EF使用fluent api创建可选关系

本文关键字：关系 创建 api 使用 fluent EF | 更新日期: 2023-09-27 18:08:17

这些是我的类:

public class Department
{
    [Key]
    [Column("Department_Id")]
    public int DepartmentId { get; set; }
    [Required]
    [Column("Name")]
    public string Name { get; set; }
    [Column("Manager_Id")]
    public int? ManagerId { get; set; }
    [Column("Parent_Department_Id")]
    public int? ParentDeptId { get; set; }
    public virtual ICollection<Department> ChildDepartments { get; set; }
    public virtual Department ParentDepartment { get; set; }
    public virtual Employee Manager { get; set; }
}
public class Employee
{
    [Key]
    [Column("Employee_Id")]
    public int Id { get; set; }
    [Required]
    [Column("First_Name")]
    public string FirstName { get; set; }
    [Required]
    [Column("Last_Name")]
    public string LastName { get; set; }
    [Required]
    [Column("Job_Title_Id")]
    [ForeignKey("JobTitle")]
    public int? JobTitleId { get; set; }
    [Column("Manager_Id")]
    public int? ManagerId { get; set; }
    [Required]
    [Column("Department_Id")]
    public int? DepartmentId { get; set; }
    public virtual Department Department { get; set; }
    public virtual JobTitle JobTitle { get; set; }
}

现在在Department中Manager是可选的。我如何使用流利的api建立这种关系?我想我需要使用modelBuilder.Entity<Department>().HasOptional(e => e.Manager)，但不知道下一步该怎么做。我做错了什么?

更新:我已经为我的部门准备了这段代码，如果有什么不同的话:

modelBuilder.Entity<Department>()
            .HasMany(e => e.ChildDepartments)
            .WithOptional(e => e.ParentDepartment)
            .HasForeignKey(e => e.ParentDeptId);

EF使用fluent api创建可选关系

你需要完成这个关系

 modelBuilder.Entity<Department>().HasOptional(e => e.Manager).WithOptionalDependent();
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