Refactored the whole code to a better structure

project/src/handlers/authentication.rs

@@ -0,0 +1 @@
+pub fn login() {}

project/src/handlers/mod.rs

@@ -0,0 +1,10 @@
+pub mod authentication;
+pub mod register;
+
+use crate::db_connection::{DbPool, MyPooledConnection};
+use actix_web::{web, HttpResponse};
+
+pub fn pool_handler(pool: web::Data<DbPool>) -> Result<MyPooledConnection, HttpResponse> {
+    pool.get()
+        .map_err(|e| HttpResponse::InternalServerError().json(e.to_string()))
+}

project/src/handlers/register.rs

@@ -0,0 +1,19 @@
+use crate::db_connection::DbPool;
+use crate::handlers::pool_handler;
+use crate::models::user::{RegisterUser, User};
+use actix_web::{web, HttpResponse};
+
+pub fn register(
+    new_user: web::Json<RegisterUser>,
+    pool: web::Data<DbPool>,
+) -> Result<HttpResponse, HttpResponse> {
+    let my_pool = pool_handler(pool)?;
+    let register_user = new_user
+        .into_inner()
+        .validation()
+        .map_err(|e| HttpResponse::InternalServerError().json(e.to_string()))?;
+
+    User::create(register_user, &my_pool)
+        .map(|user| HttpResponse::Ok().json(user))
+        .map_err(|e| HttpResponse::InternalServerError().json(e.to_string()))
+}