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1911860538 发表于 2024-02-20 14:22

Tags:serde,serde_json

代码如下

use serde::{Deserialize, Serialize};

#[derive(Serialize, Deserialize)]
struct Person {
    id: String,
    name: String,
}

#[derive(Serialize, Deserialize)]
struct Msg<'a> {
    id: String,
    person: &'a Person,
}

fn main() {
    let person = Person {
        id: "123".to_string(),
        name: "Alice".to_string(),
    };

    let msg = Msg {
        id: "456".to_string(),
        person: &person,
    };

    let msg_str = serde_json::to_string(&msg).unwrap();
    println!("Serialized Msg: {}", msg_str);
}

报错如下

error[E0277]: the trait bound `&'a Person: Deserialize<'_>` is not satisfied
    --> src/main.rs:2463:13
     |
2463 |     person: &'a Person,
     |             ^^^^^^^^^^ the trait `Deserialize<'_>` is not implemented for `&'a Person`
     |
note: required by a bound in `next_element`
    --> /home/alxps/.cargo/registry/src/index.crates.io-6f17d22bba15001f/serde-1.0.195/src/de/mod.rs:1726:12
     |
1724 |     fn next_element<T>(&mut self) -> Result<Option<T>, Self::Error>
     |        ------------ required by a bound in this associated function
1725 |     where
1726 |         T: Deserialize<'de>,
     |            ^^^^^^^^^^^^^^^^ required by this bound in `SeqAccess::next_element`
help: consider removing the leading `&`-reference
     |
2463 -     person: &'a Person,
2463 +     person: Person,
     |

我不想让msg有person所有权,也不想clone person,现在要自定义序列化实现trait,要怎么写?或者有没有其他方法

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Louys·Miaoa 豆沙饼 2024-02-23 11:54

今天又进度, 原来Cow这么用的

作者 1911860538 2024-02-20 15:34

谢谢

--
👇
aj3n: 序列化本来就没有问题,你手欠给Msg加了derive(Deserialize)才报错了,删掉就好了;

如果一定需要Deserialize, person字段类型改成Cow<'a, Person>之类的就好了;

aj3n 2024-02-20 14:37

序列化本来就没有问题,你手欠给Msg加了derive(Deserialize)才报错了,删掉就好了;

如果一定需要Deserialize, person字段类型改成Cow<'a, Person>之类的就好了;

廴壬吉 2024-02-20 14:31

不能用引用

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