EF6 自引用 Table 具有多个 parent 属性，单个 child 集合

Question

我有一个引用自身的 table，但我正在努力获取我想要的映射。我希望能够将 Children 定义为具有给定人作为母亲、父亲、and/or 监护人的人的集合。监护人可以是父亲或母亲。

我想要一个人的树状视图，可以在列出人员的地方浏览；用户可以展开一个人的节点以显示该人的所有 children，而不管 child-defining 关系（母亲、父亲或监护人）。

public partial class Person
{
    [Key]
    public int ID { get; set; }

    [StringLength(100)]
    public string Name { get; set; }


    public int? GuardianID { get; set; }

    [Column("MotherID")]
    public int? MotherID { get; set; }


    [Column("FatherID")]
    public int? FatherID { get; set; }

    [ForeignKey("MotherID")]
    public virtual tblPerson Mother { get; set; }

    [ForeignKey("FatherID")]
    public virtual tblPerson Father { get; set; }

    [ForeignKey("GuardianID")]
    public virtual tblPerson Guardian { get; set; }

    [InverseProperty("Guardian")]
    [InverseProperty("Father")]
    [InverseProperty("Mother")]
    public virtual IEnumerable<tblPerson> children { get; set; }
}

任何帮助将不胜感激，现在我的观点必须如下所示：

    @using Person_MVC.Models
    @model IEnumerable<Person>
    @{
        IEnumerable<Person> children;
    }

    <ul>
        @foreach (Person person in Model.OrderBy(p => p.PersonNumber))
        {
            <li id="Pnl_@Person.ID" data-jstree='{"type":"Person"}' data-Personkey="@Person.ID.ToString()">
                @Person.Name
                @{
            PersonModel db = new PersonModel();
            children = (from p in db.Persons where p.GuardianID == Person.ID || p.Father == Person.ID || p.MotherID == Person.ID select p).ToList();
                }
                @if (children != null && children.Count() > 0)
                {
                    @Html.Partial("PersonTree", children)
                }
            </li>
        }
    </ul>

Answer 1

所有 table 数据都应该在手（否则我们可能会多次调用数据库）。
查找所有没有 parents 的人的列表（即，一个人没有 guardianid、motherid、parentid）并从他们开始部分。

Answer 2

我想更好的解决方案是在您的模型中制作三个导航列表，并且可能有一种方法可以将对象连接到 return 您的所有儿子。

例如

public int? FatherId { get; set; }

public int? GrandFatherId { get; set; }

public int? MotherId { get; set; }

public virtual ICollection<Person> FatherForThose { get; set; }
public virtual Person Father { get; set; }

public virtual ICollection<Person> GrandFatherForThose { get; set; }
public virtual Person GrandFather { get; set; }

public virtual ICollection<Person> MotherForThose { get; set; }
public virtual Person Mother { get; set; }


public ICollection<Person> GetChildren()
{
    var list = FatherForThose.Concat(MotherForThose).ToList();
    foreach (var person in GrandFatherForThose)
    {
        if (list.All(i => i.Id != person.Id))
        {
            list.Add(person);

        }
    }
    return list;
}

但您应该始终注意将它们包含在您的查询中例如

var grand = context.Persons.Include(x => x.FatherForThose)
            .Include(x => x.GrandFatherForThose)
            .Include(x => x.MotherForThose)
            .FirstOrDefault(x => x.Id == 2);

var list = grand.GetChildren();

Answer 3

试试这个也可以...

public partial class Person
    {
        [Key]
        public int ID { get; set; }

        [StringLength(100)]
        public string Name { get; set; }


        public int? GuardianID { get; set; }

        [Column("MotherID")]
        public int? MotherID { get; set; }


        [Column("FatherID")]
        public int? FatherID { get; set; }

        public IEnumerable<Person> Children { get
                {
                    return context.Person.Where(p => p.GuardianID == this.ID || p.Father == this.ID  || p.MotherID == this.ID).ToList();
                } 
        }
    }





 @using Person_MVC.Models
    @model IEnumerable<Person>

    <ul>
        @foreach (Person person in Model.OrderBy(p => p.PersonNumber))
        {
            <li id="Pnl_@Person.ID" data-jstree='{"type":"Person"}' data-Personkey="@Person.ID.ToString()">
                @Person.Name

                @if (Person.Children != null && Person.Children.Count() > 0)
                {
                    @Html.Partial("PersonTree", Person.Children)
                }
            </li>
        }
    </ul>

EF6 自引用 Table 具有多个 parent 属性，单个 child 集合

EF6 Self Referencing Table with multiple parent properties, single child collection

entity-framework

fluent

data-annotations

self-referencing-table