David M. Brown created TINKERPOP-1875:
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Summary: Gremlin-Python only aggregates to list when using
GraphSON3
Key: TINKERPOP-1875
URL: https://issues.apache.org/jira/browse/TINKERPOP-1875
Project: TinkerPop
Issue Type: Bug
Components: python
Affects Versions: 3.3.1
Reporter: David M. Brown
Assignee: David M. Brown
Fix For: 3.3.2
Gremlin-Python fails to correctly extract the aggregate_to value from the
Gremlin Server response when using GraphSON3. I believe this is the source of
the test failures that were temporarily fixed by using the v2.0 message
serializer in [this
commit|https://github.com/apache/tinkerpop/commit/8c299879e777765748c2c2b03a58b6d0c5c401de].
In general, it seems this value is a bit buried in the new response message
format:
{code:json}
{'requestId': 'b2a51ad2-bca6-4493-9115-a57a92e477c7',
'result': {'data': {'@type': 'g:List',
'@value': [{'@type': 'g:Map',
'@value': ['ripple', {'@type': 'g:Int64', '@value': 1}]},
{'@type': 'g:Map', '@value': ['lop', {'@type': 'g:Int64', '@value': 3}]}]},
'meta': {'@type': 'g:Map',
'@value': ['aggregateTo', 'map', 'sideEffectKey', 'm']}},
'status': {'attributes': {'@type': 'g:Map', '@value': []},
'code': 200,
'message': ''}}
{code}
To access it, you have to do something like:
{code:python}
message['result']['meta']['@value'][1]
{code}
Which throws an error when no metadata is present. This seems a bit clumsy. I
haven't looked at how the Java driver deals with it, maybe there is a better
way to parse this.
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