Does not seem possible to use assign in custom error html

[srcrip]

Does not seem possible to use assign in custom error html

[agonzalezro]

@srcrip assign expects the socket as the first argument. I am not sure if you would be able to get the socket in the custom errors, but for this specific example you are mentioning maybe it's enough with:

defmodule ExampleWeb.ErrorHTML do
  use ExampleWeb, :html

  def render("404.html" = template, assigns) do
    message = "hello"

    ~H"""
    <h1 class="text-2xl font-bold tracking-tight text-gray-900 sm:text-4xl">
      <%= @status %> <%= message %>
    </h1>
    """
  end
end

I know that you pasted just an example so maybe it doesn't fit what you need. But let me know.

[josevalim]

The error message is correct. This is not the render function of a LiveView nor of a component. We could relax it here and allow assign to work with any map, but there is no change tracking happening here whatsoever, so I am unsure if we should do it. It is up to @chrismccord to decide if he wants to allow assigns to be used anywhere, even outside of the regular rendering stack.