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How can I support an unknown or other value for a Serde enum?（5个答案）
上个月关门了。
我正在尝试对json进行编译，但无法得到预期的结果。下面是我的代码：

use serde::{Serialize, Deserialize};

#[derive(Debug, Clone, Serialize, Deserialize)]
struct StudentData{
    stu1: TestResult,
    stu2: TestResult,
    stu3: TestResult,
}

#[derive(Debug, Clone, Serialize, Deserialize)]
#[serde(untagged)]
enum TestResult{
    #[serde(rename = "fail")]
    Fail,
    #[serde(rename = "absent")]
    Absent,
    Pass(String)
}

fn main() {
    let json_string = "{\"stu1\":\"50\",\"stu2\":\"fail\",\"stu3\":\"absent\"}";
    let s: StudentData = serde_json::from_str(json_string).expect("should provide student data");
    println!("{:#?}", s);
}

字符串
输出

StudentData {
    stu1: Pass(
        "50",
    ),
    stu2: Pass(
        "fail",
    ),
    stu3: Pass(
        "absent",
    ),
}

型
我想得到的是：

StudentData {
    stu1: Pass(
        "50",
    ),
    stu2: Fail,
    stu3: Absent,
}

型
这可行吗？