Hi,

I’m trying to generate a module with a function at runtime (from an Phoenix LiveView handle_params function), but I’m not able to make my code work.

Here is a sample code that fails:

page = "TestPage"
mod_name = Module.concat(MyProject.Pages, page)

Module.create(
      mod_name,
      quote do
        def render(assigns) do
          :ok
        end
      end,
      line: 1,
      file: "no_file.exs"
    )

When I run this code (inside a handle_params function from a LiveView) I get this CompileError:

error: cannot invoke remote function Phoenix.Component.Declarative.__pattern__!/2 inside a match
└─ no_file.exs:1: MyProject.Pages.TestPage.render/1

What does it mean?
Am i missing something?

My code seems pretty simple, but still, it does not work.
I’m not a macro expert, maybe there is something I misunderstood.

When I try the same code with no argument for the render function, it works.
But as soon as I add an argument, it fails.

Thank you for your help