MongoDB is doing great, firmly holding a prestigious #5 on the db-engines ranking site. It means that we, developers, are using it a lot.

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When looking at the official driver API, we can see an effort to make an API as fluent as possible:

collection.find(and(gte(“stars”, 2), lt(“stars”, 5), eq(“categories”, “Bakery”)));

Yet, there are many issues:

• All fields are Strings without auto-completion. 
• No type safety on operators (Is stars a number? Is categories a collection (?) of Strings or...?!). 
• Do we really like using gte for >= ? I mean, is it easy to read and understand this expression?
• And finally, when the schema changes, we are back to 80' with find-replace...

Fortunately, there is a simple and effective solution to those issues  —  FluentMongo, which adds the missing ingredient to the API  —  type safety and Java integration. It lets you use normal Java to write filters, projections, updates, sorts, and indexes. For example:

collection.find(builder.filter(r -> r.getStars() >= 2 && r.getStars() < 5 &&
                                    r.getCategories().contains("Bakery")));

You can be both productive with MongoDB and write a maintainable code now!

Further Reading

MongoDB in a Java Application for Basic Usage

MongoDB Integration With Java