Unable to use LTree type in the entity

I am using

"Npgsql.EntityFrameworkCore.PostgreSQL" Version="6.0.0-rc.1"
"Microsoft.EntityFrameworkCore.Tools" Version="6.0.0-rc.1.21452.10"

Here is my entity class

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Microsoft.EntityFrameworkCore;

namespace LtreePoc.Models
{
    public class Node
    {
        public Guid Id { get; set; }
        public LTree Path { get; set; }
        public string Name { get; set; }
    }
}

Here is the DB context class

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Microsoft.EntityFrameworkCore;
using LtreePoc.Models;

namespace LtreePoc
{
    public class NodeContext : DbContext
    {
        private const string PostgresConnectionString =
           "*****************Masked******************";

        public NodeContext()
        {

        }
        public NodeContext(DbContextOptions options)
            : base(options)
        {
        }

        public DbSet<Node> Nodes { get; set; }

        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
            modelBuilder.HasPostgresExtension("ltree");

        }

        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
        {
            optionsBuilder.UseNpgsql(PostgresConnectionString);
        }
    }
}

Here is my snippet trying to add a Node to my database.

     var node = new Node
      {
          Name = "xyz",
          Path = new LTree("a")
      };
      await _context.Nodes.AddAsync(node);
      _context.SaveChanges();

Here is the screen shot in VS 2022 … while debugging.

Here is the exception that is thrown

Microsoft.EntityFrameworkCore.DbUpdateException
  HResult=0x80131500
  Message=An error occurred while saving the entity changes. See the inner exception for details.
  Source=Microsoft.EntityFrameworkCore.Relational
  StackTrace:
   at Microsoft.EntityFrameworkCore.Update.ReaderModificationCommandBatch.Execute(IRelationalConnection connection)
   at Microsoft.EntityFrameworkCore.Update.Internal.BatchExecutor.Execute(IEnumerable`1 commandBatches, IRelationalConnection connection)
   at Microsoft.EntityFrameworkCore.Storage.RelationalDatabase.SaveChanges(IList`1 entries)
   at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.SaveChanges(IList`1 entriesToSave)
   at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.SaveChanges(StateManager stateManager, Boolean acceptAllChangesOnSuccess)
   at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.<>c.<SaveChanges>b__103_0(DbContext _, ValueTuple`2 t)
   at Npgsql.EntityFrameworkCore.PostgreSQL.Storage.Internal.NpgsqlExecutionStrategy.Execute[TState,TResult](TState state, Func`3 operation, Func`3 verifySucceeded)
   at Microsoft.EntityFrameworkCore.ChangeTracking.Internal.StateManager.SaveChanges(Boolean acceptAllChangesOnSuccess)
   at Microsoft.EntityFrameworkCore.DbContext.SaveChanges(Boolean acceptAllChangesOnSuccess)
   at Microsoft.EntityFrameworkCore.DbContext.SaveChanges()
   at LtreePoc.Program.<AddNode>d__5.MoveNext() in C:\_Nithin\Src\Play\efcore_ltree\LtreePoc\Program.cs:line 50
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at LtreePoc.Program.<Main>d__3.MoveNext() in C:\_Nithin\Src\Play\efcore_ltree\LtreePoc\Program.cs:line 27

  This exception was originally thrown at this call stack:
    [External Code]

Inner Exception 1:
PostgresException: 42883: no binary input function available for type ltree

I am struggling to understand the issue here. Unable to get any help online.

Please let me know where I am going wrong?

[roji]

You’re probably using a version of PostgreSQL older than 13; Npgsql relies on ltree binary support, which was added in 13 only. I’ll add a note in the docs.

[f2002642]

@roji Thank you.