adapted from https://github.com/magicmark/moto-issue-demo
$ git clone https://github.com/windhamg/moto-issue-demo.git
$ cd moto-issue-demo
$ poetry install
$ poetry run pytest -vvv try:
order_breakfast()
except BaseException as err:
> assert 'Item' in err.response
E AssertionError: assert 'Item' in {'Error': {'Code': 'ConditionalCheckFailedException', 'Message': 'The conditional request failed'}, 'ResponseMetadata': {'HTTPHeaders': {'content-type': 'application/json', 'x-amzn-errortype': 'ConditionalCheckFailedException'}, 'HTTPStatusCode': 400, 'RetryAttempts': 0}, 'message': 'The conditional request failed'}
E + where {'Error': {'Code': 'ConditionalCheckFailedException', 'Message': 'The conditional request failed'}, 'ResponseMetadata': {'HTTPHeaders': {'content-type': 'application/json', 'x-amzn-errortype': 'ConditionalCheckFailedException'}, 'HTTPStatusCode': 400, 'RetryAttempts': 0}, 'message': 'The conditional request failed'} = ConditionalCheckFailedException('An error occurred (ConditionalCheckFailedException) when calling the UpdateItem operation: The conditional request failed').response
tests/test_order_breakfast.py:40: AssertionError
========================================================================= short test summary info ==========================================================================
FAILED tests/test_order_breakfast.py::test_breakfast_order - AssertionError: assert 'Item' in {'Error': {'Code': 'ConditionalCheckFailedException', 'Message': 'The conditional request failed'}, 'ResponseMetadata': {'HTTPHeaders'...
============================================================================ 1 failed in 0.42s =============================================================================
With DynamoDB+boto3, when an update_item operation fails due to a ConditionExpression failing, AND we've set ReturnValuesOnConditionCheckFailure="ALL_OLD", we should see the current item in the error response.
For example, if we ran order-breakfast when hitting DynamoDB for real, here's the output of catching the exception and pprinting ex.response:
{
'Error': {
'Code': 'ConditionalCheckFailedException',
'Message': 'The conditional request failed'
},
'Item': {
'customer': {
'S': 'mark'
},
'lock': {
'M': {
'acquired_at': {
'N': '123'
}
}
},
'mealtime': {
'S': 'breakfast'
}
},
'ResponseMetadata': {
'HTTPHeaders': {
'connection': 'keep-alive',
'content-length': '223',
'content-type': 'application/x-amz-json-1.0',
'date': 'Mon, 23 Oct 2023 23:20:42 GMT',
'server': 'Server',
'x-amz-crc32': '3895319109',
'x-amzn-requestid': '7RVFJQ170IU2JEIGB6VFNN73R7VV4KQNSO5AEMVJF66Q9ASUAAJG'
},
'HTTPStatusCode': 400,
'RequestId': '7RVFJQ170IU2JEIGB6VFNN73R7VV4KQNSO5AEMVJF66Q9ASUAAJG',
'RetryAttempts': 0
}
}Note that we see, Error, Item, and ResponseMetadata.
Under moto3, we do not see Item:
{
'Error': {
'Code': 'ConditionalCheckFailedException',
'Message': 'The conditional request failed'
},
'ResponseMetadata': {
'HTTPHeaders': {
'content-type': 'application/json',
'x-amzn-errortype': 'ConditionalCheckFailedException'
},
'HTTPStatusCode': 400,
'RetryAttempts': 0
},
'message': 'The conditional request failed'
}
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