实体框架-关联子类外键到父类主键

Question

我想将类问题的外键FormId从列表子问题映射到类Form的主键。实体框架在子问题中没有建立这种关系。

我的形式类。

public class Form
{
    private readonly ICollection _questions = new List();

    public int Id { get; private set; }
    public string Title { get; private set; }
    public string Description { get; private set; }

    ...
}

我的问题课。

public class Question 
{
    private readonly ICollection _subquestions = new List();

    public int Id { get; private set; }
    public string Title { get; private set; }
    public bool Required { get; private set; }
    
    public int? QuestionParentId { get; private set; }
    public Question QuestionParent { get; private set; }

    public int FormId { get; private set; }
    public Form Form { get; private set; }

    ...
}

IEntityTypeConfiguration中的配置应该是什么样子？

Answer 1

实体配置应如下所示

modelBuilder.Entity<Question>()
            .HasOne(q => q.Form)
            .WithMany(f => f._questions);

modelBuilder.Entity<SubQuestion>()
            .HasOne(s => s.Question)
            .WithMany(q => q._subquestions);