修复BUG(删除部门): 部门里面存在用户，依然能够删除部门

Closes https://gitee.com/liqianglog/django-vue-admin/issues/I3E2BQ

dvadmin-backend/apps/vadmin/permission/permissions.py

@@ -93,3 +93,23 @@ class CommonPermission(CustomPermission):
         self.message = f"没有此数据操作权限!"
         res = self.check_queryset(request, instance)
         return res
+
+
+class DeptDestroyPermission(CustomPermission):
+    """
+    部门删除权限校验：判断部门下是否有用户存在，存在不可删除
+    """
+    message = '没有有操作权限'
+
+    def has_permission(self, request: Request, view: APIView):
+        return True
+
+    def check_queryset(self, request, instance):
+        if instance.values_list('userprofile', flat=True):
+            self.message = "该部门下有关联用户，无法删除！"
+            return False
+        return True
+
+    def has_object_permission(self, request: Request, view: APIView, instance):
+        res = self.check_queryset(request, instance)
+        return res

dvadmin-backend/apps/vadmin/permission/views.py

@@ -2,7 +2,7 @@ from django.contrib.auth import authenticate
 from rest_framework.request import Request
 from rest_framework.views import APIView
 
-from .permissions import CommonPermission
+from .permissions import CommonPermission, DeptDestroyPermission
 from ..op_drf.filters import DataLevelPermissionsFilter
 from ..op_drf.viewsets import CustomModelViewSet
 from ..permission.filters import MenuFilter, DeptFilter, PostFilter, RoleFilter, UserProfileFilter
@@ -129,7 +129,7 @@ class DeptModelViewSet(CustomModelViewSet):
     filter_class = DeptFilter
     extra_filter_backends = [DataLevelPermissionsFilter]
     update_extra_permission_classes = (CommonPermission,)
-    destroy_extra_permission_classes = (CommonPermission,)
+    destroy_extra_permission_classes = (CommonPermission, DeptDestroyPermission)
     create_extra_permission_classes = (CommonPermission,)
     search_fields = ('deptName',)
     ordering = 'create_datetime'  # 默认排序