Hello all,
I have a project that throws an error when I try to delete a record. References to the primary key exists within the ProductDescription table. I've tried the fluid api method of defining the foreign key. Where am I going wrong?
public class Product
{
[Key]
public int Id { get; set; }
public string ProductName { get; set; }
public string Price { get; set; }
public ProductDescription ProductDescriptions {get; set;}
}
public class ProductDescription
{
public int DescriptionId { get; set; }
public string Amount { get; set; }
public string Colour { get; set; }
public Product Product { get; set; }
}
public async Task<IActionResult> Delete(int? id)
{
if (id == null) return NotFound();
var products = await _context.Product
.SingleOrDefaultAsync(m => m.Id == id);
if (products == null) NotFound();
return View(products);
}
[HttpPost, ActionName("Delete")]
[ValidateAntiForgeryToken]
public async Task<IActionResult> DeleteConfirmed(int id)
{
var product = await _context.Product.SingleOrDefaultAsync(m => m.Id == id);
_context.Product.Remove(product);
await _context.SaveChangesAsync();
return RedirectToAction(nameof(Index));
}
protected override void OnModelCreating(ModelBuilder builder)
{
builder.Entity<Product>()
.HasOne(s => s.ProductDescription)
.WithMany()
.OnDelete(DeleteBehavior.Cascade);
base.OnModelCreating(builder);
}
public DbSet<Product> Products { get; set; }
public DbSet<ProductDescription> ProductDescriptions { get; set; }
An unhandled exception occurred while processing the request. SqlException: The DELETE statement conflicted with the REFERENCE constraint "FK_ProductDescriptions_Product_ProductId". The conflict occurred in database "FoodInventoryDB", table "dbo.ProductDescriptions", column 'ProductId'. The statement has been terminated.
So I finally fixed it. Hope this helps others...
This is what I did:
[HttpPost, ActionName("Delete")]
[ValidateAntiForgeryToken]
public async Task<IActionResult> DeleteConfirmed(int id)
{
var product = await _context.Product.SingleOrDefaultAsync(m => m.Id == id);
var stuff = await _context.ProductDescription.FirstOrDefaultAsync(c => c.Product.Id == id);
_context.Product.Remove(product);
_context.ProductDescription.Remove(stuff);
await _context.SaveChangesAsync();
return RedirectToAction(nameof(Index));
}
builder.Entity<Product>()
.HasMany(s => s.ProductDescription)
.WithOne(c = c.Product)
.OnDelete(DeleteBehavior.Cascade);
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