can we relate a property with other property of same vertex

问题

A sample vertex

g.addV('a').property('vehicle','v1').property('time',1000).property(list,'vehicle','v2').property(list,'time',830)

how can we map the values in property 'vehicle' to the values in property 'time'. I tired the following code

g.V(1).hasKey('vehicle').map(hasKey('time'))

To find path I tired following code

g.V().hasLabel('a').repeat(out().simplePath()).until(hasLabel('h')).path().by(union(label(),values('vehicle','time')).fold())

can you help me please

回答1:

Changing the data model makes these kinds of queries easier to write. If you use vertices and edges to model the vehicles and times instead of lists stored as properties then you can do something like this.

g.addV('A').as('a').
  addV('B').as('b').
  addV('C').as('c').
  addV('vehicle').as('v1').property('time',10).property('name','V1').
  addV('vehicle').as('v2').property('time',8).property('name','V2').
  addV('vehicle').as('v3').property('time',5).property('name','V3').
  addV('vehicle').as('v4').property('time',6).property('name','V4').
  addV('vehicle').as('v5').property('time',5).property('name','V5').
  addV('vehicle').as('v6').property('time',6).property('name','V6').
  addE('route').from('a').to('b').
  addE('route').from('b').to('c').
  addE('vehicle_info').from('a').to('v1').
  addE('vehicle_info').from('a').to('v2').
  addE('vehicle_info').from('b').to('v3').
  addE('vehicle_info').from('b').to('v4').
  addE('vehicle_info').from('c').to('v5').
  addE('vehicle_info').from('c').to('v6').
  iterate()

gremlin> g.V().hasLabel('A').
......1>   repeat(out('route').simplePath()).
......2>     until(hasLabel('C')).
......3>   path().
......4>     by(union(label(),out('vehicle_info').values('name','time').fold()).fold())

==>[[A,[V1,10,V2,8]],[B,[V3,5,V4,6]],[C,[V5,5,V6,6]]]

EDITED to add:

You can filter by the time as follows:

gremlin> g.V().hasLabel('A').
......1>   repeat(out('route').simplePath()).
......2>     until(hasLabel('C')).
......3>   path().
......4>     by(union(label(),out('vehicle_info').has('time',between(5,10)).values('name','time').fold())
.fold()) 
==>[[A,[V2,8]],[B,[V3,5,V4,6]],[C,[V5,5,V6,6]]]

回答2:

This can be accomplished like this:

g.V(18).property('time', __.values('vehicle'))

Which will map the list property like this:

gremlin> g.addV('a').property('vehicle','v1').property('time',1000).property(list,'vehicle','v2').property(list,'time',830)
==>v[18]
gremlin> g.V(18).valueMap()
==>[time:[1000,830],vehicle:[v1,v2]]
gremlin> g.V(18).property(list, 'time', __.values('vehicle'))
==>v[18]
gremlin> g.V(18).valueMap()
==>[time:[v1,v1],vehicle:[v1,v2]]

来源：https://stackoverflow.com/questions/62465145/can-we-relate-a-property-with-other-property-of-same-vertex

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