EF Core - hierarchy using Composite Design Pattern and CTE - entity-framework-core

Question

I want to create a catalog products. There may be catalogs or products on each node.
I decided to use the composite design pattern.
I will download the node with the children using CTE. Unfortunately there was a problem, because EF Core doesn't add parentId in the CategoryProducts table.
Additionally the class (Category as my Composite) has its own CategoryDetails class, (Product as my Leaf) has its own ProductDetails class.
How do I configure EF Core to recursively get nodes from the tree?
Is CTE a good idea?
public enum CategoryProductType
{
Category,
Product
}
public abstract class CategoryProduct
{
public Guid Id { get; private set; }
public string Name { get; private set; }
public CategoryProductType Type { get; private set; }
protected CategoryProduct(Guid id, string name, CategoryProductType type)
{
Id = id;
Name = name;
Type = type;
}
}
public class Category : CategoryProduct
{
public string Code { get; private set; }
public CategoryDetails CategoryDetails { get; private set; }
private ICollection<CategoryProduct> _children { get; set; } = new Collection<CategoryProduct>();
public IEnumerable<CategoryProduct> Children => _children;
public Category(Guid id, string name, string code)
: base(id, name, CategoryProductType.Category)
{
Code = code;
}
}
public class CategoryDetails
{
public Guid CategoryId { get; private set; }
public Category Category { get; private set; }
public string Description { get; private set; }
private CategoryDetails() { }
public CategoryDetails(Category category, string description)
{
Category = category);
Description = description);
}
}
public class Product : CategoryProduct
{
public string Index { get; private set; }
public ProductDetails ProductDetails { get; private set; }
public Product(Guid id, string name, string index)
: base(id, name, CategoryProductType.Product)
{
SetIndex(index);
}
}
EF Core Setting:

Answer 1

Unfortunately I don't know anything about CTE Recursion.
However, this is an example on how I modeled a hierarchical structure (i.e. a tree) with EF Core, hopefully it can help you.
public class TreeNode
{
public int TreeNodeId { get; private set; }
public int? ParentTreeNodeId { get; set; }
public TreeNode ParentTreeNode { get; set; }
public List<TreeNode> ChildrenTreeNodes { get; set; }
}
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
modelBuilder.Entity<TreeNode>(entity =>
{
entity.HasOne(n => n.ParentTreeNode)
.WithMany(n => n.ChildrenTreeNodes)
.HasForeignKey(n => n.ParentTreeNodeId);
});
}