Improve example

examples/minimal/src/main.rs

@@ -3,13 +3,14 @@
 #[macro_use] extern crate rocket;
 #[macro_use] extern crate serde_derive;
 
-use rocket::response::Redirect;
-use rocket::request::Form;
+use rocket::response::{Flash, Redirect};
+use rocket::request::{FlashMessage, Form};
 use rocket_contrib::templates::Template;
 
 #[derive(Serialize)]
 struct TemplateContext {
     csrf_token: String,
+    flash: Option<String>,
 }
 
 #[derive(FromForm)]
@@ -22,24 +23,36 @@ fn main() {
     rocket::ignite()
         .attach(rocket_csrf::Fairing::new())
         .attach(Template::fairing())
-        .mount("/", routes![new, create])
+        .mount("/", routes![index, new, create])
         .launch();
 }
 
+#[get("/")]
+fn index() -> Redirect {
+    Redirect::to(uri!(new))
+}
+
 #[get("/comments/new")]
-fn new(csrf: rocket_csrf::Guard) -> Template {
+fn new(csrf: rocket_csrf::Guard, flash: Option<FlashMessage>) -> Template {
     let template_context = TemplateContext {
         csrf_token: csrf.0,
+        flash: flash.map(|msg| format!("{}! {}", msg.name(), msg.msg())),
     };
 
     Template::render("comments/new", &template_context)
 }
 
 #[post("/comments", data = "<form>")]
-fn create(csrf: rocket_csrf::Guard, form: Form<Comment>) -> Redirect {
+fn create(csrf: rocket_csrf::Guard, form: Form<Comment>) -> Flash<Redirect> {
     if let Err(_) = csrf.verify(&form.authenticity_token) {
-        return Redirect::to(uri!(new));
+        return Flash::error(
+            Redirect::to(uri!(new)),
+            "invalid authenticity token",
+        );
     }
 
-    Redirect::to(uri!(new))
+    Flash::success(
+        Redirect::to(uri!(new)),
+        format!("created comment: {:#?}", form.text),
+    )
 }

examples/minimal/templates/comments/new.html.hbs

@@ -1,3 +1,5 @@
+{{ flash }}
+
 <form method="post" action="/comments">
   <input type="hidden" name="authenticity_token" value="{{ csrf_token }}"/>
   <input type="text" name="text"/>