json - 使用 serde_json 解析对象内部的对象

Question

我卡住了，下面是我收到的 JSON:

{
   "BCH": {
      "aclass": "currency",
      "altname": "BCH",
      "decimals": 10,
      "display_decimals": 5
   }
}

我对我的结构应该如何使用 serde_json crate 解析属性感到困惑。以下是我目前拥有的:

#[derive(Deserialize, Debug)]
struct Assets  {  
    aclass: String,
    altname: String,
    decimals: u8,
    display_decimals: u8,
}

#[derive(Deserialize, Debug)]
struct Currency {
    assest: Assets,
}


fn to_assets_type(value: serde_json::Value) -> Currency {
 serde_json::from_value(value).unwrap()
}

我收到一条错误消息:

thread 'main' panicked at 'called Result::unwrap() on an Err value: ErrorImpl { code: Message("missing field assest"), line: 0, column: 0 }', src/libcore/result.rs:860:4

Answer 1

我想你想要一个 HashMap。

#[macro_use] extern crate serde;
extern crate serde_json;

use std::collections::HashMap;

static VALUE: &str = r#"{
   "BCH": {
      "aclass": "currency",
      "altname": "BCH",
      "decimals": 10,
      "display_decimals": 5
   }
}"#;

#[derive(Deserialize, Debug)]
struct Assets {  
    aclass: String,
    altname: String,
    decimals: u8,
    display_decimals: u8,
}

fn main() {
    let serde_value: HashMap<String, Assets> = serde_json::from_str(VALUE).unwrap();

    println!("{:?}", serde_value);
}

playground