Error: introducing FOREIGN KEY constraint may cause cycles or multiple cascade paths

Question

高手的快速提问。

我得到了 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中创建一对多关系。

但是当我尝试这样做时，出现了这个错误：

Introducing FOREIGN KEY constraint 'FK_dbo.Teachers_dbo.Schools_SchoolId' on table 'Teachers' may cause cycles or multiple cascade paths. Specify ON DELETE NO ACTION or ON UPDATE NO ACTION, or modify other FOREIGN KEY constraints.

我哪里做错了？

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; }
    }

我没有收到此模型和密钥的任何错误..

Answer 1

删除 Note 与 School 的关系，反之亦然。可以找跟笔记有关系的老师找学校

它会产生你的问题。

Error: introducing FOREIGN KEY constraint may cause cycles or multiple cascade paths

Error: introducing FOREIGN KEY constraint may cause cycles or multiple cascade paths

c#

asp.net-mvc

entity-framework

ef-code-first