Odoo 12 Development Essentials - Fourth Edition

Modifying existing fields

As seen in the previous section, adding new fields to an existing Model is quite straightforward. Sometimes, we want to modify an existing field. This is also simple to do.

When extending a Model, existing fields can be modified incrementally. This means that we just need to define the field attributes to change or add.

We will make two simple changes to the Book fields that were originally created in the library_app module:

• Add a help tooltip to the isbn field, explaining that we now also support 10-digit ISBNs (we will implement this later in the chapter)
• Add a database index on the publisher_id field to make searches on it more efficient

We should edit the library_member/models/library_book.py file, and add ...