Trying to do something like.

some_route = "foo/bar"
~p"#{some_route}"

Aside from the fact the compile checker complains, the / in between foo and bar gets escaped inside the ~p somewhere so the request ends up crying that foo%2Fbar can be found.

I realize this has everything to do with escapable chars in my strings.

My question is: what is the best way to go about something like this?
I ran into this issue as a result of generators and the patch assignment on the Live component for the FormComponent.

The issue was, I wanted to use a slug as a @derived param for my resource. But the patch=~p/ does not account for the update to the slug on the post in question when pushing the patch. For example.

  defp save_post(socket, :edit, post_params) do
    case Blog.update_post(socket.assigns.post, post_params) do
      {:ok, post} ->

        {:noreply,
         socket
         |> put_flash(:info, "Post updated successfully")
         |> push_patch(to:  ~p"/#{socket.assigns.patch}")}
...
    end
  end

This has no way of pulling out the new slug from the updated post value. Thus it tried to push patch to the prior value. The idea I had was to break apart the patch assignments. Something like.

  defp save_post(socket, :edit, post_params) do
    case Blog.update_post(socket.assigns.post, post_params) do
      {:ok, post} ->
        notify_parent({:saved, post})

        {:noreply,
         socket
         |> put_flash(:info, "Post updated successfully")
         |> push_patch(to:  ~p"/#{socket.assigns.patch}/#{post.slug}")}

      {:error, %Ecto.Changeset{} = changeset} ->
        {:noreply, assign_form(socket, changeset)}
    end
  end

note: p"/#{socket.assigns.patch}/#{post.slug}")

And at the time of assignment.

  <.live_component
    module={MorphicProWeb.Admin.PostLive.FormComponent}
    id={@post.id}
    title={@page_title}
    action={@live_action}
    post={@post}
    patch={"admin/posts")}
  />

Thus admin/posts turns into admin&2Fposts and fails. Also note I could not get the protocol to_params to work on the post thus I’m passing it explicitly the slug via. post.slug so there’s that too.

Any input would be great, thanks.