The code in this chapter is based on the code created in Chapter 3, Your First Odoo Application. The necessary code can be found in the ch03/ directory of the Git repository at https://github.com/PacktPublishing/Odoo-12-Development-Essentials-Fourth-Edition. The code of this chapter can be found at https://github.com/PacktPublishing/Odoo-12-Development-Essentials-Fourth-Edition/tree/master/ch05/library_app.
You should have it in your add-ons path and install the library_app module. The examples in this chapter will modify and add code in that add-on module.