Our business logic can make use of this messaging system to send notifications to users. To post a message we use the message_post() method. For example:
self.message_post('Hello!')
This adds a simple text message, but sends no notification to the followers. That is because by default the mail.mt_note subtype is used for the posted messages. But we can have the message posted with the particular subtype we want. To add a message and have it send notifications to the followers, we should use the following:
self.message_post('Hello again!', subtype='mail.mt_comment')
We can also add a subject line to the message by adding the subject parameter. The message body is HTML, so we can include markup for text effects, such as <b> ...
