锈质不满意

如何解决锈质不满意

我不熟悉锈，尝试在stackoverflow中进行搜索以及阅读Serde文档 https://docs.serde.rs/serde/trait.Serialize.html和https://serde.rs/impl-serialize.html，但我有点迷茫。

我想使用Tera生成html，而我传递给它的结构没有实现特征serde::ser::Serialize，并且我尝试实现它，但是看起来不太正确。

Cargo.toml依赖项

serde = "1.0.115"
serde_derive = "1.0.115"
serde-xml-rs = "0.4.0"
tera = "0.7.2"

main.rs

extern crate tera;
#[macro_use]
extern crate serde_derive;
extern crate serde;

use tera::Context;
use serde::ser::{Serialize,SerializeStruct,Serializer};

#[derive(Serialize,Debug)]
struct Person {
    firstname: String,lastname: String,age: i32,}

#[derive(Debug)]
struct Attendees {
    people: Vec<Person>,updatedOn: String,updatedBy: String,}

impl Serialize for Attendees {
    fn serialize<S>(&self,serializer: S) -> Result<S::Ok,S::Error>
    where
        S: Serializer,{
        let mut s = serializer.serialize_struct("Person",3)?;
        s.serialize_field("people",&self.people)?;
        s.serialize_field("updatedOn",&self.updatedOn)?;
        s.serialize_field("updatedBy",&self.updatedBy)?;
        s.end()
    }
}

fn main() {
   let mut context = Context::new();
   let mut peeps: Vec<Person> = Vec::new();
   let mut attendees = Attendees {
      people: peeps,updatedOn: String::from("today"),updatedBy: String::from("someone"),};
   context.add("attendees",&attendees);
}

编译器说：

mytest % cargo run      
   Compiling mytest v0.1.0 (/home/mike/mytest)
error[E0277]: the trait bound `Attendees: serde::ser::Serialize` is not satisfied
  --> src/main.rs:44:29
   |
44 |    context.add("attendees",&attendees);
   |                             ^^^^^^^^^^ the trait `serde::ser::Serialize` is not implemented for `Attendees`

error: aborting due to previous error

我显然缺少了一些东西……有人可以帮忙吗？

解决方法

您实现的特征和错误所引用的特征不同，因为它们所引用的是Serde的两个不同版本。

[[package]]
name = "tera"
version = "0.7.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "c37e2aaa53871f9c3722a20f8951fea0afd366955e11542a58feb71997c6d769"
dependencies = [
 "chrono","error-chain","glob","humansize","lazy_static 0.2.11","pest","regex","serde 0.9.15","serde_json","slug","url",]

Tera 0.7.2未使用Serde的版本1.0.*，而是0.9.*。

您可以使用更新的Tera，或在Cargo.toml中使用兼容的Serde版本：

[dependencies]
serde = "0.9.15"
serde_derive = "0.9.15"