发生参照完整性约束冲突 Nullable FK

Question

I have a nullable int as a fk in my table as seen below. I have made the FK int?. But if i attempt to save with a null value a get a referencial constraint error?

  [Table("Tests")]
  public class Tests : BaseEntity 
  {
    [MaxLength(255)]
    public virtual string TestName { get; set; }

    public virtual int? ProjectId { get; set; }

    [ForeignKey("ProjectId")]
    public virtual Project Project { get; set; }
  }       

 [Table("Project")]
  public class Project : BaseEntity
  {
    [Required, MaxLength(100)]
    public virtual string Name { get; set; }

    [Required, MaxLength(200)]
    public virtual string Type { get; set; }
  }

  public class BaseEntity 
  {
    [Key, Required]
    public virtual int Id { get; set; }

    [Required]
    public virtual DateTime CreatedDate { get; set; }
  }

  _testsRepo.InsertOrUpdateAndGetId(test);

Exception :

System.InvalidOperationException: A referential integrity constraint violation occurred: The property value(s) of 'Project.Id' on one end of a relationship do not match the property value(s) of 'Tests.ProjectId' on the other end.

Answer 1

So the Issue was in the AutoMapper code I needed the following line

.ForMember(dest => dest.ProductId, opts => opts.MapFrom(src => src.ProductId))
.ForMember(dest => dest.Product, opts => opts.Ignore());