👐 Remove unused ids from author details in books collection

We want to modify the MongoDB schema so that each book contains an array of its authors. In this step we will remove the redundant ID fields from the join table.

• On the MongoDB diagram view, click the books collection
• On the relational mappings list on the right, click on the edit icon of author_book
• Edit the field name from authorBooks to just authors
• In the list of fields, uncheck authorId and bookId, leaving all fields unchecked.
• Click Save and close

What we have now is an implementation of the Extended reference pattern