实体框架一对多，只有一个导航属性：WithRequiredDependant？

Question

使用最新的实体框架，我有一个一对多的类，在多方面只有一个导航属性。

如MSDN 中所述：Entity Framework Fluent API - Relationships：

单向（也称为单向）关系是指仅在关系的一个端点上而不是在两个端点上定义导航属性。

简化：aSchool有很多Students；School 和 Student 之间存在一对多关系，但 School 没有包含学生集合的属性

class Student
{
    public int Id {get; set;}
    // a Student attends one School; foreign key SchoolId
    public int SchoolId {get; set;}
    public School School {get; set;}
}

class School
{
    public int Id {get; set;}
    // missing: public virtual ICollection<Studen> Students {get; set;}
}

在双向关系中，您可以在 中编写以下流畅的 API OnModelCreating：

protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
    modelBuilder.Entity<Student>()
        .HasRequired(student => student.School)
        .WithMany(school => school.Students)
        .HasForeignKey(student => student.SchoolId);
}

由于缺少School.Students，我需要做一些额外的事情。根据开头的链接，我似乎必须对WithRequiredDependant.

// Summary:
//     Configures the relationship to be required without a navigation property
//     on the other side of the relationship. The entity type being configured will
//     be the dependent and contain a foreign key to the principal. The entity type
//     that the relationship targets will be the principal in the relationship.
//
public ForeignKeyNavigationPropertyConfiguration WithRequiredDependent();

modelBuilder.Entity<Student>()
    .HasRequired(student => student.School)
    .WithRequiredDependent();

唉，这行不通。SchoolId 未建模为外键。

我需要什么流畅的 API？

Answer 1

我希望我有正确的版本/版本：

modelBuilder.Entity<Student>()
    .HasRequired(student => student.School)
  //.WithMany(school => school.Students)
    .WithMany()
    .HasForeignKey(student => student.SchoolId);