defmodule Mv.Membership.MemberEmailCalculation do
  use Ash.Resource.Calculation

  @impl true
  def load(_query, _opts, _context) do
    # We need member_email and user.email
    [:member_email, user: [:email]]
  end

  @impl true
  def calculate(records, _opts, _context) do
    Enum.map(records, fn record ->
      case record.user do
        %{email: user_email} when is_binary(user_email) -> user_email
        _ -> record.member_email
      end
    end)
  end
end