In Gremlin, how can I group pairs of elements by a property from one of them?
After some traversal I select the elements I'm interested in through select(). How can I group by one of the properties from one specific element.
What I did:
g.V() // ... some traversal happens here where I obtain a and b
select('a','b').by(valueMap('Name', 'Description', 'Label'))
Right now this gets me all the data I'm interested in, something like:
[
{
"a": { "Name": "A name" ... },
"b": { "Name": "other name" ... },
}
...
]
But I know that b.Name repeats among different pairs of a,b, and so I would like to group all the a elements under their common b element, I think this should be easy to do, but so far I'm unable to do it.
azure-cosmosdb gremlin asked Nov 16 '18 at 0:44
GalmWingGalmWing
606613
add a comment |
After some traversal I select the elements I'm interested in through select(). How can I group by one of the properties from one specific element.
What I did:
g.V() // ... some traversal happens here where I obtain a and b
select('a','b').by(valueMap('Name', 'Description', 'Label'))
Right now this gets me all the data I'm interested in, something like:
[
{
"a": { "Name": "A name" ... },
"b": { "Name": "other name" ... },
}
...
]
But I know that b.Name repeats among different pairs of a,b, and so I would like to group all the a elements under their common b element, I think this should be easy to do, but so far I'm unable to do it.
azure-cosmosdb gremlin asked Nov 16 '18 at 0:44
GalmWingGalmWing
606613
add a comment |
After some traversal I select the elements I'm interested in through select(). How can I group by one of the properties from one specific element.
What I did:
g.V() // ... some traversal happens here where I obtain a and b
select('a','b').by(valueMap('Name', 'Description', 'Label'))
Right now this gets me all the data I'm interested in, something like:
[
{
"a": { "Name": "A name" ... },
"b": { "Name": "other name" ... },
}
...
]
But I know that b.Name repeats among different pairs of a,b, and so I would like to group all the a elements under their common b element, I think this should be easy to do, but so far I'm unable to do it.
azure-cosmosdb gremlin asked Nov 16 '18 at 0:44
GalmWingGalmWing
606613
After some traversal I select the elements I'm interested in through select(). How can I group by one of the properties from one specific element.
What I did:
g.V() // ... some traversal happens here where I obtain a and b
select('a','b').by(valueMap('Name', 'Description', 'Label'))
Right now this gets me all the data I'm interested in, something like:
[
{
"a": { "Name": "A name" ... },
"b": { "Name": "other name" ... },
}
...
]
But I know that b.Name repeats among different pairs of a,b, and so I would like to group all the a elements under their common b element, I think this should be easy to do, but so far I'm unable to do it.
azure-cosmosdb gremlin azure-cosmosdb gremlin asked Nov 16 '18 at 0:44
GalmWingGalmWing
606613
asked Nov 16 '18 at 0:44
GalmWingGalmWing
606613
asked Nov 16 '18 at 0:44
GalmWingGalmWing
606613
asked Nov 16 '18 at 0:44
GalmWingGalmWing
606613
asked Nov 16 '18 at 0:44
GalmWingGalmWing
606613
606613
add a comment |
add a comment |
1 Answer
1
active
oldest
votes
It's probably better to rewrite the whole traversal, but since you kept it as a secret, here's how you would do the post-grouping:
g.V()...
select('a','b').
by(valueMap('Name', 'Description', 'Label')).
group().
by(select('b')).
by(select('a').fold())
answered Nov 16 '18 at 15:08
Daniel KuppitzDaniel Kuppitz
7,35911427
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
It's probably better to rewrite the whole traversal, but since you kept it as a secret, here's how you would do the post-grouping:
g.V()...
select('a','b').
by(valueMap('Name', 'Description', 'Label')).
group().
by(select('b')).
by(select('a').fold())
answered Nov 16 '18 at 15:08
Daniel KuppitzDaniel Kuppitz
7,35911427
add a comment |
It's probably better to rewrite the whole traversal, but since you kept it as a secret, here's how you would do the post-grouping:
g.V()...
select('a','b').
by(valueMap('Name', 'Description', 'Label')).
group().
by(select('b')).
by(select('a').fold())
answered Nov 16 '18 at 15:08
Daniel KuppitzDaniel Kuppitz
7,35911427
add a comment |
It's probably better to rewrite the whole traversal, but since you kept it as a secret, here's how you would do the post-grouping:
g.V()...
select('a','b').
by(valueMap('Name', 'Description', 'Label')).
group().
by(select('b')).
by(select('a').fold())
answered Nov 16 '18 at 15:08
Daniel KuppitzDaniel Kuppitz
7,35911427
It's probably better to rewrite the whole traversal, but since you kept it as a secret, here's how you would do the post-grouping:
g.V()...
select('a','b').
by(valueMap('Name', 'Description', 'Label')).
group().
by(select('b')).
by(select('a').fold())
answered Nov 16 '18 at 15:08
Daniel KuppitzDaniel Kuppitz
7,35911427
answered Nov 16 '18 at 15:08
Daniel KuppitzDaniel Kuppitz
7,35911427
answered Nov 16 '18 at 15:08
Daniel KuppitzDaniel Kuppitz
7,35911427
answered Nov 16 '18 at 15:08
Daniel KuppitzDaniel Kuppitz
7,35911427
7,35911427
add a comment |
add a comment |
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