Hey all, I’m learning Phoenix and LiveView, and I don’t understand how to preserve a value between live views.
TL; DR: Is there a way to “pass” a value stored in Phoenix.LiveView.Socket assigns when navigating from one LiveView page to another one?
More details: I tried to follow a basic guide and created a Thermostat view with a plus button to increase it’s temperature value. I then created (copied) a separate ThermostatDec view module with a minus button and event handler to decrement value with the same name.
Next, I added them both into my router.ex under
scope "/" ... do
live_session :live_experiments do
live "/thermostat", Thermostat
live "/thermostat/1", ThermostatDec
end
end
Finally, I added a <.link navigate=“…”> on both pages to lead from one to another, and replaced last line in mount/3 to :ok, assign_new(socket, :temperature, fn -> temperature end)} on both views.
My assumption was that since both views are in the same live_session, and I’m using assign_new - then upon switching a page I’ll be able to reuse temperature from the last page, but instead I’m getting a socket with assigns: #Phoenix.LiveView.Socket.AssignsNotInSocket<> every time.
So, I wonder - is there a way to carry a value from one view onto another one, or does it make no sense?
I realize I can pass a user_token from phx.gen.auth in session argument, store user’s temperature in DB, fetch it in each mount, and update on every button click, I’m just curious if there is something else that I’m missing.
