Ecto not allowing string interpolation in fragments?

Questions & Help Questions
16

So this appears to work:

  defmacro exists_frag(table) do
    arguments = ["EXISTS (
      SELECT 1
      FROM #{table} a
      WHERE a.my_column = ?
    )", (quote do: x.id)]
    quote do: fragment(unquote_splicing(arguments))
  end

  def foo() do
    from(x in My.Schema,
      where: exists_frag("my_table_name")
    )
  end

I used this blog post as well: https://dreamconception.com/tech/ecto-how-to-build-dynamic-fragments-and-case-statements/