Cascade delete Entity Framework Identity User with relations - razor

Question

I have using .net Core 3.1 scaffolded Identity and extended that with my own classes. But when I use the build in DeletePersonalData.OnPostAsync() it fails due to my relations from my other classes. I don't get how I make the delete to delete all the extended classes too.
Error message:
SqlException: The DELETE statement conflicted with the REFERENCE
constraint "FK_Workspaces_AspNetUsers_OwnerId". The conflict occurred
in database "myupload", table "dbo.Workspaces", column 'OwnerId'. The
statement has been terminated.
Microsoft.Data.SqlClient.SqlCommand+<>c.b__164_0(Task
result)
Extended Identity:
public class ApplicationDbContext : IdentityDbContext<IdentityUser>
{
public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options)
: base(options)
{
}
public DbSet<MyFile> MyFiles { get; set; }
public DbSet<Workspace> Workspaces { get; set; }
public DbSet<WorkspacePermission> WorkspacePermissions { get; set; }
protected override void OnModelCreating(ModelBuilder builder)
{
base.OnModelCreating(builder);
// Customize the ASP.NET Identity model and override the defaults if needed.
// For example, you can rename the ASP.NET Identity table names and more.
// Add your customizations after calling base.OnModelCreating(builder);
builder.Entity<Workspace>()
.HasOne(p => p.Owner)
.WithMany()
.OnDelete(DeleteBehavior.Cascade);
builder.Entity<MyFile>()
.HasOne(p => p.Workspace)
.WithMany(b => b.MyFile);
}
}
And the delete method:
public async Task<IActionResult> OnPostAsync()
{
var user = await _userManager.GetUserAsync(User);
if (user == null)
{
return NotFound($"Unable to load user with ID '{_userManager.GetUserId(User)}'.");
}
RequirePassword = await _userManager.HasPasswordAsync(user);
if (RequirePassword)
{
if (!await _userManager.CheckPasswordAsync(user, Input.Password))
{
ModelState.AddModelError(string.Empty, "Incorrect password.");
return Page();
}
}
var result = await _userManager.DeleteAsync(user);
var userId = await _userManager.GetUserIdAsync(user);
if (!result.Succeeded)
{
throw new InvalidOperationException($"Unexpected error occurred deleting user with ID '{userId}'.");
}
await _signInManager.SignOutAsync();
_logger.LogInformation("User with ID '{UserId}' deleted themselves.", userId);
return Redirect("~/");
}
}
One of the Classes:
public class Workspace
{
// Base
public Guid WorkspaceID { get; set; }
public string Name { get; set; }
// Security
public virtual IdentityUser Owner { get; set; }
public string Password { get; set; }
// Files
public virtual ICollection<MyFile> MyFile { get; set; }
// Statistics
public Workspace()
{
}
}

Answer 1

Using Fluent API I managed to add the Cascade Delete to the IdentityUser with this Code in the OnModelCreating method.
builder.Entity<Workspace>()
.HasOne(p => p.Owner)
.WithMany()
.OnDelete(DeleteBehavior.Cascade);
builder.Entity<MyFile>()
.HasOne(p => p.Workspace)
.WithMany(b => b.MyFile);