Simplify ShowLive to avoid handle_params

[josevalim]

No description provided.

[SteffenDE]

I do wonder if this is something that will confuse people as soon as they adjust their ShowLive to use something that patches the LV.

[error] GenServer #PID<0.829.0> terminating
** (UndefinedFunctionError) function TestappWeb.PostLive.Show.handle_params/3 is undefined or private
    (testapp 0.1.0) TestappWeb.PostLive.Show.handle_params(%{"foo" => "bar", "id" => "1"}, "http://localhost:4000/posts/1?foo=bar", #Phoenix.LiveView.Socket<id: "phx-GB49kUwpUq_z4wAl", endpoint: TestappWeb.Endpoint, view: TestappWeb.PostLive.Show, parent_pid: nil, root_pid: #PID<0.829.0>, router: TestappWeb.Router, assigns: %{post: %Testapp.Blog.Post{__meta__: #Ecto.Schema.Metadata<:loaded, "posts">, id: 1, title: "test", body: "123", inserted_at: ~U[2025-01-26 12:22:20Z], updated_at: ~U[2025-01-26 12:22:20Z]}, __changed__: %{}, page_title: "Show Post", flash: %{}, live_action: :show}, transport_pid: #PID<0.821.0>, ...>)
    (phoenix_live_view 1.0.2) lib/phoenix_live_view/utils.ex:456: anonymous fn/5 in Phoenix.LiveView.Utils.call_handle_params!/5
    (telemetry 1.3.0) /Users/steffen/oss/phoenix/installer/testapp/deps/telemetry/src/telemetry.erl:324: :telemetry.span/3
    (phoenix_live_view 1.0.2) lib/phoenix_live_view/channel.ex:148: Phoenix.LiveView.Channel.handle_info/2
    (stdlib 6.0) gen_server.erl:2173: :gen_server.try_handle_info/3
    (stdlib 6.0) gen_server.erl:2261: :gen_server.handle_msg/6
    (stdlib 6.0) proc_lib.erl:329: :proc_lib.init_p_do_apply/3

[josevalim]

If that's the case, then we need to improve the error message in LiveView. But a general rule we follow with generators is to avoid "future code": adding features and code in case someone may need it, as that's an easy way to bring a lot of complexity.

[SteffenDE]

Thank you! I'll send a PR to improve the warning in LV.