abp ef Required one-to-many with shadow foreign key insert error

[842549829]

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Description

abp ef Required one-to-many with shadow foreign key insert error.
If the column below abp is not used, it can be inserted normally.

Error message:
The instance of entity type 'Course' cannot be tracked because another instance with the same key value for {'Id'} is already being tracked. When attaching existing entities, ensure that only one entity instance with a given key value is attached. Consider using 'DbContextOptionsBuilder.EnableSensitiveDataLogging' to see the conflicting key values.

Example:

builder.Entity<Course>(b =>
 {
       b.HasOne(x => x.Teacher).WithMany(t => t.Courses);
 });

public class Teacher : FullAuditedAggregateRoot<Guid>
 {
       public string Name { get; set; }

       public string Title { get; set; }

       public ICollection<Course> Courses { get; set; } = new List<Course>();
 }

public class Course : FullAuditedAggregateRoot<Guid>
    {
        public string Name { get; set; }

        public Teacher? Teacher { get; set; }
  }

Test:

 public class TeacherAppService : CrudAppService<
          Teacher, 
          TeacherDto, 
          Guid, 
          PagedAndSortedResultRequestDto, 
          CreateUpdateTeacherDto>
  {
      public TeacherAppService(IRepository<Teacher, Guid> repository) : base(repository)
      {
          Repository=repository;
      }

      public IRepository<Teacher, Guid> Repository { get; }

      public override async Task<TeacherDto> CreateAsync(CreateUpdateTeacherDto input)
      {
          var teacher = new Teacher
          {
              Name = "My Name",
              Title = "My Title"
          };
          var course1 = new Course { Name = "Course1" };
          var course2 = new Course { Name = "Course2" };
          teacher.Courses.Add(course1);
          teacher.Courses.Add(course2);
          await Repository.InsertAsync(teacher);
          return null;
      }
}

Reproduction Steps

No response

Expected behavior

No response

Actual behavior

No response

Regression?

No response

Known Workarounds

No response

Version

8.0

User Interface

Common (Default)

Database Provider

EF Core (Default)

Tiered or separate authentication server

Tiered

Operation System

Windows (Default)

Other information

No response

[mrh520]

try：

public class Teacher : FullAuditedAggregateRoot
{
public string Name { get; set; }

   public string Title { get; set; }

   [ForeignKey("TeacherId")]
   public ICollection<Course> Courses { get; set; } 

}

[842549829]

The Microsoft website documentation describes this configuration method as
Required one-to-many with shadow foreign key
https://learn.microsoft.com/en-us/ef/core/modeling/relationships/one-to-many#required-one-to-many-with-shadow-foreign-key

[mrh520]

public class TeacherAppService : CrudAppService<
     Teacher,
     TeacherDto,
     Guid,
     PagedAndSortedResultRequestDto,
     CreateUpdateTeacherDto>
{
    public TeacherAppService(IRepository<Teacher, Guid> repository) : base(repository)
    {
        Repository=repository;
    }

    public IRepository<Teacher, Guid> Repository { get; }

    public override async Task<TeacherDto> CreateAsync(CreateUpdateTeacherDto input)
    {
        var teacher = new Teacher
        {
            Name = "My Name",
            Title = "My Title"
        };
        var course1 = new Course { Name = "Course1",Id=Guid.NewGuid() };
        var course2 = new Course { Name = "Course2", Id=Guid.NewGuid() };
        teacher.Courses.Add(course1);
        teacher.Courses.Add(course2);
        await Repository.InsertAsync(teacher);
        return null;
    }
}

[842549829]

I don't understand what you mean

[mrh520]

Assign a value to the Id

[842549829]

I know assigning an Id will work but what I want is for the framework to generate the Id for me by default