The focus of this chapter was working with embedded objects and arrays (lists). Projects presented in this chapter, for the most part, were integrated into Django. In this chapter, you learned how to add a complex object containing embedded objects and arrays to the database. In order to accomplish this, you learned how to create entity classes from form data by defining a form service. The form service performed a process called hydration and moved data between form and entity, and back again. You were also shown how to associate embedded objects with their own sub-forms, and how to insert sub-forms into a primary form.

You then learned about adding rooms to a property, which involved creating embedded objects, that were in turn added to an embedded array. When learning how to use the pymongo.collection.update_one() method to update property contact information, you were also shown how to use AJAX requests to pre-populate fields when the value of other fields changed.

In the...