Use HTML swap to display success and error messages

src/routes/admin/newsletters.rs

@@ -3,14 +3,15 @@ use crate::{
     idempotency::{IdempotencyKey, save_response, try_processing},
     routes::AdminError,
     startup::AppState,
+    templates::SuccessTemplate,
 };
 use anyhow::Context;
+use askama::Template;
 use axum::{
     Extension, Form,
     extract::State,
-    response::{IntoResponse, Redirect, Response},
+    response::{Html, IntoResponse, Response},
 };
-use axum_messages::Messages;
 use sqlx::{Executor, Postgres, Transaction};
 use uuid::Uuid;
 
@@ -67,20 +68,15 @@ async fn enqueue_delivery_tasks(
     Ok(())
 }
 
-#[tracing::instrument(
-    name = "Publishing a newsletter",
-    skip(connection_pool, form, messages)
-)]
+#[tracing::instrument(name = "Publishing a newsletter", skip(connection_pool, form))]
 pub async fn publish_newsletter(
     State(AppState {
         connection_pool, ..
     }): State<AppState>,
     Extension(AuthenticatedUser { user_id, .. }): Extension<AuthenticatedUser>,
-    messages: Messages,
     Form(form): Form<BodyData>,
 ) -> Result<Response, AdminError> {
     if let Err(e) = validate_form(&form) {
-        messages.error(e);
         return Err(AdminError::Publish(anyhow::anyhow!(e)));
     }
 
@@ -89,17 +85,9 @@ pub async fn publish_newsletter(
         .try_into()
         .map_err(AdminError::Idempotency)?;
 
-    let success_message = || {
-        messages.success(format!(
-            "The newsletter issue '{}' has been published!",
-            form.title
-        ))
-    };
-
     let mut transaction = match try_processing(&connection_pool, &idempotency_key, user_id).await? {
         crate::idempotency::NextAction::StartProcessing(t) => t,
         crate::idempotency::NextAction::ReturnSavedResponse(response) => {
-            success_message();
             return Ok(response);
         }
     };
@@ -112,8 +100,12 @@ pub async fn publish_newsletter(
         .await
         .context("Failed to enqueue delivery tasks")?;
 
-    let response = Redirect::to("/admin/newsletters").into_response();
-    success_message();
+    let success_message = format!(
+        r#"The newsletter issue "{}" has been published!"#,
+        form.title
+    );
+    let template = SuccessTemplate { success_message };
+    let response = Html(template.render().unwrap()).into_response();
     save_response(transaction, &idempotency_key, user_id, response)
         .await
         .map_err(AdminError::UnexpectedError)