错误：引入FOREIGN KEY约束可能会导致循环或多个级联路径

Question

主人的快速问题。

我有2个EF模型类：

public class School
{
        public int Id { get; set; }
        [DisplayName("School")]
        public string Name { get; set; }

        public List<Teacher> Teachers { get; set; }
        public List<Note> Notes { get; set; }
}

public class Teacher
{
    public int Id { get; set; }
    [DisplayName("Öğretmen")]
    public string Name { get; set; }
    public int SchoolId { get; set; }

    public School School { get; set; }
    public List<Note> Notes { get; set; }
}

基本上我想在代码优先创建一对多的关系。

但是当我尝试这样做时，我收到了这个错误：

在'教师'表上引入FOREIGN KEY约束'FK_dbo.Teachers_dbo.Schools_SchoolId'可能会导致循环或多个级联路径。指定ON DELETE NO ACTION或ON UPDATE NO ACTION，或修改其他FOREIGN KEY约束。

我哪里弄错了？

编辑

  public class Note
    {
        public int Id { get; set; }
        [Required,DisplayName("Başlık"), StringLength(50)]
        public string Title { get; set; }
        [Required,DisplayName("Açıklama"), StringLength(4000)]
        public string Description { get; set; }
        public string File { get; set; }
        public DateTime UploadDate { get; set; }
        public bool IsApproved { get; set; }
        public int SchoolId { get; set; }
        public int OwnerId { get; set; }
        public int TeacherId { get; set; }


        //Keys

        public School School { get; set; }
        public Teacher Teacher { get; set; }
        public List<Comment> Comments { get; set; }
    }

我没有得到这个模型和键的任何错误..

Answer 1

删除从Note到School的关系，反之亦然。你可以通过与笔记有关系的老师来学校。

它会产生你的问题。