public RelationSet From(RelationDescription relationDescription)
{
if (nodeSets.Count != relationSets.Count + 1)
{
throw new Exception("To/From must be executed after Match");
}
var lastNodeLayer = nodeSets.Last().Nodes;
var goodRelations = new RelationSet(RelationsDirection.Left);
foreach (var node in lastNodeLayer)
{
node.PullInRelations();
foreach (var inRelation in node.InRelations)
{
if (relationDescription.CheckRelation(inRelation))
{
goodRelations.Relations.Add(inRelation);
}
}
}
relationSets.Add(goodRelations);
return(goodRelations);
}
private static void Main(string[] args)
{
using (var engine = new DbEngine())
{
// engine.DropDatabase();
Node user1 = engine.AddNode("user");
user1["age"] = 19;
Node user2 = engine.AddNode("user");
user2["age"] = 20;
var relation1 = engine.AddRelation(user1, user2, "knows");
relation1["some_property"] = "zzz";
engine.SaveChanges();
var query = new Query(engine);
var firstNodeDescription = new NodeDescription(
"user",
new Dictionary <string, object>
{
{ "age", 19 }
}
);
var relationDescription = new RelationDescription(
"knows",
new Dictionary <string, object>
{
{ "some_property", "zzz" }
}
);
var a = query.Match(firstNodeDescription);
var x = query.To(relationDescription);
var b = query.Match(NodeDescription.Any());
query.Execute();
Console.WriteLine(a.Nodes.First()["age"]);
Console.WriteLine(x.Relations.First()["some_property"]);
Console.WriteLine(b.Nodes.First()["age"]);
Console.ReadLine();
engine.DropDatabase();
}
}