Flash Messages

Server-side session notifications, displayed once after redirect.

Click the button to inject all 4 message types and see them displayed.

4 available levels

Success — successful action, save, login
Info — neutral information
Warning — attention required
Error — error, access denied

views.rs — injection dans la vue

pub async fn about(
    mut request: Request,
) -> AppResult<Response> {
    success!(request.notices => "Action successful.");
    info!(request.notices => "Information message.");
    warning!(request.notices => "Attention required.");
    error!(request.notices => "An error occurred.");

    request.render("about/about.html")
}

views.rs — pattern redirect typique

// After an action: add + redirect
pub async fn create_post(
    request: Request,
    Prisme(mut form): Prisme<BlogForm>,
) -> AppResult<Response> {
    if request.is_post() && form.is_valid().await {
        form.save(&db).await?;
        success!(request.notices => "Article published!");
        return Ok(Redirect::to("/blog").into_response());
    }
    request.render("blog/blog.html")
}

flash_now! — immediate message without session

// Display the message on the current page (no redirect)
flash_now!(error => request, "Invalid form.");

index.html — affichage dans le template

<!-- dans le layout de base -->
<main>
    {% block messages %}
        {% messages %}
    {% endblock %}
    {% block content %}{% endblock %}
</main>

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