feat: serialize named tuples as dicts

databroker/client.py

@@ -9,10 +9,10 @@
 from tiled.client.utils import handle_error
 from tiled.utils import safe_json_dump
 
-from .common import BlueskyEventStreamMixin, BlueskyRunMixin, CatalogOfBlueskyRunsMixin
+from .common import (BlueskyEventStreamMixin, BlueskyRunMixin,
+                     CatalogOfBlueskyRunsMixin)
+from .document import DatumPage, Descriptor, EventPage, Resource, Start, Stop
 from .queries import PartialUID, RawMongo, ScanID
-from .document import Start, Stop, Descriptor, EventPage, DatumPage, Resource
-
 
 _document_types = {
     "start": Start,
@@ -318,12 +318,18 @@ def v1(self):
             self._v1 = Broker(self)
         return self._v1
 
+    def _namedtuple_asdict_default(obj):
+        """Convert NamedTuple to dict before serialization."""
+        if isinstance(obj, tuple) and hasattr(obj, "_asdict"):  # NamedTuple check
+            return obj._asdict()
+        raise TypeError(f"Type {type(obj)} is not JSON serializable")
+
     def post_document(self, name, doc):
         link = self.item["links"]["self"].replace(
             "/metadata", "/documents", 1
         )
         response = self.context.http_client.post(
             link,
-            content=safe_json_dump({"name": name, "doc": doc})
+            content=safe_json_dump({"name": name, "doc": doc}, default=self._namedtuple_asdict_default)
         )
         handle_error(response)