How should I proceed when I have an existing graph?

[Hatzman91]

Not actually an "Issue", but:

I already use a graph with the Gremlin, just with the standart GremllinServer and string query.

I tried to read my Vertexes with Gremlinq but it just doesn't find my pre-existing Vertexes.

When I Create a new one with the Gremlinq and then read it, it works perfectly.

What do I have to look out for, so the Gremlinq recognizes my objects?

[Daniel Weber]

Should usually work out of the box. What does a call to g.V() yield for you ?

[Hatzman91]

Ahhh

I got it now, I had a casesensitive problem with the Label, now i get what I want :)

[Hatzman91]

But with this I could use some help:
I want to re-create this query:

g.V('{userInput}') 
// Topic
.project('Id','Label','Message','DisplayText','ImageUrl','YesNoQuestion','GetGrandchildren','ChildTopics')                                                                 .by('id')
.by('label')
.by('message')
.by('displayText')
.by('imageUrl')
.by('yesNoQuestion')
.by('getGrandchildren')
.by(outE('parentOf')
    .project('Id','SortId','AnswerOption','Message','DisplayText','ImageUrl','ChildTopics')
    .by(inV().id())  
    .by('sortId')
    .by('answerOption')
    .by(inV().values('message'))
    .by(inV().values('displayText'))
    .by(inV().values('imageUrl'))
    .by(inV().outE()
        .project('Id','SortId','AnswerOption','Message','DisplayText','ImageUrl')
        .by(inV().id())
        .by('sortId')
        .by('answerOption')
        .by(inV().values('message'))
        .by(inV().values('displayText'))
        .by(inV().values('imageUrl'))
        .fold())
    .fold())

I have 2 Objects which look like this:

Topic:
public string Id { get; set; }
public string Message { get; set; }
public string DisplayText { get; set; }
public List ChildTopics { get; set; }
public string ImageUrl { get; set; }
public bool YesNoQuestion { get; set; }
public bool GetGrandchildren { get; set; }

And

ChildTopic
public string Id { get; set; }
public string Message { get; set; }
public string DisplayText { get; set; }
public List ChildTopics { get; set; }
public string AnswerOption { get; set; }
public string ImageUrl { get; set; }
public int SortId { get; set; }

And in the Graph i have "Topic" Verteces which are Connected as "ParentOf" with properties

ParentOf:
public string AnswerOption { get; set; }
public int SortId { get; set; }

I want to get 1 selected Topic and all of its children, and it's childrens-children

any help how to project these connections in my objects would be appreciated :)

[Daniel Weber]

The support for project in Gremlinq is currently limited to projecting to ValueTuples only, i.e. project in Gremlinq won't give you any POCOs.

[Daniel Weber]

Please rework your query to be a bit more readable, and maybe trim it down, I might be able to give you some working Gremlinq query that you can use to go from there.

[Hatzman91]

I updated my comment

I think when I somehow could get a touple with ParentTopic-Vertex, ParentOf-Edge and ChildTopic-Vertex I could work very well with that

[Daniel Weber]

What about something like

g
    .V(userInput)
    .OfType<ParentTopic>()
    .OutE<ParentOf>()
    .Where(_ => _.InV().OfType<ChildTopic>())
    .Project(
        _ => _.OutV(),
        _ => _,
        _ => _.InV().OfType<ChildTopic>())

Would that work ?

[Daniel Weber]

Or to get a nicer structure with less redundancy:

g
    .V(userInput)
    .OfType<ParentTopic>()
    .Project(
        _ => _
        _ => _
            .OutE<ParentOf>()
            .Where(_ => _.InV().OfType<ChildTopic>())
            .Project(
                _ => _,
                _ => _..InV().OfType<ChildTopic>())
            .Fold())

[Hatzman91]

Thank you very much, got it working with the second call!