The message and activity features
Odoo has global messaging and activity planning features available, all of which are provided by the Discuss application, and a mail technical name.
The messaging features are added by the mail.thread model and make a message widget on form views available, also known as Chatter. This widget allows you to log notes or send messages to other people. It also keeps a history of the messages that have been sent, and it is also used by automatic processes to log progress tracking messages.
The same app also provides activity management features through the mail.activity.mixin model. The activity widget can be added to the form view to allow users to schedule and track the history of activities.
Adding message and activity features
The mail module provides the mail.thread abstract class, which is used to add the messaging features to any model, and mail.activity.mixin, which does the same for the planned activity features. In Chapter 4, Extending...
