[Feature] 添加申请资产工单

apps/common/db/aggregates.py

@@ -0,0 +1,28 @@
+from django.db.models import Aggregate
+
+
+class GroupConcat(Aggregate):
+    function = 'GROUP_CONCAT'
+    template = '%(function)s(%(distinct)s %(expressions)s %(order_by)s %(separator))'
+    allow_distinct = False
+
+    def __init__(self, expression, distinct=False, order_by=None, separator=',', **extra):
+        order_by_clause = ''
+        if order_by is not None:
+            order = 'ASC'
+            prefix, body = order_by[1], order_by[1:]
+            if prefix == '-':
+                order = 'DESC'
+            elif prefix == '+':
+                pass
+            else:
+                body = order_by
+            order_by_clause = f'ORDER BY {body} {order}'
+
+        super().__init__(
+            expression,
+            distinct='DISTINCT' if distinct else '',
+            order_by=order_by_clause,
+            separator=f'SEPARATOR {separator}',
+            **extra
+        )