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所以我试图按照https://medium.com/sean3z/building-a-restful-crud-api-with-rust-1867308352d8中的示例构建一个简单的 REST API。中途,锈编译器给了我以下错误: unresolved imports 'rocket_contrib::Json', 'rocket_contrib::Value' no 'Json' in the root

我似乎无法弄清楚我做错了什么。

这是我的 Cargo.toml:

[package]
name = "rust-api-test"
version = "0.1.0"
authors = ["username"]
edition = "2018"

# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html

[dependencies]
rocket = "0.4.4"
serde = "1.0"
serde_json = "1.0"
serde_derive = "1.0"

[dependencies.rocket_contrib]
version = "0.4.4"
default-features = false
features = ["json"]

hero.rs:

#[derive(Serialize, Deserialize)]
pub struct Hero {
    pub id: Option<i32>,
    pub name: String,
    pub identity: String,
    pub hometown: String,
    pub age: i32
}

和 main.rs:

#![feature(proc_macro_hygiene, decl_macro)]

#[macro_use] extern crate rocket;
#[macro_use] extern crate rocket_contrib;
#[macro_use] extern crate serde_derive;

mod hero;
use hero::{Hero};

use rocket_contrib::{Json, Value};


#[get("/")]
fn index() -> &'static str {
    "Hello, world!"
}

fn main() {
    rocket::ignite().mount("/", routes![index]).launch();
}

我在第 10 行得到错误: use rocket_contrib::{Json, Value};



我听从了Sven Marnach 的 建议,现在它起作用了。我将 main.rs 文件更改为以下内容:

#![feature(proc_macro_hygiene, decl_macro)]

#[macro_use] extern crate rocket;
#[macro_use] extern crate rocket_contrib;
#[macro_use] extern crate serde_derive;

mod hero;
use hero::{Hero};

use rocket_contrib::json::{Json, JsonValue};


#[post("/", data = "<hero>")]
fn create(hero: Json<Hero>) -> Json<Hero> {
    hero
}

#[get("/")]
fn read() -> JsonValue {
    json!([
        "hero 1", 
        "hero 2"
    ])
}

#[put("/<id>", data = "<hero>")]
fn update(id: i32, hero: Json<Hero>) -> Json<Hero> {
    hero
}

#[delete("/<id>")]
fn delete(id: i32) -> JsonValue {
    json!({"status": "ok"})
}

#[get("/")]
fn index() -> &'static str {
    "Hello, world!"
}

fn main() {
    rocket::ignite()
        .mount("/", routes![index])
        .mount("/hero", routes![create, update, delete])
        .mount("/heroes", routes![read])
        .launch();
}
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1 回答 1

2

示例代码是为现已过时的 Rocket 0.3.x 版本编写的。您不能再基于旧版本启动新项目,因为某些依赖项已从 crates.io 中删除。然而,修复示例代码相对容易——编译器抱怨的导入无论如何都不会被使用,所以你可以简单地删除它。在 0.4.x 版本中rocket_contribrocket_contrib::Json结构已移至rocket_contrib::json::Json,因此如果需要,您也可以从新位置导入。rocket_contrib::Value枚举已被替换为,rocket_contrib::json::JsonValue尽管实现不同,因此您可能需要调整任何用途以适应新接口。

于 2020-04-09T07:59:43.623 回答