The Practitioner's Guide to Graph Data by Denise Gosnell

Author:Denise Gosnell
Language: eng
Format: epub
Publisher: O'Reilly Media
Published: 2020-03-19T00:00:00+00:00

Resolution: The where().by() pattern

If has("timestep", loops()) doesn’t work, why does the where().by() pattern work?

Let’s dig into why.

In Example 7-5, we used the following Gremlin pattern to create an edge filter:

where(eq("sendEdge")). by(loops()). by("timestep")

The basic form of where() in Gremlin is where(a, pred(b)). Our usage applies the shorthand of where(pred(b)), in which the incoming traverser is implicitly assigned to a.

Since the incoming traverser was labeled sendEdge, you actually have:

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