[Table("School")]

public partial class School

{

    public School()

    {

        Students = new List<Student>();

        Teachers = new List<Teacher>();

    }

    [Key]

    public string SchoolId { get; set; }

    public string Name { get; set; }

    public virtual ICollection<Student> Students { get; set; }

    public virtual ICollection<Teacher> Teachers { get; set; }

}

[Table("Student")]

public partial class Student

{

    public Student()

    {

        Teachers = new List<Teacher>();

    }

    [Key]

    public string StudentId { get; set; }

    public string Name { get; set; }

    public string PhoneId { get; set; }

    public string SchoolId { get; set; }

    public virtual School School { get; set; }

    public ICollection<Teacher> Teachers { get; set; }

}

[Table("Teacher")]

public class Teacher

{

    public Teacher()

    {

        Students = new List<Student>();

    }

    [Key]

    public string TeacherId { get; set; }

    public string Name { get; set; }

    public string PhoneId { get; set; }

    public string SchoolId { get; set; }

    public virtual School School { get; set; }

    public virtual ICollection<Student> Students { get; set; }

}

modelBuilder.Entity<Student>()

    .HasRequired(a => a.School)

    .WithMany(a => a.Students)

    .HasForeignKey(a=>a.StudentId);

modelBuilder.Entity<Teacher>()

    .HasRequired(a => a.School)

    .WithMany(a => a.Teachers)

    .HasForeignKey(a => a.TeacherId);

modelBuilder.Entity<Teacher>()

    .HasMany(a => a.Students)

    .WithMany(a => a.Teachers)

    .Map

    (

        a =>

        {

            a.MapLeftKey("TeacherId");

            a.MapRightKey("StudentId");

            a.ToTable("Teacher_Student");

        }

    );