Stuck on an issue?

Lightrun Answers was designed to reduce the constant googling that comes with debugging 3rd party libraries. It collects links to all the places you might be looking at while hunting down a tough bug.

And, if you’re still stuck at the end, we’re happy to hop on a call to see how we can help out.

Unable to query all hierarchy levels

See original GitHub issue

Steps to reproduce

public class Permission 
    {
        public Permission()
        {
            ChildPermissions = new HashSet<Permission>();
        }

        public int PermissionID { get; set; }
        public string PermissionName { get; set; }
        public int? ParentPermissionID { get; set; }
        public virtual Permission ParentPermission { get; set; }
        public virtual ICollection<Permission> ChildPermissions { get; }
    }

var permissionList = new Permission[] {
                new Permission
                {
                    PermissionID = 1,
                    PermissionName = "1"
                },
                new Permission
                {
                    PermissionID = 2,
                    PermissionName = "1.1",
                    ParentPermissionID = 1
                },
                new Permission
                {
                    PermissionID = 3,
                    PermissionName = "1.2",
                    ParentPermissionID = 1
                },
                new Permission
                {
                    PermissionID = 4,
                    PermissionName = "1.1.1",
                    ParentPermissionID = 2
                },
                new Permission
                {
                    PermissionID = 5,
                    PermissionName = "1.1.2",
                    ParentPermissionID = 2
                }
            };

 _Context.Permission.Include(x => x.ChildPermissions)
                                      .AsEnumerable()
                                      .Where(x => x.ParentPermissionID == null)
                                      .ToList();

The result doesn’t include third level “1.1.1” & “1.1.2” Generated query only shows left join

Further technical details

EF Core version: 3.0 Database provider: (e.g. Microsoft.EntityFrameworkCore.SqlServer) Target framework: (e.g. .NET Core 3.0) Operating system: IDE: (e.g. Visual Studio 2019 16.3)

Issue Analytics

State:
Created 4 years ago
Comments:5 (1 by maintainers)

Top GitHub Comments

2reactions

ajcvickerscommented, Oct 15, 2019

@NanFengCheong I am not able to reproduce this–see my code below. Please post a small, runnable project/solution or complete code listing, like below, that demonstrates the behavior you are seeing.

public class Permission
{
    public Permission()
    {
        ChildPermissions = new HashSet<Permission>();
    }

    [DatabaseGenerated(DatabaseGeneratedOption.None)]
    public int PermissionID { get; set; }
    public string PermissionName { get; set; }
    public int? ParentPermissionID { get; set; }
    public virtual Permission ParentPermission { get; set; }
    public virtual ICollection<Permission> ChildPermissions { get; }
}

public class BloggingContext : DbContext
{
    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
    {
        optionsBuilder
        .UseSqlServer(@"Server=(localdb)\mssqllocaldb;Database=Test;ConnectRetryCount=0");
    }

    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        modelBuilder.Entity<Permission>();
    }
}

public class Program
{
    public static void Main()
    {
        using (var context = new BloggingContext())
        {
            context.Database.EnsureDeleted();
            context.Database.EnsureCreated();

            var permissionList = new Permission[] {
                new Permission
                {
                    PermissionID = 1,
                    PermissionName = "1"
                },
                new Permission
                {
                    PermissionID = 2,
                    PermissionName = "1.1",
                    ParentPermissionID = 1
                },
                new Permission
                {
                    PermissionID = 3,
                    PermissionName = "1.2",
                    ParentPermissionID = 1
                },
                new Permission
                {
                    PermissionID = 4,
                    PermissionName = "1.1.1",
                    ParentPermissionID = 2
                },
                new Permission
                {
                    PermissionID = 5,
                    PermissionName = "1.1.2",
                    ParentPermissionID = 2
                }
            };
            
            context.AddRange(permissionList);

            context.SaveChanges();
        }

        using (var context = new BloggingContext())
        {
            var results = context.Set<Permission>()
                .Include(x => x.ChildPermissions)
                .AsEnumerable()
                .Where(x => x.ParentPermissionID == null)
                .ToList();
        }
    }
}

0reactions

NanFengCheongcommented, Oct 16, 2019

My bad. There is a library turn off following setting causing unexpected behavior.

context.ChangeTracker.AutoDetectChangesEnabled = false;
context.ChangeTracker.LazyLoadingEnabled = false;
context.ChangeTracker.QueryTrackingBehavior = QueryTrackingBehavior.NoTracking;