How does "restrict" work when defining document relationships?

In the support thread, a developer is asking how the "restrict" setting works when defining document relationships between the "User" and "Post" collections. They want to know what is restricted if they choose this option for document deletion. In response to their question, the "restrict" setting means that if a document is connected to another document through a relationship, it cannot be deleted as long as the relationship exists. In this case, if the developer chooses "restrict" for document deletion, posts cannot be deleted as long as they have authors, and vice versa. Solution: To implement the desired behavior, the developer can choose the "restrict