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elixirphoenix-live-view

How to update the value of nested assigns in LiveView

I’m trying to use nested assigns but cannot find a way to update its values… Imagine I have this:

def mount(socket) do
    socket = assign(socket, state: [value1: "20", value2: "50"])
    {:ok, socket} 
end

How do I update the value here?

def handle_event("dec", _params, socket) do
    socket = assign(socket, state[:value1], "1")
    {:noreply, socket}
end

How do I reference/represent that nested key?

Solution

  • Kernel.update_in/3 is your friend here.

    state = [value1: "20", value2: "50"]
update_in state, [:value1], & &1 <> "updated"
#⇒ [value1: "20updated", value2: "50"]

    Sidenote: this question has nothing to do with .