Update schema.py

src/meds/schema.py

@@ -24,23 +24,22 @@
 # We define static events as always occurring on January 1st, 1 AD
 static_event_time = datetime.datetime(1, 1, 1)
 
-
 def patient_schema(per_event_properties_schema=pa.null()):
     # Return a patient schema with a particular per event metadata subschema
     event = pa.struct(
         [
-            ("time", pa.timestamp("us")),
-            ("code", pa.string()),
-            ("text_value", pa.string()),
-            ("numeric_value", pa.float32()),
-            ("properties", per_event_properties_schema),
+            pa.field("time", pa.timestamp("us"), nullable=False),
+            pa.field("code", pa.string(), nullable=False),
+            pa.field("text_value", pa.string()),
+            pa.field("numeric_value", pa.float32()),
+            pa.field("properties", per_event_properties_schema),
         ]
     )
 
     patient = pa.schema(
         [
-            ("patient_id", pa.int64()),
-            ("events", pa.list_(event)),  # Require ordered by time
+            pa.field("patient_id", pa.int64(), nullable=False),
+            pa.field("events", pa.list_(event), nullable=False),  # Require ordered by time
         ]
     )