我一包含文件,Diesel 和 Rocket 的导入就会中断
Diesel and Rocket imports break as soon as I include a file
我有文件“user.rs”,它具有 postgres 数据库的结构 table。每当我尝试将它包含在我的 main.rs 文件(一个 Rocket 网络项目)中时,所有 Diesel“东西”都无法解析。这是我的 user.js 文件:
use super::schema::users;
pub mod handler;
pub mod repository;
pub mod router;
#[derive(Queryable, AsChangeset, Serialize, Deserialize)]
#[table_name = "users"]
pub struct User {
pub id: String,
pub username: String,
pub password: String,
}
#[derive(Insertable)]
#[table_name = "users"]
pub struct InsertableUser {
username: String,
password: String,
}
pub impl InsertableUser {
pub fn from_user(user: User) -> InsertableUser {
InsertableUser {
username: user.username,
password: user.password,
}
}
}
pub fn all(connection: &PgConnection) -> QueryResult<Vec<User>> {
users::table.load::<User>(&*connection)
}
pub fn get(id: i32, connection: &PgConnection) -> QueryResult<User> {
users::table.find(id).get_result::<User>(connection)
}
pub fn insert(user: User, connection: &PgConnection) -> QueryResult<User> {
diesel::insert_into(users::table)
.values(&InsertableUser::from_user(user))
.get_result(connection)
}
pub fn update(id: i32, user: User, connection: &PgConnection) -> QueryResult<User> {
diesel::update(users::table.find(id))
.set(&user)
.get_result(connection)
}
pub fn delete(id: i32, connection: &PgConnection) -> QueryResult<usize> {
diesel::delete(users::table.find(id)).execute(connection)
}
这是我的 main.rs:
#![feature(proc_macro_hygiene, decl_macro)]
#[macro_use]
extern crate rocket;
#[macro_use]
extern crate rocket_contrib;
use rocket_contrib::databases::diesel;
#[database("camera-server-db")]
struct CameraServerDbConn(diesel::PgConnection);
mod user;
#[get("/")]
fn index() -> &'static str {
"Hello World!"
}
fn main() {
rocket::ignite()
.attach(CameraServerDbConn::fairing())
.mount("/", routes![index])
.launch();
}
如果我从 main.rs 中删除 mod user;
,则不会出现错误。当我 运行 cargo check
时,我得到很多“在此范围内找不到 x”。这是一个例子:
error: cannot find derive macro `AsChangeset` in this scope
--> src/user.rs:7:21
|
7 | #[derive(Queryable, AsChangeset, Serialize, Deserialize)]
| ^^^^^^^^^^^
我正在尝试遵循 this guide(诚然这已经过时了,但它是我能找到的仅有的实际指南之一)。
如“最后一步”部分的链接指南中所述,您需要正确导入柴油,否则编译器无法解析这些 traits/derives/functions。这意味着您需要按如下方式更改 main.rs
文件:
#![feature(proc_macro_hygiene, decl_macro)]
#[macro_use]
extern crate rocket;
#[macro_use]
extern crate rocket_contrib;
#[macro_use]
extern crate diesel;
use rocket_contrib::databases::diesel;
#[database("camera-server-db")]
struct CameraServerDbConn(diesel::PgConnection);
mod user;
#[get("/")]
fn index() -> &'static str {
"Hello World!"
}
fn main() {
rocket::ignite()
.attach(CameraServerDbConn::fairing())
.mount("/", routes![index])
.launch();
}
(请注意您的 extern crate 部分中的附加 #[macro_use] extern crate diesel;
。)
我有文件“user.rs”,它具有 postgres 数据库的结构 table。每当我尝试将它包含在我的 main.rs 文件(一个 Rocket 网络项目)中时,所有 Diesel“东西”都无法解析。这是我的 user.js 文件:
use super::schema::users;
pub mod handler;
pub mod repository;
pub mod router;
#[derive(Queryable, AsChangeset, Serialize, Deserialize)]
#[table_name = "users"]
pub struct User {
pub id: String,
pub username: String,
pub password: String,
}
#[derive(Insertable)]
#[table_name = "users"]
pub struct InsertableUser {
username: String,
password: String,
}
pub impl InsertableUser {
pub fn from_user(user: User) -> InsertableUser {
InsertableUser {
username: user.username,
password: user.password,
}
}
}
pub fn all(connection: &PgConnection) -> QueryResult<Vec<User>> {
users::table.load::<User>(&*connection)
}
pub fn get(id: i32, connection: &PgConnection) -> QueryResult<User> {
users::table.find(id).get_result::<User>(connection)
}
pub fn insert(user: User, connection: &PgConnection) -> QueryResult<User> {
diesel::insert_into(users::table)
.values(&InsertableUser::from_user(user))
.get_result(connection)
}
pub fn update(id: i32, user: User, connection: &PgConnection) -> QueryResult<User> {
diesel::update(users::table.find(id))
.set(&user)
.get_result(connection)
}
pub fn delete(id: i32, connection: &PgConnection) -> QueryResult<usize> {
diesel::delete(users::table.find(id)).execute(connection)
}
这是我的 main.rs:
#![feature(proc_macro_hygiene, decl_macro)]
#[macro_use]
extern crate rocket;
#[macro_use]
extern crate rocket_contrib;
use rocket_contrib::databases::diesel;
#[database("camera-server-db")]
struct CameraServerDbConn(diesel::PgConnection);
mod user;
#[get("/")]
fn index() -> &'static str {
"Hello World!"
}
fn main() {
rocket::ignite()
.attach(CameraServerDbConn::fairing())
.mount("/", routes![index])
.launch();
}
如果我从 main.rs 中删除 mod user;
,则不会出现错误。当我 运行 cargo check
时,我得到很多“在此范围内找不到 x”。这是一个例子:
error: cannot find derive macro `AsChangeset` in this scope
--> src/user.rs:7:21
|
7 | #[derive(Queryable, AsChangeset, Serialize, Deserialize)]
| ^^^^^^^^^^^
我正在尝试遵循 this guide(诚然这已经过时了,但它是我能找到的仅有的实际指南之一)。
如“最后一步”部分的链接指南中所述,您需要正确导入柴油,否则编译器无法解析这些 traits/derives/functions。这意味着您需要按如下方式更改 main.rs
文件:
#![feature(proc_macro_hygiene, decl_macro)]
#[macro_use]
extern crate rocket;
#[macro_use]
extern crate rocket_contrib;
#[macro_use]
extern crate diesel;
use rocket_contrib::databases::diesel;
#[database("camera-server-db")]
struct CameraServerDbConn(diesel::PgConnection);
mod user;
#[get("/")]
fn index() -> &'static str {
"Hello World!"
}
fn main() {
rocket::ignite()
.attach(CameraServerDbConn::fairing())
.mount("/", routes![index])
.launch();
}
(请注意您的 extern crate 部分中的附加 #[macro_use] extern crate diesel;
。)