https://github.com/magicmark/moto-issue-demo
https://github.com/magicmark/moto-issue-demo
Last synced: about 1 year ago
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- Host: GitHub
- URL: https://github.com/magicmark/moto-issue-demo
- Owner: magicmark
- Created: 2022-06-08T18:40:47.000Z (about 4 years ago)
- Default Branch: main
- Last Pushed: 2022-06-08T19:00:11.000Z (about 4 years ago)
- Last Synced: 2025-02-16T03:24:48.244Z (over 1 year ago)
- Language: Python
- Size: 16.6 KB
- Stars: 1
- Watchers: 3
- Forks: 1
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
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README
# moto-issue-demo
### Repro instructions
```bash
$ git clone https://github.com/magicmark/moto-issue-demo.git
$ cd moto-issue-demo
$ poetry install
$ poetry run pytest -vvv
```
### Output
```
try:
order_breakfast()
except BaseException as err:
> assert 'Item' in err.response["CancellationReasons"][0]
E AssertionError: assert 'Item' in {'Code': 'ConditionalCheckFailed', 'Message': 'The conditional request failed'}
tests/test_order_breakfast.py:40: AssertionError
============================================================= short test summary info =============================================================
FAILED tests/test_order_breakfast.py::test_breakfast_order - AssertionError: assert 'Item' in {'Code': 'ConditionalCheckFailed', 'Message': 'The...
================================================================ 1 failed in 0.67s ================================================================
```
### What's the problem?
With DynamoDB+boto3, when a transaction 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 `err.reason`:
```python
{'CancellationReasons': [{'Code': 'ConditionalCheckFailed',
'Item': {'customer': {'S': 'mark'},
'lock': {'M': {'acquired_at': {'N': '123'}}},
'mealtime': {'S': 'breakfast'}},
'Message': 'The conditional request failed'}],
'Error': {'Code': 'TransactionCanceledException',
'Message': 'Transaction cancelled, please refer cancellation '
'reasons for specific reasons [ConditionalCheckFailed]'},
'Message': 'Transaction cancelled, please refer cancellation reasons for '
'specific reasons [ConditionalCheckFailed]',
'ResponseMetadata': {'HTTPHeaders': {'connection': 'keep-alive',
'content-length': '393',
'content-type': 'application/x-amz-json-1.0',
'date': 'Wed, 08 Jun 2022 18:55:51 GMT',
'server': 'Server',
'x-amz-crc32': '947576560',
'x-amzn-requestid': 'BDBL292TOK52OSPP0GTJTTS2CVVV4KQNSO5AEMVJF66Q9ASUAAJG'},
'HTTPStatusCode': 400,
'RequestId': 'BDBL292TOK52OSPP0GTJTTS2CVVV4KQNSO5AEMVJF66Q9ASUAAJG',
'RetryAttempts': 0}}
```
Note that we see,`Code`, `Message`, and `Item`.
Under moto3, we do not see `Item`.