fluent API on table that has relation with itself - entity-framework

Question

I've created a table that has a relation with itself the table has a one-to-many relationship here is my Entity:
public class Permission
{
[Key]
public int PermissionId { get; set; }
public string PermissionTitle { get; set; }
public int? ParentId { get; set; }
#region Relations
[ForeignKey("ParentId")]
public virtual ICollection<Permission> Permissions { get; set; }
#endregion
}
but when I used migration to create the table in SQL, update-database failed for this error:
Introducing FOREIGN KEY constraint 'FK_Permission_Permission_ParentId' on table 'Permission' may cause cycles or multiple cascade paths. Specify ON DELETE NO ACTION or ON UPDATE NO ACTION, or modify other FOREIGN KEY constraints.
So I decided to use fluent API to solve this issue but I don't know how to Specify ON DELETE NO ACTION by Fluent API on a table that has a relation with itself. any help?
is there any solution to solve my problem?

Answer 1

For EF Core the Entity should normally have two Navigation Properties, like this:
public class Permission
{
[Key]
public int PermissionId { get; set; }
public string PermissionTitle { get; set; }
public int? ParentPermissionId { get; set; }
#region Relationships
public virtual Permission ParentPermission { get; set; }
public virtual ICollection<Permission> ChildPermissions { get; } = new HashSet<Permission>();
#endregion
}
And configured like this:
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
modelBuilder.Entity<Permission>()
.HasMany(p => p.ChildPermissions)
.WithOne(p => p.ParentPermission)
.HasForeignKey(p => p.ParentPermissionId)
.OnDelete(DeleteBehavior.Restrict);
base.OnModelCreating(modelBuilder);
}