This article is part of Robert Sheldon’s continuing series on Mongo DB. To see all of the items in the series, click here.
In the previous article in this series, I introduced you to schema validation in MongoDB. I described how you can define validation rules on a collection and how those rules validate document inserts and updates. In this article, I continue the discussion by explaining how to apply validation rules to documents that already exist in a collection. Before you start in on this article, however, I recommend that you first review the previous article for an introduction