Tempt 2

TodoQuery.cs

namespace Wanderlust.API.Presentation.Queries;

using System;
using System.Threading;
using HotChocolate.Types.Pagination;

[ExtendObjectType(OperationTypeNames.Query)]
[GraphQLName(nameof(TodoQuery))]
public class TodoQuery
{
    [UsePaging]
    public ITodoResult GetTodos(string? after, int? first)
    {
        IEnumerable<Todo> todos = new List<Todo>()
        {
            new Todo() { Id = "1" },
            new Todo() { Id = "2" },
        };

        var edges = todos.Select(todo => new Edge<Todo>(todo, "1")).ToList();

        var pageInfo = new ConnectionPageInfo(false, false, null, null);

        var connection = new CustomConnection<Todo>(
            edges,
            pageInfo,
            ct => ValueTask.FromResult(0));

        var test = connection;

        return test;
    }

    public class CustomConnection<T> : Connection<T>, ITodoResult
        where T : Todo
    {
        public CustomConnection(IReadOnlyCollection<Edge<T>> edges, ConnectionPageInfo info, Func<CancellationToken, ValueTask<int>> getTotalCount)
            : base(edges, info, getTotalCount)
        {
        }
    }

    public class TodoError : ITodoResult
    {
        public string Message { get; set; } = "Error message here";
    }

    public class Todo
    {
        public string Id { get; set; } = default!;
    }

    [UnionType("TodoResult")]
    public interface ITodoResult
    {
    }
}