Macros

pub async fn my_view(mut request: Request) -> AppResult<Response> {
    let articles = vec!["Article 1", "Article 2"];

    // Inject into Tera context
    context_update!(request => {
        "title"    => "My page",
        "articles" => &articles,
        "count"    => articles.len(),
    });

    request.render("my_page.html")
}

// In a handler
success!(request.notices => "Saved successfully!");
error!(request.notices   => "An error occurred.");
info!(request.notices    => "Checking...");
warning!(request.notices => "Warning: session expiring soon.");

// flash_now! — message injected directly into context
context_update!(request => {
    "messages" => flash_now!(success => "Created!"),
});

// `?` works on DbErr and anyhow::Error out of the box:
// Runique converts them into AppError (impl_from_error! in the framework).
pub async fn handler(mut request: Request) -> AppResult<Response> {
    let article = Article::find_by_id(1)
        .one(&request.engine.db)
        .await?;                        // DbErr -> AppError
    context_update!(request => { "article" => &article });
    request.render("page.html")
}

// Your own error: build the AppError explicitly
return Err(Box::new(AppError::new(ErrorContext::not_found("Article not found"))));