You should now be able to create new modules to extend existing modules. We saw how to extend the To-Do module created in the previous chapter.

New features were added onto the several layers that make up an application. We extended the Odoo model to add new fields, and extended the methods with its business logic. Next, we modified the views to make the new fields available on them. Finally, you learned how to extend a model by inheriting from other models, and we used that to add the social network features to our To-Do app.

With these three chapters, we had an overview of the common activities involved in Odoo development, from Odoo installation and setup to module creation and extension. The next chapters will focus on specific areas, most of which we visited briefly in these overviews. In the following chapter, we will address data serialization and the usage of XML and CSV files in more detail.