support resolve_inner_expression in aggregates.

Author: WaVEV

django_mongodb/aggregates.py

@@ -10,7 +10,14 @@
 MONGO_AGGREGATIONS = {Count: "sum"}
 
 
-def aggregate(self, compiler, connection, operator=None, **extra_context):  # noqa: ARG001
+def aggregate(
+    self,
+    compiler,
+    connection,
+    operator=None,
+    resolve_inner_expression=False,
+    **extra_context,  # noqa: ARG001
+):
     if self.filter:
         node = self.copy()
         node.filter = None
@@ -20,6 +27,8 @@ def aggregate(self, compiler, connection, operator=None, **extra_context):  # no
     else:
         node = self
     lhs_mql = process_lhs(node, compiler, connection)
+    if resolve_inner_expression:
+        return lhs_mql
     operator = operator or MONGO_AGGREGATIONS.get(self.__class__, self.function.lower())
     return {f"${operator}": lhs_mql}