<'_> 未实现 `Serialize` 特征

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"}]
    })
}

导致 error[E0277]: the trait bound IndexContext<'_>: Serialize is not satisfied。错误发生在呈现模板时将 IndexLink 的 vec 添加到 IndexContent 的行。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

相关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
}

<'_> 未实现 `Serialize` 特征

the trait `Serialize` is not implemented for <'_>

rust

serde

rust-rocket