add encoder for list when using native types

Author: darshanime-d11

snowfakery/data_generator_runtime_object_model.py

@@ -19,7 +19,7 @@
 # objects that represent the hierarchy of a data generator.
 # roughly similar to the YAML structure but with domain-specific objects
 Definition = Union["ObjectTemplate", "SimpleValue", "StructuredValue"]
-FieldValue = Union[None, Scalar, ObjectRow, tuple, PluginResult, ObjectReference]
+FieldValue = Union[None, Scalar, ObjectRow, tuple, PluginResult, ObjectReference, list]
 
 
 class FieldDefinition(ABC):

snowfakery/output_streams.py

@@ -61,6 +61,7 @@ class OutputStream(ABC):
         type(None): noop,
         bool: int,
         Decimal: str,
+        list: lambda data_list: json.dumps(data_list),
     }
     uses_folder = False
     uses_path = False

tests/test_json.yml

@@ -0,0 +1,4 @@
+- snowfakery_version: 3
+- object: SomeObject
+  fields:
+    formula_field_example: ${{fake.json(data_columns={'Spec':'@1.0.1', 'ID':'pyint','Details':{'Name':'name', 'Address':'address'}}, num_rows=10)}}