Ruth as an Example of God's Grace

Reading in Neh 13.1, this morning, in which it says that, as they were reading the book of Moses, they read that the Ammonite and Moabite should not come into the congregation of God forever. Ruth was a Moabite, what gives?

It seems pretty clear that the prohibition was for the Moabites as a people, not as individuals. So you have God in essence cursing a people, but then we see him paving the way for individuals to be accepted into the congregation of God. This is grace in action. Ruth was accepted by grace, even though she was a Moabite. I take this to mean that any other Moabite who left their (false) god and turned to the true and living God would be accepted as well.