Part three of this book, Digging Deeper, introduces a large corporation called Book Someplace, Inc. that has complex data needs. This part moves us from the basics and clearly into intermediate to advanced territory. In this part, you'll learn how to define a dataset for a corporate customer with complex requirements, including document structures with embedded arrays and objects. You'll also learn how to handle tasks involving multiple collections, which requires taking advantage of advanced MongoDB features, including aggregation and map-reduce.

In this chapter, we'll expand on the design principles we discussed in Chapter 4, Fundamentals of Database Design, which also apply to this company. A major difference, however, is that in this chapter, you'll learn how to refine your data structures by using embedded documents and...