For this recipe, we will be using the my_library module from Chapter 9, Advanced Server-Side Development Techniques. That module manages books and their categories. It also records book loans. We added an initial module, Chapter13/r0_initial_module/my_library, in the GitHub repository for this book to help you get started: https://github.com/PacktPublishing/Odoo-12-Development-Cookbook-Third-Edition.