本文介绍了如何解决"serde :: Deserialize的实现不够通用"?使用actix-web的Json类型?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我正在使用actix-web编写服务器:
I'm writing a server using actix-web:
use actix_web::{post, web, Responder};
use serde::Deserialize;
#[derive(Deserialize)]
struct UserModel<'a, 'b> {
username: &'a str,
password: &'b str,
}
#[post("/")]
pub fn register(user_model: web::Json<UserModel>) -> impl Responder {}
编译器给出此错误:
error: implementation of `user::_IMPL_DESERIALIZE_FOR_UserModel::_serde::Deserialize` is not general enough
--> src/user.rs:31:1
|
31 | #[post("/")]
| ^^^^^^^^^^^^
|
= note: `user::UserModel<'_, '_>` must implement `user::_IMPL_DESERIALIZE_FOR_UserModel::_serde::Deserialize<'0>`, for any lifetime `'0`
= note: but `user::UserModel<'_, '_>` actually implements `user::_IMPL_DESERIALIZE_FOR_UserModel::_serde::Deserialize<'1>`, for some specific lifetime `'1`
我应该如何解决?
推荐答案
来自 actix-web
文档:
impl<T> FromRequest for Json<T>
where
T: DeserializeOwned + 'static,
它基本上说,如果希望actix-web
从请求中提取类型,则只能使用拥有Json
类型的拥有的数据,而不能借用数据.因此,您必须在此处使用String
:
It basically says you can only use owned, not borrowed, data with the Json
type if you want actix-web
to extract types from the request for you. Thus you have to use String
here:
use actix_web::{post, web, Responder};
use serde::Deserialize;
#[derive(Deserialize)]
struct UserModel {
username: String,
password: String,
}
#[post("/")]
pub fn register(user_model: web::Json<UserModel>) -> impl Responder {
unimplemented!()
}
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