Embedded documents

A better data-modeling solution would be simply to collapse the normalized relationships and fold the related information into embedded (https://docs.mongodb.com/manual/core/data-model-design/#data-modeling-embedding) documents. Using the preceding example, the better solution would appear as follows:

Using embedded documents, with a single query, you can easily obtain a consolidated block of information, which includes the customer name, purchase date, and specifics on the item.