From d7e8f61e76af7ea47885576039b2e22be382cbf4 Mon Sep 17 00:00:00 2001
From: Harpo Harbert <ryan_harbert@wgbh.org>
Date: Fri, 8 Sep 2023 10:39:44 -0700
Subject: [PATCH] Fixes date serializer

---
 chowda/fields.py | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/chowda/fields.py b/chowda/fields.py
index 4d005c5a..20dc582d 100644
--- a/chowda/fields.py
+++ b/chowda/fields.py
@@ -1,4 +1,5 @@
 from dataclasses import dataclass
+from datetime import datetime
 from typing import Any
 
 from starlette.datastructures import FormData
@@ -101,6 +102,19 @@ async def parse_obj(self, request: Request, obj: Any) -> Any:
 
         return [run.dict() for run in new_runs or obj.metaflow_runs]
 
+    async def serialize_value(
+        self, request: Request, value: Any, action: RequestAction
+    ) -> Any:
+        return [
+            {
+                **run,
+                'finished_at': run['finished_at'].isoformat()
+                if run.get('finished_at')
+                else None,
+            }
+            for run in value
+        ]
+
 
 @dataclass
 class BatchPercentCompleted(BaseField):