Gremlin:如何返回顶点及其关联的顶点? [英] Gremlin: how can I return vertex and their associated vertex?

问题描述

我需要返回一些团体和该团体中的人，像这样:

I Need to return some groups and people in that group, like this:

Group A
-----Person A
-----Person B
-----Person C

Group B
-----Person D
-----Person E
-----Person F

我要如何用gremlin做到这一点.它们通过边缘连接在一起.

How can I do that with gremlin. They are connected to group with a edge.

推荐答案

最好在样本中包含有关Gremlin的问题的示例图，最好将其作为以下内容轻松粘贴到Gremlin控制台中，如下所示:

It is always helpful to include a sample graph with your questions on Gremlin preferably as a something easily pasted to the Gremlin Console as follows:

g.addV('group').property('name','Group A').as('ga').
  addV('group').property('name','Group B').as('gb').
  addV('person').property('name','Person A').as('pa').
  addV('person').property('name','Person B').as('pb').
  addV('person').property('name','Person C').as('pc').
  addV('person').property('name','Person D').as('pd').
  addV('person').property('name','Person E').as('pe').
  addV('person').property('name','Person F').as('pf').
  addE('contains').from('ga').to('pa').
  addE('contains').from('ga').to('pb').
  addE('contains').from('ga').to('pc').
  addE('contains').from('gb').to('pd').
  addE('contains').from('gb').to('pe').
  addE('contains').from('gb').to('pf').iterate()

您的问题的解决方案是使用group()步骤:

A solution to your problem is to use group() step:

gremlin> g.V().has('group', 'name', within('Group A','Group B')).
......1>   group().
......2>     by('name').
......3>     by(out('contains').values('name').fold())
==>[Group B:[Person D,Person E,Person F],Group A:[Person A,Person B,Person C]]

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