More model inheritance mechanisms

The previous section discussed classic inheritance, which can be seen as an in-place extension. This is the most frequently used approach, but the Odoo framework also supports a few other extension mechanisms that are useful in other cases.

These are delegation inheritance, prototype inheritance, and the use of mixins:

• Delegation inheritance embeds another model in the inheriting one. For example, a User record embeds a Partner record, so that a User record has all the fields available for the Partner records, plus the fields specific to the User records. It is used through the _inherits attribute.
• Prototype inheritance creates a new model by copying the features from the inherited model and has a database table and data. It is not used often and it is never used in the Odoo-included add-on modules. It is used to set _inherit with the model to copy and the _name attribute with the identifier for the new model to be created.
• Mixin...