[BUG] TinkerPop tutorial commands not working in %%gremlin about graph-notebook HOT 5 CLOSED

Hi @adhalanay, thank you for submitting an issue!

%% gremlin graph = TinkerFactory.createModern() g = traversal().withEmbedded(graph)

Some initial clarification - the TinkerPop tutorial examples referenced are in Gremlin Groovy (Java-based) syntax. Groovy is just one of many Gremlin Language Variants available for use with TinkerPop. Graph-notebook is Python based, and therefore instead utilizes the Gremlin Python GLV, which may not work with certain Groovy commands/syntax.

When using the %%gremlin magic, it's not necessary to manually generate a traversal source, as this is handled under the covers by the Gremlin Python Client responsible for creating the websocket connection to Gremlin Server, as seen here. The traversal source is set to g by default, but if desired, you can change this via the gremlin -> traversal_source field in %%graph_notebook_config. Once you're happy with this configuration, you can start submitting queries directly via %%gremlin, or batch loading data using %seed.

I would recommend checking out our tutorial for setting up graph-notebook with Gremlin Server, which has additional instructions and considerations for initial setup: https://github.com/aws/graph-notebook/tree/main/additional-databases/gremlin-server.

from graph-notebook.

@michaelnchin Thank you for you reply. So if I understand correctly after instantiating a graph g is the corresponding traversal. But when I try a query like g.V() I get an empty reply instead of the six vertices.

As a side note a similar query works very good with JanusGraph.

from graph-notebook.

The new graph you're instantiating via the graph = TinkerFactory.createModern() command exists in memory, but is not assigned to or accessible via the traversal source g, due to the second command g = traversal().withEmbedded(graph) failing to run.

Since it hasn't been re-assigned to a different graph, g instead remains as the default traversal source for the empty default graph created by Gremlin Server - this empty graph is where your queries are currently being routed to.

TBH, the %%gremlin magic is only intended for running straight Gremlin queries. Other TinkerPop actions would be better executed via external means, like Gremlin Console, or even writing Gremlin Python code in the same Jupyter instance where you're using graph-notebook.

from graph-notebook.

So if I understand correctly one should use Gremlin Python instead of Gremlin Groovy. I think it is safe to close the bug now.

from graph-notebook.

Thanks @adhalanay - please feel free to re-open if you have additional questions 👍

from graph-notebook.