[jira] [Closed] (TINKERPOP-2599) Issue with the behavior of the coalesce method on the last few versions of gremlinpython

["Stephen Mallette (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/TINKERPOP-2599?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Stephen Mallette closed TINKERPOP-2599.
---------------------------------------
    Fix Version/s:     (was: 3.4.9)
       Resolution: Not A Bug

In 3.5.0 child traversals must be anonymous:

https://tinkerpop.apache.org/docs/3.5.1/upgrade/#_anonymous_child_traversals

in other words, you can't spawn them with your "g".

> Issue with the behavior of the coalesce method on the last few versions of gremlinpython
> ----------------------------------------------------------------------------------------
>
>                 Key: TINKERPOP-2599
>                 URL: https://issues.apache.org/jira/browse/TINKERPOP-2599
>             Project: TinkerPop
>          Issue Type: Bug
>          Components: python
>    Affects Versions: 3.4.10, 3.4.11, 3.5.1
>            Reporter: Gaxinto Theodorio
>            Priority: Major
>
> There's an issue with the functionality of the coalesce method in gremlin python. If you were to run the code below in version 3.4.9, you will find that the code works perfectly.
>  
> {code:java}
> import os
> from gremlin_python import statics, structure
> from gremlin_python.process import graph_traversal
> from gremlin_python.structure.graph import Graph
> from gremlin_python.process.graph_traversal import __
> from gremlin_python.process.strategies import *
> from gremlin_python.driver.driver_remote_connection import DriverRemoteConnection
> from gremlin_python.process.traversal import T, within, 
> Cardinalitygremlin_enpoint = "ws://localhost:8182/gremlin"
> graph = Graph()
> remoteConn = DriverRemoteConnection(gremlin_enpoint, "g")
> g = graph.traversal().withRemote(remoteConn)
> response = (
>             g.V()
>             .fold()
>             .coalesce(  # if exists update and get
>                 g.V("mark"),
>                 # if not exist then create
>                 g.addV("Person").property(Cardinality.single, T.id, "mark")
>             )
>             .next()
>         )
> print(response)
> {code}
> However, run the same exact code in the latest version and you will be greeted by the following error
>  
> {code:java}
> Traceback (most recent call last):
>   File "<redacted>/playground/scripts/test_coalesce.py", line 18, in <module>
>     g.V("test")
>   File "<redacted>/playground-zEQSuka0/lib/python3.9/site-packages/gremlin_python/process/graph_traversal.py", line 217, in coalesce
>     self.bytecode.add_step("coalesce", *args)
>   File "<redacted>/playground-zEQSuka0/lib/python3.9/site-packages/gremlin_python/process/traversal.py", line 603, in add_step
>     instruction.append(self.__convertArgument(arg))
>   File "<redacted>/playground-zEQSuka0/lib/python3.9/site-packages/gremlin_python/process/traversal.py", line 629, in __convertArgument
>     raise TypeError("The child traversal of " + arg + " was not spawned anonymously - use the __ class rather than a TraversalSource to construct the child traversal")
> TypeError: can only concatenate str (not "GraphTraversal") to str
> {code}



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