This method in custom model alert

here action have current object and mail depends on it.

def send_alert_mail(self, action):
           for record in self:
            alrt_mail=[]
            if record.template_id:
                mail_id = self.env['mail.template']
                current_obj = action.values()             #record.template_id is selected template obj.

                        values = mail_id.generate_email(record.template_id.id,current_obj[0])

                for u in record.alrt_users_ids:
                    if u.email:

                        alrt_mail.append(u.res_usr_id.partner_id.id)
                if alrt_mail:
                    values['partner_ids'] = [(6,0,[alrt_mail])]
                    values['email_from'] = record.act_user_id.login
                    mail_mail_obj = self.env['mail.message']
                    msg_id = mail_mail_obj.create(values)
            return True

result = method(recs, *args, **kwargs)
  File "/home/pchouksey1/workspace/dexciss/simple/simple_10/repo1010/alert_management/model/alert_management.py", line 350, in create
    action._process(action._filter_post(record))
  File "/home/pchouksey1/workspace/dexciss/simple/simple_10/repo1010/alert_management/model/alert_management.py", line 207, in _process
    self.send_mail(records, action_done)
  File "/home/pchouksey1/workspace/dexciss/simple/simple_10/repo1010/alert_management/model/alert_management.py", line 229, in send_mail
    values = mail_id.generate_email(record.template_id.id,current_obj[0])
  File "/home/pchouksey1/workspace/dexciss/simple/simple_10/core10/addons/mail/models/mail_template.py", line 496, in generate_email
    if template.lang:
AttributeError: 'bool' object has no attribute 'lang'

how to resolve error or there is any solution for send mail using template in odoo10