Loading multiple levels of nested navigation and collection properties with proxy disabled - azure

Question

I'm having a hard time figuring out how to do queries with levels of alternating collection and navigation properties with proxy and lazy loading disabled to serialize the result.
public ApplicationDbContext()
: base("Debug")
{
this.Configuration.LazyLoadingEnabled = false;
this.Configuration.ProxyCreationEnabled = false;
}
The entities look like this (omitting non-navigation or non-collections):
public class Comprobante: ComprobanteGeneric
{
}
public class ComprobanteGenericStructure
public int Id { get; set; }
[Required]
public virtual Conceptos Conceptos { get; set; }
}
public class Conceptos
{
public Conceptos()
{
Concepto = new List<Concepto>();
}
[ForeignKey("Comprobante")]
public int Id { get; set; }
[Required]
public virtual ICollection<Concepto> Concepto { get; set; }
public virtual Comprobante Comprobante { get; set; }
}
public class Concepto :RelatedComprobante
{
[Key]
public int Id { get; set; }
public virtual OrderOfImpuestosForConceptos Impuestos { get; set; }
public virtual Conceptos Conceptos { get; set; }
}
public class RelatedComprobante
{
[ForeignKey("Comprobante")]
public int ComprobanteId { get; set; }
public virtual Comprobante Comprobante { get; set; }
}
public class OrderOfImpuestosForConceptos : RelatedComprobante
{
public int Id { get; set; }
public virtual TrasladosNode Traslados { get; set; }
public virtual Retenciones Retenciones { get; set; }
}
public class TrasladosNode : RelatedComprobante
{
public TrasladosNode()
{
Traslado = new HashSet<Traslado>();
}
[Key]
public int Id { get; set; }
[Required]
public virtual ICollection<Traslado> Traslado { get; set; }
}
public class Traslado : RelatedComprobante
{
public int Id { get; set; }
public virtual TrasladosNode TrasladosNode { get; set; }
}
public class Retenciones : RelatedComprobante
{
public Retenciones()
{
Retencion = new List<Retencion>();
}
public int Id { get; set; }
[Required]
public virtual ICollection<Retencion> Retencion { get; set; }
}
public class Retencion : RelatedComprobante
{
public int Id { get; set; }
public virtual Retenciones Retenciones { get; set; }
}
I need the whole graph. With lazy loading enabled it returns it all eventually but serialization takes several seconds and several queries to DB. I disabled it and tried the following query:
comprobantes = _db.Comprobante
.Include(c => c.Conceptos.Concepto.Select(co => co.Impuestos.Retenciones).Select(r=>r.Retencion))
.Include(c => c.Conceptos.Concepto.Select(co => co.Impuestos.Traslados).Select(t => t.Traslado));
However I get an empty concepto list:
[{
"id": 324,
"conceptos": {
"concepto": []
}
},
{
"id": 340,
"conceptos": {
"concepto": []
}
}
}]
Even simpler queries like the following yield the exact same results:
comprobantes = _db.Comprobante
.Include(c => c.Conceptos.Concepto.Select(co => co.Impuestos));
I know is not the serialization for when I inspect the object while debugging is empty:
What am I doing wrong?

Answer 1

Thanks to David comment I was able to build a working query(es):
var comprobantes = _db.Comprobante
.Include(b => b.Conceptos.Concepto.Select(c => c.Impuestos.Retenciones.Retencion))
.Include(b => b.Conceptos.Concepto.Select(c => c.Impuestos.Traslados.Traslado));
foreach (var comprobante in comprobantes)
{
_db.ComprobanteTraslado.Where(t => t.ComprobanteId == comprobante.Id);
_db.ComprobanteRetencion.Where(r => r.ComprobanteId == comprobante.Id);
}