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Odoo 11 Development Cookbook - Second Edition - Second Edition
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Hierarchies are represented using model relations with itself; each record has a parent record in the same model and also has many child records. This can be achieved by simply using many-to-one relations between the model and itself.
However, Odoo also provides improved support for this type of field using the Nested set model (https://en.wikipedia.org/wiki/Nested_set_model). When activated, queries using the child_of operator in their domain filters will run significantly faster.
Staying with the Library Books example, we will build a hierarchical category tree that can be used to categorize books.
We will reuse the my_module addon module from Chapter 4,Creating Odoo Addon Modules.
We will add a new Python file, models/library_book_categ.py, for the category tree, shown as follows:
models/__init__.py:from . import library_book_categ