So many nil check

t.ex

# Assuming get(id) is database hit, so we don't want to hit database for everything up-front

def some_func(id1, id2, id3) do
  if EntityA.get(id1) == nil do
    {:error, :not_found}
  else
    if EntityB.get(id2) == nil do
      {:error, :not_found}
    else
      if EntityC.get(id3) == nil do
        {:error, :not_found}
      else
        # Start do something
      end
    end
  end
end