Creating Functional Fields with the Odoo API Framework
This video uses the new Odoo 8+ API. So this video should have value for anyone developing Odoo applications Odoo 8 to Odoo 12.
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One of the most powerful features in the Odoo framework is the ability to create functional fields with a great deal of flexibility and power. The beautiful of the design is that the functional fields can be accessed and used in views, processes and transactions just like any other field in your models.
Another nice feature of Odoo's functional fields is you can specify if the field should be re-calculated every time it is accessed or you can store a calculated result in the field and then only have it update on specific triggers.