Returning multiple results

Actions can return multiple results in a single response.

Example

@Button
public Object save() {
    summary = "User " + name + " saved";
    return List.of(
        new Message("User saved"),
        new State(this)
    );
}

What happens

• Message → shows feedback to the user
• State(this) → sends the updated ViewModel state to the frontend

Both are processed in the same request.

Mental model

An action can:

• mutate state
• return UI effects
• return updated state

All of these can be combined in a single response.