Hands-On Reactive Programming in Spring 5

Using ReactiveMongoTemplate

Even though the ReactiveMongoTemplate is used as a building block of a reactive repository, the class itself is very versatile. Sometimes it allows working with the database more efficiently than the higher-level repository does.

For example, let's implement a simple service that uses ReactiveMongoTemplate to find books by title using a regular expression. The implementation may look as follows:

public class RxMongoTemplateQueryService {
   private final ReactiveMongoOperations mongoOperations;            // (1)
   // Constructor...

   public Flux<Book> findBooksByTitle(String titleRegExp) {          // (2)
      Query query = Query.query(new Criteria("title")                // (3)
         .regex(titleRegExp)))
         .limit(100);
      return mongoOperations
         .find(query, Book.class ...