added 404 response if a post is not found

src/main.rs

@@ -17,6 +17,7 @@ use self::diesel::prelude::*;
 use self::models::*;
 use comrak::{markdown_to_html, ComrakOptions};
 use diesel::pg::PgConnection;
+use diesel::result::Error;
 use dotenv::dotenv;
 use rand::Rng;
 use rocket::Request;
@@ -87,13 +88,13 @@ fn index(page: Option<i8>) -> Template {
     Template::render("index", context)
 }
 
-fn get_post(id_number: i32) -> Post {
+fn get_post(id_number: i32) -> Result<Post, Error> {
     use schema::posts::dsl::*;
 
     let connection = establish_connection();
     let post = posts.find(id_number).first(&connection);
 
-    post.unwrap()
+    post
 }
 
 #[get("/post/<title>")]
@@ -107,13 +108,24 @@ fn show_post(title: String) -> Template {
     let title_fmt = TITLES[rng.gen_range(0, TITLES.len())];
     let title = str::replace(title_fmt, "{}", "CódigoComentado");
 
-    let mut post = get_post(id);
-    let content = markdown_to_html(&post.content, &ComrakOptions::default());
-    post.content = content;
+    let post = get_post(id);
 
     context.insert("title", &title);
-    context.insert("post", &post);
+
+    match post {
+        Ok(mut p) => {
+            let content = markdown_to_html(&p.content, &ComrakOptions::default());
+            p.content = content;
+
+            context.insert("post", &p);
             Template::render("post", context)
+        }
+        Err(_e) => {
+            let uri = format!("/post/{}", title_splited.join("-"));
+            context.insert("url", &uri);
+            Template::render("404", context)
+        }
+    }
 }
 
 #[catch(404)]