How to track field changes and log it in the chatter

Question

In many cases in Odoo, like Opportunities for example, if we change certain fields (*Expected Revenue *etc.), it automatically logs it in the chatter with the message:
*Expected Revenue: *50000 -> 60000
or something like that. Does anyone know how this is achieved exactly? Because, it doesn't seem to send this text as a message when writing a record, it just seems to be part of some default functionality

Jean-Jacques BOIS · Accepted Answer

Hello,
How can we do that if we want to track a system field that doesn't allow to change "track_visibility" in the parameters (read only)?

Serpent Consulting Services Pvt. Ltd. · Answer

Hello Shawn,
The main key of the message is "track_visibility" parameter in the fields.
Source [1]
Forum: What is _track Property is? [2]
Documentation: What is _track Property is? [3]

[1] https://github.com/odoo/odoo/blob/8.0/addons/sale/sale.py#L228
[2] https://www.odoo.com/forum/help-1/question/what-is-the-track-proprerty-of-mail-thread-model-used-for-1704
[3] https://www.odoo.com/forum/how-to/developers-13/what-is-the-track-proprerty-of-mail-thread-model-used-for-1704

TaqseetElectronics, Mohamed Arafat · Answer

Thanks, yes that is the perfect answer to what I was looking .. because i can't use python code in pycharm yet

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