The UPDATE statement conflicted with the FOREIGN KEY constraint error?

Question

When I try to update a user profile in my app i get the following error:

The UPDATE statement conflicted with the FOREIGN KEY constraint "FK_dbo.UserDetails_dbo.Companies_CompanyId". The conflict occurred in database "aspnet-eksp-20161223071733", table "dbo.Companies", column 'CompanyId'. The statement has been terminated.

Although it may look self explenatory I have no idea how to solve it and make my code work. I am very new with EF and the whole platform in general.

I do have a foreign key in my model, of course, and this foreing key field is not empty, it has a value.

Here is the model :

public class UserDetails
{
    [Key]
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public int UserDetailsId { get; set; }
    public byte[] ImageData { get; set; }
    [NotMapped]
    public HttpPostedFileBase UploadImage { get; set; }
    [NotMapped]
    public string ImageBase64 => System.Convert.ToBase64String(ImageData);
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public string UserAddress { get; set; }
    public string UserCountry { get; set; }
    public string UserPostalCode { get; set; }
    public string UserPhoneNumber { get; set; }
    public int CompanyId { get; set; }
    public virtual Company Company { get; set; }
    public string identtyUserId { get; set; }

}

And the controller method :

public ActionResult Edit([Bind(Include = "UserDetailsId,ImageData,FirstName,LastName,UserAddress,UserCountry,UserPostalCode,UserPhoneNumber,CompanyId,identtyUserId")] UserDetails userDetails, HttpPostedFileBase UploadImage)
        {
            if (ModelState.IsValid)
            {
                byte[] buf = new byte[UploadImage.ContentLength];
                UploadImage.InputStream.Read(buf, 0, buf.Length);
                userDetails.ImageData = buf;

                db.Entry(userDetails).State = EntityState.Modified;
                db.SaveChanges();
                return RedirectToAction("Index");

            }
            //ViewBag.CompanyId = new SelectList(db.Companies, "CompanyId", "CompanyName", userDetails.CompanyId);
            return View(userDetails);
        }

In the view I can update everything but the last two fields(in the model), but i doubt this is the problem.

Any help will be appreciated.

Answer 1

Hi Can you tru this . please replace this code under you if statement .

      byte[] buf = new byte[UploadImage.ContentLength];
            UploadImage.InputStream.Read(buf, 0, buf.Length);
            userDetails.ImageData = buf;
     --- here first read the dataof edited userDetail get it from context and chage this object state to modified and thn save.
            var currentUserDetail =   db.UserDetails.FirstOrDefault(f=>f.UserDetailid= Id);
            currentUserDetail.FirstName= userDetails.userDetails;
            db.Entry(currentUserDetail).State = EntityState.Modified;
            db.SaveChanges();
            return RedirectToAction("Index");

Answer 2

Your UserDetails_dbo table has a foreign key column named Companies_CompanyId . You are sending an updated record to the database, a UserDetails_dbo record but the value of the Companies_CompanyId does not exist in the database. Therefore, you are getting that error.

Make sure the updated record you are sending has a value for the foreign key and make sure the value exists in the database.