Question: How do you query/traverse graphs? about arangoclient.net HOT 11 CLOSED

public class Target
    {
        [DocumentProperty(Identifier = IdentifierType.Key)]
        public string Key;

        [DocumentProperty(Identifier = IdentifierType.Handle)]
        public string Id;

        public string Content;
    }

    public class TargetRelation
    {
        [DocumentProperty(Identifier = IdentifierType.Key)]
        public string Key;

        [DocumentProperty(Identifier = IdentifierType.EdgeFrom)]
        public string From;

        [DocumentProperty(Identifier = IdentifierType.EdgeTo)]
        public string To;
    }                


                var firstTarget = new Target { Content = "firstTarget" };
                var secondTarget = new Target { Content = "secondTarget" };
                var thirdTarget = new Target { Content = "thirdTarget" };

                db.Insert<Target>(firstTarget);
                db.Insert<Target>(secondTarget);
                db.Insert<Target>(thirdTarget);

                TargetRelation relationWithSecond = new TargetRelation();
                db.InsertEdge<TargetRelation>(firstTarget.Id, secondTarget.Id, relationWithSecond);

                TargetRelation relationWithThird = new TargetRelation();
                db.InsertEdge<TargetRelation>(firstTarget.Id, thirdTarget.Id, relationWithThird);


                var relations = db.Edges<TargetRelation>(firstTarget.Id, EdgeDirection.Outbound);

                var count = relations.Select(r => r.To).Except(new string[] { secondTarget.Id, thirdTarget.Id }).Count();

                Debug.Assert(count == 0);

var relationsCount = db.Query()
                    .For(_ => AQL.Edges<TargetRelation>(firstTarget.Id, EdgeDirection.Outbound)
                    .Where(r => AQL.In(r.To, new string[] { secondTarget.Id, thirdTarget.Id })))
                    .Count();

                // which translates to:
                // return length ((
                // for `r` in  edges(  `TargetRelation` , "Target/7433562403", 'outbound')
                // filter  `r`.`_to`  in  ["Target/7433759011", "Target/7433955619"]
                // return  `r` ))

                Debug.Assert(relationsCount == 2);

var firstTarget = new Target { Content = "firstTarget" };
                var secondTarget = new Target { Content = "secondTarget" };
                var thirdTarget = new Target { Content = "thirdTarget" };

                db.Insert<Target>(firstTarget);
                db.Insert<Target>(secondTarget);
                db.Insert<Target>(thirdTarget);

                TargetRelation firstWithSecond = new TargetRelation();
                db.InsertEdge<TargetRelation>(firstTarget.Id, secondTarget.Id, firstWithSecond);

                TargetRelation secondWithThird = new TargetRelation();
                db.InsertEdge<TargetRelation>(secondTarget.Id, thirdTarget.Id, secondWithThird);


                var vertexes = db.Query()
                    .For(_ => AQL.Traversal<Target, TargetRelation>(firstTarget.Id, EdgeDirection.Outbound))
                    .ToList();