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normalizers.py

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+from .operator import StreamInstanceOperator
+
+from typing import List, Dict, Any
+
+
+class NormalizeListFields(StreamInstanceOperator):
+    fields: List[str]
+    key_prefix: str = ""
+    empty_value: str = ""
+    separator: str = ", "
+
+    def process(self, instance: Dict[str, Any], stream_name: str = None) -> Dict[str, Any]:
+        for field in self.fields:
+            assert field in instance, f"Field {field} not found in instance {instance}"
+            assert isinstance(instance[field], list), f"Field {field} should be a list, got {type(instance[field])}"
+
+            target_key = self.key_prefix + field
+
+            if len(instance[field]) == 0:
+                instance[target_key] = self.empty_value
+            elif len(instance[field]) == 1:
+                instance[target_key] = instance[field][0]
+            else:
+                instance[target_key] = self.separator.join(instance[field])
+
+        return instance