i'm writing a ticketing module and i need the assigned employee to a specific ticket to be automatically follow the ticket the thing as is it followers are added form res.partner model and i need to add them from hr.employee and res.partner

here is my work around 

python:

class ticket(models.Model):
	_name = 'itmangement.ticket'
	_description = 'IT Ticket Management Process'
	_inherit = ['mail.thread', 'ir.needaction_mixin']
        #some other fields
        assigned_to_id = fields.Many2many('hr.employee', string="Assigned To")
        employee_message_follower_ids=fields.Many2many('hr.employee')
        @api.one
        def action_assign(self):
             self.employee_message_follower_ids = [(6,0,self.assigned_to_id.ids)]
and the view:
<div class="oe_chatter">
    <field name="message_follower_ids" widget="mail_followers"/>
    <field name="message_ids" widget="mail_thread"/>
</div>					
<div class="oe_chatter">
    <field name="employee_message_follower_ids" widget="mail_followers"/>
</div>