I have a form in heex

<form phx-submit="add_points" >

        <%= number_input :user_points, :points, phx_value_user_id: user.id %>
        <%= submit "Add" %>

      </form>

and a handle event (2 actually):

  def handle_event("add_points", %{"user-id" => user_id}, socket) do
    {:noreply, assign(socket, :user_id, user_id)}
  end

  def handle_event("add_points", %{"user_points" => %{"points" => points_for_user}}, socket) do
    user_id = socket.assigns[:user_id]
    post = socket.assigns[:post]
           |> Repo.preload(:users)
    Events.add_user_points(post, user_id, points_for_user)
    {:noreply, socket}
  end

The problem is that I get an ** (ArgumentError) comparison with nil is forbidden as it is unsafe. If you want to check if a value is nil, use is_nil/1 instead error when using the user_id in a query:

  def add_player_points(%Post{} = post, user_id, points_for_user) do
    pp = post.id
    query = from(pu in PostUser, where: pu.post_id == ^pp and pu.user_id == ^user_id) #here
...

I have tried also this in one handle event:

  def handle_event("add_points", %{"user_points" => %{"points" => points_for_user}}, socket) do
    user_id = "user-id"
    post = socket.assigns[:post]
           |> Repo.preload(:users)
    Events.add_user_points(post, user_id, points_for_user)
    {:noreply, socket}
  end

also

user_id = String.to_integer("user-id") 

Without luck..

What should I do?