Adds detail error messages for missing ion_type. (#138)

amazon-ion · Feb 4, 2021 · f8c61fb · f8c61fb
1 parent a148825
commit f8c61fb
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/amazon/ion/simpleion.py b/amazon/ion/simpleion.py
@@ -209,6 +209,8 @@ def _dump(obj, writer, from_type, field=None, in_struct=False, depth=0):
     except AttributeError:
         ion_type = _ion_type(obj, from_type)
         ion_nature = False
+    if ion_type is None:
+        raise IonException('Value must have a non-None ion_type: %s, depth: %d, field: %s' % (repr(obj), depth, field))
     if not null and ion_type.is_container:
         if ion_nature:
             event = obj.to_event(IonEventType.CONTAINER_START, field_name=field, in_struct=in_struct, depth=depth)