perf: 修改支持 tidb

apps/tickets/models/ticket/general.py

@@ -13,8 +13,8 @@ from django.utils.translation import ugettext_lazy as _
 from common.db.encoder import ModelJSONFieldEncoder
 from common.db.models import JMSBaseModel
 from common.exceptions import JMSException
-from common.utils.timezone import as_current_tz
 from common.utils import reverse
+from common.utils.timezone import as_current_tz
 from orgs.models import Organization
 from orgs.utils import tmp_to_org
 from tickets.const import (
@@ -296,7 +296,7 @@ class Ticket(StatusMixin, JMSBaseModel):
     )
     comment = models.TextField(default='', blank=True, verbose_name=_('Comment'))
     rel_snapshot = models.JSONField(verbose_name=_('Relation snapshot'), default=dict)
-    serial_num = models.CharField(_('Serial number'), max_length=128, unique=True, null=True)
+    serial_num = models.CharField(_('Serial number'), max_length=128, null=True)
     meta = models.JSONField(encoder=ModelJSONFieldEncoder, default=dict, verbose_name=_("Meta"))
     org_id = models.CharField(
         max_length=36, blank=True, default='', verbose_name=_('Organization'), db_index=True
@@ -305,6 +305,9 @@ class Ticket(StatusMixin, JMSBaseModel):
     class Meta:
         ordering = ('-date_created',)
         verbose_name = _('Ticket')
+        unique_together = (
+            ('serial_num',),
+        )
 
     def __str__(self):
         return '{}({})'.format(self.title, self.applicant)
@@ -328,10 +331,10 @@ class Ticket(StatusMixin, JMSBaseModel):
         queries = Q(applicant=user) | Q(ticket_steps__ticket_assignees__assignee=user)
         # TODO: 与 StatusMixin.process_map 内连表查询有部分重叠 有优化空间 待验证排除是否不影响其它调用
         prefetch_ticket_assignee = Prefetch('ticket_steps__ticket_assignees',
-            queryset=TicketAssignee.objects.select_related('assignee'), )
-        tickets = cls.objects.prefetch_related(prefetch_ticket_assignee)\
-            .select_related('applicant')\
-            .filter(queries)\
+                                            queryset=TicketAssignee.objects.select_related('assignee'), )
+        tickets = cls.objects.prefetch_related(prefetch_ticket_assignee) \
+            .select_related('applicant') \
+            .filter(queries) \
             .distinct()
         return tickets