在当前范围内未找到针对struct`schema :: todos :: table`的名为table的函数或相关项

如何解决在当前范围内未找到针对struct`schema :: todos :: table`的名为table的函数或相关项

我想创建一个函数，该函数使用Diesel读取postgresql中的所有数据，并将其作为Vec返回。

错误消息

我相信此错误消息表明todos未实现table函数。我认为这不是问题，因为模型中有#[derive(Queryable)]。

error[E0599]: no function or associated item named `table` found for struct `schema::todos::table` in the current scope
 --> src/actions.rs:9:42
  |
9 |       let entries: Vec<TodoEntry> = todos::table.load::<TodoEntry>(&connection).expect("Error loading todos");
  |                                            ^^^^^ function or associated item not found in `schema::todos::table`
  | 
 ::: src/schema.rs:1:1
  |
1 | / table! {
2 | |     todos (id) {
3 | |         id -> Int4,4 | |         body -> Text,5 | |     }
6 | | }
  | |_- function or associated item `table` not found for this
  |
  = help: items from traits can only be used if the trait is in scope
  = note: the following trait is implemented but not in scope; perhaps add a `use` for it:
          `use crate::diesel::associations::HasTable;`

相关代码

Cargo.toml

[package]
authors = ["hogehogehoge"]
edition = "2018"
name = "todo"
version = "0.1.0"
[dependencies]
actix-web = "3"
askama = "*"
thiserror = "*"
diesel = { version = "1.4.4",features = ["postgres","r2d2"] }
r2d2 = "0.8"
dotenv = "0.15.0"

diesel.toml

[print_schema]
file = "src/schema.rs"

actions.rs

此文件具有一个函数，该函数以Vec的形式返回在数据库中注册的数据。

use diesel::pg::PgConnection;

use crate::models;
use crate::templates::TodoEntry;

pub fn return_all(connection: &PgConnection) -> Result<Vec<TodoEntry>,diesel::result::Error> {
    use crate::schema::todos::dsl::*;

    let entries: Vec<TodoEntry> = todos::table.load::<TodoEntry>(&connection).expect("Error loading todos");
    Ok(entries)
}

templates.rs

此文件确定要在数据库中注册的数据类型，然后添加

#[derive(Queryable)]
pub struct Todo {
    pub id: u32,pub text: String,}

schema.rs

table! {
    todos (id) {
        id -> Int4,body -> Text,}
}

解决方法

我认为您已经混合使用两种不同的方式来引用特定的表。根据{{​​3}}，它是crate::schema::table_name::table或crate::schema::table_name::dsl::table_name。您尝试使用crate::schema::table_name::dsl::table_name::table。