diesel installed with example to create and list users

src/bin/create_user.rs

@@ -0,0 +1,39 @@
+use diesel::pg::PgConnection;
+use diesel::prelude::*;
+use dotenvy::dotenv;
+use miniweb::users::models::{NewUser, User};
+use std::env;
+use std::io::stdin;
+
+pub fn establish_connection() -> PgConnection {
+    dotenv().ok();
+
+    let database_url = env::var("DATABASE_URL").expect("DATABASE_URL must be set");
+    PgConnection::establish(&database_url)
+        .unwrap_or_else(|_| panic!("Error connecting to {}", database_url))
+}
+
+pub fn create_user(conn: &mut PgConnection, username: &str) -> User {
+    use miniweb::schema::users;
+
+    let new_user = NewUser { username };
+
+    diesel::insert_into(users::table)
+        .values(&new_user)
+        .returning(User::as_returning())
+        .get_result(conn)
+        .expect("Error saving new user")
+}
+
+fn main() {
+    let connection = &mut establish_connection();
+
+    let mut username = String::new();
+
+    println!("Enter username for new user:");
+    stdin().read_line(&mut username).unwrap();
+    let username = username.trim_end(); // Remove the trailing newline
+
+    let user = create_user(connection, username);
+    println!("\nSaved user {} with id {}", username, user.id);
+}

src/bin/list_users.rs

@@ -0,0 +1,29 @@
+use diesel::pg::PgConnection;
+use diesel::prelude::*;
+use dotenvy::dotenv;
+use miniweb::schema::users::dsl::*;
+use miniweb::users::models::User;
+use std::env;
+
+pub fn establish_connection() -> PgConnection {
+    dotenv().ok();
+
+    let database_url = env::var("DATABASE_URL").expect("DATABASE_URL must be set");
+    PgConnection::establish(&database_url)
+        .unwrap_or_else(|_| panic!("Error connecting to {}", database_url))
+}
+
+fn main() {
+    let connection = &mut establish_connection();
+
+    let results = users
+        .select(User::as_select())
+        .load(connection)
+        .expect("Error loading posts");
+
+    println!("Displaying {} users", results.len());
+    for user in results {
+        println!("{}", user.username);
+    }
+    println!("-----------\n");
+}

src/lib.rs

@@ -1,2 +1,4 @@
+pub mod schema;
 pub mod service;
 pub mod state;
+pub mod users;

src/schema.rs

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+// @generated automatically by Diesel CLI.
+
+diesel::table! {
+    users (id) {
+        id -> Int4,
+        username -> Varchar,
+    }
+}

src/users/mod.rs

@@ -0,0 +1 @@
+pub mod models;

src/users/models.rs

@@ -0,0 +1,15 @@
+use diesel::prelude::*;
+
+#[derive(Queryable, Selectable)]
+#[diesel(table_name = crate::schema::users)]
+#[diesel(check_for_backend(diesel::pg::Pg))]
+pub struct User {
+    pub id: i32,
+    pub username: String,
+}
+
+#[derive(Insertable)]
+#[diesel(table_name = crate::schema::users)]
+pub struct NewUser<'a> {
+    pub username: &'a str,
+}