Question

我正在努力解决两种不同寻常的关系。我还没有找到一种方法来告诉＆＃34; EF如何正确构建其模型。我在这里使用精简课程来专注于关系。它们似乎不是通常的1-1,1-M，M-M模具。

第一

public class Parent1 {
    public int Id { get; set; }
    public string Description { get; set; }

    public ICollection<Child> Children { get; set; }
}

public class Parent2 {
    public int Id { get; set; }
    public string Description { get; set; }

    public ICollection<Child> Children { get; set; }
}

public class Child {
    public int Id { get; set; }
    public string OtherStuff { get; set; }

    public int Parent1Id { get; set; }
    public Parent1 Parent1 { get; set; }

    public int Parent2Id { get; set; }
    public Parent2 Parent2 { get; set; }
}

and my fluent API

modelBuilder.Entity<Parent1>()
.HasMany(c => c.Children)
.WithOne(d => d.Parent1)
.HasForeignKey(c => c.Parent1Id)
.IsRequired()
.OnDelete(DeleteBehavior.Cascade);


modelBuilder.Entity<Parent2>()
.HasMany(c => c.Children)
.WithOne(d => d.Parent2)
.HasForeignKey(c => c.Parent2Id)
.IsRequired()
.OnDelete(DeleteBehavior.Cascade);

EF似乎不喜欢从两个方向级联删除。

第二

public class Parent {
    public int Id { get; set; }
    public string Description { get; set; }

    public ICollection<Child> Children { get; set; }
}

public class Child {
    public int Id { get; set; }
    public string OtherStuff { get; set; }

    public int Parent1Id { get; set; }    // Think "Mail to"
    public Parent Parent1 { get; set; }

    public int Parent2Id { get; set; }    // Think "Bill To".  Same table, different purpose
    public Parent Parent2 { get; set; }
}

and my fluent API

modelBuilder.Entity<Parent>()
.HasMany(c => c.Children)
.WithOne(d => d.Parent1)
.HasForeignKey(c => c.Parent1Id)
.IsRequired()
.OnDelete(DeleteBehavior.Cascade);


modelBuilder.Entity<Parent>()
.HasMany(c => c.Children)
.WithOne(d => d.Parent2)
.HasForeignKey(c => c.Parent2Id)
.IsRequired()
.OnDelete(DeleteBehavior.Cascade);

EF并不喜欢指向同一实体中的两个父母。

EF Core 2.0如何配置双亲的孩子

0 个答案: