EF Core self joined ICollection query - sql-server

Question

I have a problem with querying data from a self reference datatable having an ICollection.
Here are my table structures:
public class SoqHeading
{
public int Id { get; set; }
public string ItemNo { get; set; }
public string Heading { get; set; }
public SoqRevision SoqRevision_NP { get; set; }
public ICollection<SoqItem> Items { get; set; }
public int? ParentSoqHeadingId { get; set; }
public SoqHeading Parent_NP { get; set; }
public ICollection<SoqHeading> Children_NP { get; set; }
}
public class SoqItem
{
public int Id { get; set; }
public SoqPreliminaryOrContract_enum PreliminaryOrContract { get; set; }
public int SoqHeadingId { get; set; }
public SoqHeading SoqHeading_NP { get; set; }
}
I have a self referenced relation in the SoqHeading table which is 1 to many. The SoqHeading table can have zero or many SoqItems.
This is how the data is in my database
what i want is to query all from the root node of the SoqHeading table with its children and the items.
like this
{
"ItemNo": "C",
"Items": [
{
"ItemNo": "c-1",
},
{
"ItemNo": "c-2",
}
],
"Children_NP": [
{
"ItemNo": "C.1",
"Children_NP": [
{
"ItemNo": "C.1.1",
"Items": [
{
"ItemNo": "c.1.1-1",
},
{
"ItemNo": "c.1.1-2",
}
],
"Children_NP": [],
},
{
"ItemNo": "C.1.2",
"Items": [
{
"ItemNo": "c.1.2-1",
},
{
"ItemNo": "c.1.2-2",
}
],
"Children_NP": [],
}
],
},
{
"ItemNo": "C.2",
"Children_NP": [],
}
]
}
But currently i get data from the query like this
[
{
"ItemNo": "C"
},
{
"ItemNo": "C.1.2",
}
]
where C.1.2 has to be inside C, but it not. C and C.1.2 are in the same level which i dont wont to have produced by the following query
var entity = await _context.SoqHeadings
.Include(i=>i.Items)
.Include(i => i.Children_NP)
.Where(w => w.SoqRevision_NP.ProjectId == 10)
.ToListAsync();
please help

Answer 1

so it seems to be EFcore has no support to included the children on the first child node https://github.com/dotnet/efcore/issues/14144
so the work around is something like this here https://khalidabuhakmeh.com/recursive-data-with-entity-framework-core-and-sql-server