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Implement Add to List for dynamodb:UpdateItem (#3585)

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This handles the add-to-list case using the legacy `AttributeUpdates` parameter.

* Added test coverage.
* Verified against real AWS backend.

Closes #3561
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Brian Pandola 2021-01-10 06:20:41 -08:00 • committed by GitHub
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4
moto/dynamodb2/models/__init__.py
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@ -156,6 +156,10 @@ class Item(BaseModel):
existing = self.attrs.get(attribute_name, DynamoType({"SS": {}}))
new_set = set(existing.value).union(set(new_value))
self.attrs[attribute_name] = DynamoType({"SS": list(new_set)})
elif set(update_action["Value"].keys()) == {"L"}:
existing = self.attrs.get(attribute_name, DynamoType({"L": []}))
new_list = existing.value + new_value
self.attrs[attribute_name] = DynamoType({"L": new_list})
else:
# TODO: implement other data types
raise NotImplementedError(