rust - <'_> 未实现特征 `Serialize`

Question

#[derive(serde::Serialize)]
struct IndexLink<'r>{
    text: &'r str,
    link: &'r str;
}

#[derive(serde::Serialize)]
struct IndexContext<'r> {
    title: &'r str,
    links: Vec<&'r IndexLink<&'r>>
}

#[get("/")]
pub fn index() -> Template {
    Template::render("index", &IndexContext{
        title : "My home on the web",
        links: vec![IndexLink{text: "About", link: "/about"}, IndexLink{text: "RSS Feed", link: "/feed"}]
    })
}

原因 error[E0277]: the trait bound IndexContext<'_>: Serialize is not satisfied .错误发生在添加 vec 的行中的 IndexLink到 IndexContent渲染模板时。我一定是在生命周期上做错了什么。

为什么会出现这个错误？

Answer 1

有问题的代码有多个语法错误。定义这些类型的有效方法如下:

#[derive(serde::Serialize)]
struct IndexLink<'r>{
    text: &'r str,
    link: &'r str, // no semicolon inside struct definition
}

#[derive(serde::Serialize)]
struct IndexContext<'r> {
    title: &'r str,
    links: Vec<&'r IndexLink<'r>>, // lifetime parameter is just 'r, not &'r
}