Behaviour and helper for using PhoenixPageMeta from a LiveView.

In MyAppWeb.live_view/0, add the behaviour and import:

def live_view do
  quote do
    use Phoenix.LiveView, layout: {MyAppWeb.Layouts, :app}
    @behaviour PhoenixPageMeta.LiveView
    import PhoenixPageMeta.LiveView, only: [assign_page_meta: 1]
  end
end

In each LiveView, implement page_meta/2 and call assign_page_meta/1 at the end of mount/3 or handle_params/3 (after any data needed for the meta has been assigned):

@impl PhoenixPageMeta.LiveView
def page_meta(socket, :show) do
  location = socket.assigns.location
  %MyAppWeb.PageMeta{
    title: location.name,
    path: ~p"/locations/#{location.slug}"
  }
end

def handle_params(params, _uri, socket) do
  {:noreply,
   socket
   |> assign(:location, load_location(params))
   |> assign_page_meta()}
end

After assign_page_meta/1, the socket has :page_meta and :page_title assigned, ready for use in layouts and the MetaTags component.