add missing default value on some endpoints

arkindex/documents/serializers/ml.py

@@ -271,7 +271,7 @@ class TranscriptionCreateSerializer(serializers.ModelSerializer):
         max_value=1,
         required=False,
     )
-    orientation = EnumField(TextOrientation, required=False)
+    orientation = EnumField(TextOrientation, default=TextOrientation.HorizontalLeftToRight, required=False)
 
     class Meta:
         model = Transcription
@@ -328,7 +328,7 @@ class SimpleTranscriptionSerializer(serializers.Serializer):
         max_value=1,
         required=False,
     )
-    orientation = EnumField(TextOrientation, required=False)
+    orientation = EnumField(TextOrientation, default=TextOrientation.HorizontalLeftToRight, required=False)
 
     def validate(self, data):
         if not ('score' in data) ^ ('confidence' in data):
@@ -400,7 +400,7 @@ class TranscriptionBulkItemSerializer(serializers.Serializer):
         help_text='This field is deprecated; please use the `confidence` field instead.'
     )
     confidence = serializers.FloatField(min_value=0, max_value=1, required=False)
-    orientation = EnumField(TextOrientation, required=False)
+    orientation = EnumField(TextOrientation, default=TextOrientation.HorizontalLeftToRight, required=False)
 
     def validate(self, data):
         # Element retrieval and checks is done in the BulkSerializer to avoid duplicate queries
@@ -451,6 +451,7 @@ class TranscriptionBulkSerializer(serializers.Serializer):
                 worker_version=validated_data['worker_version'],
                 element_id=transcription['element_id'],
                 text=transcription['text'],
+                orientation=transcription['orientation'],
                 confidence=transcription['confidence'],
             )
             for transcription in validated_data['transcriptions']