List<String>.from(nameList.map((String x) => x));
mapping['price[]'] = priceList == null
? null
: List<int>.from(priceList.map((int x) => x));
mapping['code[]'] = descriptionList == null
? ""
: List<String>.from(descriptionList.map((String x) => x));
mapping['price_type[]'] = priceTypeList == null
? null
: List<int>.from(priceTypeList.map((int x) => x));
mapping['net_price[]'] = netPriceList == null
? null
: List<double>.from(netPriceList.map((double e) => e));
mapping['tax[]'] = taxList == null
? null
: List<double>.from(taxList.map((double e) => e));
mapping['non_tax[]'] = nonTaxList == null
? null
: List<double>.from(nonTaxList.map((double e) => e));
mapping['code_type[]'] = codeList == null
? ""
: List<String>.from(codeList.map((String x) => x));
mapping['sku[]'] = skuList == null
? ""
: List<String>.from(skuList.map((String x) => x));    
var url =
Uri.parse('https://xyz//m/api/product/add-product');

var response = await http.post(url,
headers: {
'Cookie': cookie,
},
body: mapping);
if (response.body != null && response.statusCode == 200) {
print(response.body);
return response.body.toString();
} else {
return null;
}

//这是我在postman

中传递的参数

variants_value[Variant][]: default
name[]: default
duplicate_name[]: default
duplicate_ids[]: 
price[]: 24
code[]: fgdg
price_type[]: 0
net_price[]: 24.00
tax[]: 0.00
non_tax[]: 0
code_type[]: Others
sku[]: 

我正在传递Listvalue与API，它给出的错误是

"type 'List<int>' is not a subtype of type 'String' in type cast"

后来，我通过API通过了List<int>value.toString();，我得到了这样的响应'Please enter value' Api is not accepting string，然后我意识到值应该是int

的类型我已经检查了api在邮差它的工作良好，当我通过整数值，如果做同样的扑动它的抛出错误

请告诉我如何将List传递给API

Answer 1

你必须这样通过:

"list": list== null ? null : List<int>.from(list.map((int x) => x)),

编辑1:我建议你在这种情况下或一般情况下使用。

Answer 2

try use

mapping['name'] = jsonEncode(nameList)

而不是

mapping['name'] = List<String>.from(nameList.map((String x) => x))

到你所有的数据

根据官方文件https://pub.dev/documentation/http/latest/http/post.html

body设置请求体。它可以是String, List或a Map<String,>如果它是一个String，它使用encoding进行编码并用作请求的主体。请求的内容类型默认为"text/plain"