如何配置多对多实体框架关系，但要同一个对象？ EF6

Question

I have a class, like so

public MyObject {
    public long Id { get; set; }
    public string Name {get; set; }
}

I would like to setup a link between this class and another object of the same type. So i need another object to handle the many-to-many relationship, which is fine, something like this

public MyRelationship {
    public long Id { get; set; }
    public string Name { get; set; }
}

But how do i configure the rest. I have tried examples online, but they are too different objects.

I have tried adding to navigation properties to MyRelationship for the link, like so

public MyRelationship {
    public long Id { get; set; }
    public string Name { get; set; }

    public MyObject Parent { get; set; }
    public MyObject Child { get; set; }
}

And also 2 collections to MyObject, like so

public MyObject {
    public long Id { get; set; }
    public string Name {get; set; }

    public virtual ICollection<MyRelationship> ParentRelationships { get; set; }

    public virtual ICollection<MyRelationship> ChildRelationships { get; set; }
}

Then in my configuration file i have added

// relationships
this.HasMany(e => e.ParentRelationships)
    .WithRequired(e => e.Parent)
    .HasForeignKey(e => e.ParentId)
    .WillCascadeOnDelete(false);

this.HasMany(e => e.ChildRelationships)
    .WithRequired(e => e.Child)
    .HasForeignKey(e => e.ChildId)
    .WillCascadeOnDelete(false);

But i get errors, like this

he navigation property 'ChildRelationships' declared on type 'MyObject' has been configured with conflicting foreign keys.

Answer 1

Why don't you just do this?

public MyObject{
    public long Id { get; set; }
    public string Name { get; set; }

    public ICollection<MyObject> Parents { get; set; }
    public ICollection<MyObject> Children { get; set; }
}