How to send some message to users in a specific group by clicking a button?

Question

I am trying to message users who are  in a specific group with the message channel  by clicking a button.
I tried message_post and message_subscribe, not work ideally.
I refered the base_tier_validation but I found that the base_tier_validation uses getattr(self, post) or getattr(self, subscribe).
Got no clue to archieve it.
Can anybody tell me how to achieve this? Thank you and Regards.

Enish · Accepted Answer

It solved refering to  https://www.odoo.com/zh_CN/forum/bang-zhu-1/how-to-show-message-type-notification-in-a-portal-chatter-191116 [1]

[1] https://www%5C.odoo%5C.com/zh_CN/forum/bang%5C-zhu%5C-1/how%5C-to%5C-show%5C-message%5C-type%5C-notification%5C-in%5C-a%5C-portal%5C-chatter%5C-191116

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