Tinkerpop3 doc example fails

[dmill-bz]

The following examples all fail or return a different output :

• [x] 1) Error

  g.V().values('age').fold(0) {a,b -> a + b}
  

  Solution : The typeChecker has no way of inferring what types a and b are, double? int? So we need to manually define them :

  g.V().values('age').fold(0) {Integer a, Integer b -> a + b}
  

• [ ] 2) Error. Once this is fixed I expect that it will not do anything just like tree() in 7) this will not serialize properly.

  g.V().hasLabel('person').outE().identity().inV().count().is(gt(5)).explain()
  

  Solution: For some reason the TypeChecker is not liking the fact that gt(5) has an Int rather than a Long :

  g.V().hasLabel('person').outE().identity().inV().count().is(gt(5L)).explain()
  

• [x] 3) Error. This fails because System is not available due to sandboxing. Might not fix this.

  g.V().sideEffect{println "first: ${it}"}.sideEffect{println "second: ${it}"}.iterate()
  

• [ ] 4) Wrong output.

  rand = new Random();
  g.withSack {rand.nextFloat()}.V().sack()
  

  Returns :

  ==>Script10$_run_closure1@449cbd0b
  ==>Script10$_run_closure1@449cbd0b
  ==>Script10$_run_closure1@449cbd0b
  ==>Script10$_run_closure1@449cbd0b
  ==>Script10$_run_closure1@449cbd0b
  ==>Script10$_run_closure1@449cbd0b
  

  But should be :

  ==>0.4141646
  ==>0.585294
  ==>0.0681594
  ==>0.9641305
  ==>0.7095289
  ==>0.33176965
  

• [ ] 5) Error

  g.withSack {[:]}{it.clone()}.V().out().out().
             sack {m,v -> m[v.value('name')] = v.value('lang'); m}.sack()
  

  Partial fix :

  g.withSack {[:]}{it.clone()}.V().out().out().
             sack {Map m, Vertex v -> m[v.value('name')] = v.value('lang'); m}.sack()
  

  Still throws error :

  Could not complete query: startup failed:
  Script10.groovy: 1: [Static type checking] - Cannot find matching method org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversalSource#withSack(groovy.lang.Closure, groovy.lang.Closure). Please check if the declared type is right and if the method exists.
  @ line 1, column 1.
    g.withSack {[:]}{it.clone()}.V().out().out().sack {Map m,Vertex  v -> m[v.value('name')] = v.value('lang'); m}.sack()
    ^
  
  1 error
  (Error 597)
  

• [ ] 6) Error

  g.V(1).repeat(local(
                bothE().sample(1).by('weight').otherV()
              )).times(5).path()
  

  Solution :

  g.V(1).repeat((GraphTravseral)local(
                bothE().sample(1).by('weight').otherV()
              )).times(5).path()
  

• [ ] 7) Nothing happens. This is due to the fact tat tree() doesn't serialize properly in GraphSON. (see https://issues.apache.org/jira/browse/TINKERPOP-732 )

  tree = g.V().out().out().tree().next()
  

• [ ] 8) Error

  g.V(1).out().fold().inject('gremlin',[1.23,2.34]).unfold()
  

• [ ] 9) Error

  inject(1,[2,3,[4,5,[6]]]).repeat(unfold()).until(count(local).is(1)).unfold()
  

  Solution :

  inject(1,[2,3,[4,5,[6]]]).repeat((GraphTraversal)unfold()).until(count(local).is(1)).unfold()
  

• [ ] 10) Error

  g.V().out().out().path()
    .by {it.value('name')}
    .by {it.value('name')}
    .by {g.V(it).in('created').values('name').fold().next()}
  

  Partial fix :

  g.V().out().out().path()
    .by {Vertex it -> it.value('name')}
    .by {Vertex it -> it.value('name')}
    .by {g.V(it).in('created').values('name').fold().next()}
  

  Still fails with :

  Could not complete query: startup failed:
  Script39.groovy: 1: [Static type checking] - Reference to method is ambiguous. Cannot choose between [org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversal <S, E> org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversal <S extends java.lang.Object, E extends java.lang.Object>#by(org.apache.tinkerpop.gremlin.process.traversal.Order), org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversal <S, E> org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversal <S extends java.lang.Object, E extends java.lang.Object>#by(java.util.Comparator <E>), org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversal <S, E> org.apache.tinkerpop.gremlin.process.traversal.dsl.graph.GraphTraversal <S extends java.lang.Object, E extends java.lang.Object>#by(java.util.function.Function <V, java.lang.Object>)]
  @ line 1, column 1.
    g.V().out().out().path().by {Vertex it -> it.value('name')}. by {Vertex it -> it.value('name')}. by {g.V(it).in('created').values('name').fold().next()}
    ^
  
  1 error
  (Error 597)
  

• [x] 11) Can't work because it's a ConsoleMutationListener

  gremlin> graph = TinkerFactory.createModern()
  ==>tinkergraph[vertices:6 edges:6]
  gremlin> l = new ConsoleMutationListener(graph)
  ==>MutationListener[tinkergraph[vertices:6 edges:6]]
  gremlin> strategy = EventStrategy.build().addListener(l).create()
  ==>EventStrategy
  gremlin> g = GraphTraversalSource.build().with(strategy).create(graph)
  ==>graphtraversalsource[tinkergraph[vertices:6 edges:6], standard]
  gremlin> g.addV('name','stephen')
  Vertex [v[12]] added to graph [tinkergraph[vertices:7 edges:6]]
  ==>v[12]
  gremlin> g.E().drop()
  Edge [e[7][1-knows->2]] removed from graph [tinkergraph[vertices:7 edges:6]]
  Edge [e[8][1-knows->4]] removed from graph [tinkergraph[vertices:7 edges:5]]
  Edge [e[9][1-created->3]] removed from graph [tinkergraph[vertices:7 edges:4]]
  Edge [e[10][4-created->5]] removed from graph [tinkergraph[vertices:7 edges:3]]
  Edge [e[11][4-created->3]] removed from graph [tinkergraph[vertices:7 edges:2]]
  Edge [e[12][6-created->3]] removed from graph [tinkergraph[vertices:7 edges:1]]
  

• [ ] 12) Error

  gremlin> graph = TinkerFactory.createModern()
  ==>tinkergraph[vertices:6 edges:6]
  gremlin> strategy = SubgraphStrategy.build().edgeCriterion(hasId(8,9,10)).create()
  ==>SubgraphStrategy
  gremlin> g = GraphTraversalSource.build().with(strategy).create(graph)
  ==>graphtraversalsource[tinkergraph[vertices:6 edges:6], standard]
  gremlin> g.V() // shows all vertices as no filter for vertices was specified
  ==>v[1]
  ==>v[2]
  ==>v[3]
  ==>v[4]
  ==>v[5]
  ==>v[6]
  gremlin> g.E() // shows only the edges defined in the edgeCriterion
  ==>e[8][1-knows->4]
  ==>e[9][1-created->3]
  ==>e[10][4-created->5]