[QUESTION] three-levels tree

Hello!! I’m working with data structured in three levels

// all public and {get; set;}
class A {
  int Id;
  List<B> Bs;
}
class B {
  int Id;
  List<C> Cs;
}
class C {
  int Id;
  bool Happy;
}

BsonMapper.Global.Entity<C>().Id(x => x.Id, false);
BsonMapper.Global.Entity<B>().Id(x => x.Id, false).DbRef(x => x.Cs, "cs");
BsonMapper.Global.Entity<A>().Id(x => x.Id, false).DbRef(x => x.Bs, "bs");
db = new LiteDatabase($"Filename={dbPath};Password={password}", BsonMapper.Global);

a = new A {Id = 1};
b1 = new B {Id = 1};
b2 = new B {Id = 2};
c1 = new C {Id = 1};
c2 = new C {Id = 2};
c3 = new C {Id = 3};

a.Bs.Add(b1);
a.Bs.Add(b2);
b1.Cs.Add(c1);
b1.Cs.Add(c2);
b2.Cs.Add(c3);

var dba = db.GetCollection<A>().Add(a);
var res = dba.Include(x => x.Bs).FindAll().ToList();

Question 1: res will include all A and their children B… but how to include C too (they are contained in B.Cs) ? Question 2: if I use a configuration like Nodes and Archs, stored in 2 different collections, is it possible to investigate the graph in depth for n levels?

Thank you very much in advice 😉 bye!!!

[lbnascimento]

@dxmann Yes, you must manually insert all referenced documents.

It is possible to navigate through the documents, but you’ll need to use Bson Expressions. Here’s an example:

var colAs = db.GetCollection<A>("as").Include("$.Bs").Include("$.Bs[*].Cs");
var colBs = db.GetCollection<B>("bs").Include("$.Cs");
var colCs = db.GetCollection<C>("cs");

var r = colAs.Find("count($.Bs) > 0 and $.Bs[*].Cs[*].Happy all = true").ToList();
// returns all As for which Bs is not empty and all Cs in all Bs have Happy = true

[dxmann]

Ok, Thank you very much!! 😃