missing steps

[WolfgangFahl]

implement the following steps:

• fold
• unfold
• valueMap
• elementMap properly

the live demo notebook and a commented out test also show an issue with

• has_property

  
  ---------------------------------------------------------------------------
  AttributeError                            Traceback (most recent call last)
  Cell In[11], line 1
  ----> 1 g.V().has_label('airport').has_property("city", "Maastricht").as_('start')\
    2     .repeat(
    3         outE('route').as_('e')\
    4         .inV().filter_(
    5             select('e').properties('dist').is_(lte(2000))
    6         ).simple_path()
    7     ).times(3).emit().as_('dest')\
    8     .path().as_('p')\
    9     .count(Scope.local).order(asc=True).as_('length')\
   10     .select('dest').dedup()\
   11     .select('dest', 'length').to_list().by('city').run()

AttributeError: 'Traversal' object has no attribute 'has_property'

[juupje]

Working on this in the steps branch.

[juupje]

The issue with has_property stems from an outdated query. As the properties key in the NetworkX dictionary is no more, you should now use the has step instead (which is how it is done in Gremlin). The query

g.V()
    .has_label("airport")
    .has("city", "Maastricht")
    .as_("start")
    .repeat(
        outE("route")
        .as_("e")
        .inV()
        .filter_(select("e").values("dist").is_(lte(2000)))
        .simple_path()
    )
    .times(3)
    .emit()
    .as_("dest")
    .path()
    .as_("p")
    .count(Scope.local)
    .order(Order.asc)
    .as_("length")
    .dedup()
    .select("dest", "length")
    .to_list()
    .by("city")

should now work