How do I get path parameters in LiveView?

Questions & Help Questions
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1

My router:

live "/cities/:id/users", CityLive

I tried the handle_params function but it was never called:

def handle_params(%{"id" => id}, _uri, socket) do
  # some code
end

I tried to follow the practice in the chrismccord/phoenix_live_view_example project and still failed (session is always %{})：

def mount(%{path_params: %{"id" => id}}, socket) do
  # some code
end

Can see the parameters from the log:

image

Can anyone tell me what is missing?