Gives me an error

available = fields.Selection([('yes', 'Yes'), ('no', 'No')], string='Available', default='no', compute='_compute_available_badge')
    checkbox_field = fields.Boolean(string='Checkbox Field')

    @api.depends('checkbox_field')
    def _compute_available_badge(self):
        for record in self:
            if record.checkbox_field:
                record.available = 'no'
            else:
                record.available = 'yes'
    


Add this compute, it will always change the selection field value based on the boolean field

Edited : Apologise, I forgot to add the compute to the field definition.. please try it now, I have edited the code