Step 5 calls self.book_id.with_context() with some keyword arguments. This returns a new version of book_id (which is a library.book recordset) with the keys added to the current context. We are adding one key here, avoid_deactivate=True, but you can add multiple keys if you want.

In step 6, we checked whether the context has a positive value for the avoid_deactivate key. We avoid deactivating books, so the librarian can see them even if they are lost.

This is just a simple example of a context, but you can use it anywhere in the ORM, based on your requirements.