Add the cancel button to Author's FormComponent.

lib/decentralised_book_index_web/live/author_live/form_component.ex

@@ -48,6 +48,7 @@ defmodule DecentralisedBookIndexWeb.AuthorLive.FormComponent do
 
         <:actions>
           <.button phx-disable-with="Saving...">Save Author</.button>
+          <.button phx-click="cancel" phx-target={@myself} class="me-auto">Cancel</.button>
         </:actions>
       </.simple_form>
     </div>
@@ -84,6 +85,17 @@ defmodule DecentralisedBookIndexWeb.AuthorLive.FormComponent do
     end
   end
 
+  def handle_event("cancel", _params, socket) do
+    author = socket.assigns.author
+    author_id = if author == nil, do: nil, else: author.id
+
+    socket =
+      socket
+      |> push_redirect(to: patch_url(socket.assigns.action, author_id))
+
+    {:noreply, socket}
+  end
+
   defp notify_parent(msg), do: send(self(), {__MODULE__, msg})
 
   defp assign_form(%{assigns: %{author: author}} = socket) do