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I tried to use filter to get all vertices which has at least one neighbour in gremlin, but get error, did I mis-use filter function? Thanks

g.V().hasLabel("Customer", "Loan", "Account", "CreditCard").filter(both().hasNext())

I tried to use filter to get all vertices which has at least one neighbour in gremlin, but get error, did I mis-use filter function? Thanks

g.V().hasLabel("Customer", "Loan", "Account", "CreditCard").filter(both().hasNext())
  • gremlin
  • tinkerpop
  • janusgraph
Share Improve this question asked Nov 18, 2024 at 14:01 zjffduzjffdu 29.2k51 gold badges121 silver badges171 bronze badges
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1 Answer 1

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hasNext() is a terminal step. It is only meant to be used at the end of a query, not within the query: https://tinkerpop.apache./docs/current/reference/#terminal-steps

You can achieve what you're looking for by doing something like:

g.V().hasLabel("Customer", "Loan", "Account","CreditCard").
    where(bothE().count().is(gt(0)))

If issuing this using one of the Gremlin clients, you'll need to end this with next(), toList() or some other Terminal step to send the query to your database and fetch a result.

If you're looking for a good resource to use in learning Gremlin, I highly suggest looking at: https://www.kelvinlawrence/book/PracticalGremlin.html

I tried to use filter to get all vertices which has at least one neighbour in gremlin, but get error, did I mis-use filter function? Thanks

g.V().hasLabel("Customer", "Loan", "Account", "CreditCard").filter(both().hasNext())

I tried to use filter to get all vertices which has at least one neighbour in gremlin, but get error, did I mis-use filter function? Thanks

g.V().hasLabel("Customer", "Loan", "Account", "CreditCard").filter(both().hasNext())
  • gremlin
  • tinkerpop
  • janusgraph
Share Improve this question asked Nov 18, 2024 at 14:01 zjffduzjffdu 29.2k51 gold badges121 silver badges171 bronze badges
Add a comment  | 

1 Answer 1

Reset to default 0

hasNext() is a terminal step. It is only meant to be used at the end of a query, not within the query: https://tinkerpop.apache./docs/current/reference/#terminal-steps

You can achieve what you're looking for by doing something like:

g.V().hasLabel("Customer", "Loan", "Account","CreditCard").
    where(bothE().count().is(gt(0)))

If issuing this using one of the Gremlin clients, you'll need to end this with next(), toList() or some other Terminal step to send the query to your database and fetch a result.

If you're looking for a good resource to use in learning Gremlin, I highly suggest looking at: https://www.kelvinlawrence/book/PracticalGremlin.html

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