Set a foreign key for same entity in ef core

Question

I want to build parent child entities for the same entity class in Entity Framework Core.

So I have a entity like this:

public class Definition
{
    public int Id{ get; set; }
    public int ParentId { get; set; }
    public string Name { get; set; }
    public bool Active { get; set; }
}

I want to set ParentId as foreign key that refers another Definition Entity as parent entity. How can I do this?

Thanks

Does this answer your question? [Self referencing / parent-child relationship in Entity Framework](https://stackoverflow.com/questions/9955491/self-referencing-parent-child-relationship-in-entity-framework) — Progman, Feb 01 '20 at 12:36

score 0 · Answer 1 · answered Feb 01 '20 at 13:18

add a foreign key attribute for parent defination

 public class Definition
 {  
    [Key]
    public int Id{ get; set; }

    public int? ParentId { get; set; }
    public string Name { get; set; }
    public bool Active { get; set; }

    [ForeignKey("ParentId")]
    public virtual Definition ParentDefinition { get; set; }
}

Set a foreign key for same entity in ef core

1 Answers1