hardcoded toast

src/controllers/cart.rs

@@ -1,5 +1,8 @@
 use crate::{controllers::i18n::current_lang, shared::money::format_price, models::products};
-use axum::{http::HeaderMap, response::Redirect};
+use axum::{
+    http::{HeaderMap, StatusCode},
+    response::Redirect,
+};
 use axum_extra::extract::cookie::{Cookie, CookieJar, SameSite};
 use loco_rs::prelude::*;
 use sea_orm::{ColumnTrait, EntityTrait, QueryFilter};
@@ -73,6 +76,7 @@ async fn published_product(ctx: &AppContext, id: i32) -> Result<Option<products:
 async fn add(
     jar: CookieJar,
     State(ctx): State<AppContext>,
+    headers: HeaderMap,
     Form(form): Form<AddForm>,
 ) -> Result<Response> {
     let Some(product) = published_product(&ctx, form.product_id).await? else {
@@ -88,9 +92,21 @@ async fn add(
     }
     items.retain(|(_, qty)| *qty > 0);
 
-    format::render()
-        .cookies(&[cart_cookie(serialize_cart(&items))])?
-        .redirect("/cart")
+    let jar = jar.add(cart_cookie(serialize_cart(&items)));
+
+    // Adding to the cart should never navigate away: htmx requests get an empty
+    // 204 (the header cart badge updates client-side), and a no-JS submit goes
+    // back to the page the customer was on rather than to the basket.
+    if headers.contains_key("HX-Request") {
+        Ok((jar, StatusCode::NO_CONTENT).into_response())
+    } else {
+        let back = headers
+            .get("referer")
+            .and_then(|v| v.to_str().ok())
+            .unwrap_or("/shop")
+            .to_string();
+        Ok((jar, Redirect::to(&back)).into_response())
+    }
 }
 
 #[debug_handler]