feat: 工单多级审批 + 模版创建 (#6640)

* feat: 工单多级审批 + 模版创建

* feat: 工单权限处理

* fix: 工单关闭后 再审批bug

* perf: 修改一点

Co-authored-by: feng626 <1304903146@qq.com>
Co-authored-by: ibuler <ibuler@qq.com>

apps/tickets/models/flow.py

@@ -0,0 +1,71 @@
+# -*- coding: utf-8 -*-
+#
+from django.db import models
+from django.utils.translation import ugettext_lazy as _
+
+from common.mixins.models import CommonModelMixin
+from common.db.encoder import ModelJSONFieldEncoder
+from orgs.mixins.models import OrgModelMixin
+from orgs.utils import tmp_to_root_org
+from ..const import TicketType, TicketApprovalLevel, TicketApprovalStrategy
+from ..signals import post_or_update_change_ticket_flow_approval
+
+__all__ = ['TicketFlow', 'ApprovalRule']
+
+
+class ApprovalRule(CommonModelMixin):
+    level = models.SmallIntegerField(
+        default=TicketApprovalLevel.one, choices=TicketApprovalLevel.choices,
+        verbose_name=_('Approve level')
+    )
+    strategy = models.CharField(
+        max_length=64, default=TicketApprovalStrategy.super,
+        choices=TicketApprovalStrategy.choices,
+        verbose_name=_('Approve strategy')
+    )
+    # 受理人列表
+    assignees = models.ManyToManyField(
+        'users.User', related_name='assigned_ticket_flow_approval_rule',
+        verbose_name=_("Assignees")
+    )
+    assignees_display = models.JSONField(
+        encoder=ModelJSONFieldEncoder, default=list,
+        verbose_name=_('Assignees display')
+    )
+
+    class Meta:
+        verbose_name = _('Ticket flow approval rule')
+
+    def __str__(self):
+        return '{}({})'.format(self.id, self.level)
+
+    @classmethod
+    def change_assignees_display(cls, qs):
+        post_or_update_change_ticket_flow_approval.send(sender=cls, qs=qs)
+
+
+class TicketFlow(CommonModelMixin, OrgModelMixin):
+    type = models.CharField(
+        max_length=64, choices=TicketType.choices,
+        default=TicketType.general, verbose_name=_("Type")
+    )
+    approval_level = models.SmallIntegerField(
+        default=TicketApprovalLevel.one,
+        choices=TicketApprovalLevel.choices,
+        verbose_name=_('Approval level')
+    )
+    rules = models.ManyToManyField(ApprovalRule, related_name='ticket_flows')
+
+    class Meta:
+        verbose_name = _('Ticket flow')
+
+    def __str__(self):
+        return '{}'.format(self.type)
+
+    @classmethod
+    def get_org_related_flows(cls):
+        flows = cls.objects.all()
+        cur_flow_types = flows.values_list('type', flat=True)
+        with tmp_to_root_org():
+            diff_global_flows = cls.objects.exclude(type__in=cur_flow_types)
+        return flows | diff_global_flows