Is this working?

I have install this nuget packet in my sample project. But this don’t create any historie data in my database. Here my implementation:

DbContext:

public class BlogDataDbContext: DbContext
{
        public BlogDataDbContext(DbContextOptions<BlogDataDbContext> options): base(options)
        {
        }

        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
            modelBuilder.EnableAutoHistory(null);
        }

        

        public DbSet<Blog> Blogs { get; set; }
}

Somemethod of saving:

 public class EditModel : PageModel
    {
        private readonly BlogDataDbContext _context;

        public EditModel(BlogDataDbContext context)
        {
            _context = context;
            _context.EnsureAutoHistory();
        }

        [BindProperty]
        public Data.BlogData.Blog Blog { get; set; }

        public async Task<IActionResult> OnGetAsync(Guid? id)
        {
            if (id == null)
            {
                return NotFound();
            }

            Blog = await _context.Blogs.SingleOrDefaultAsync(m => m.BlogId == id);

            if (Blog == null)
            {
                return NotFound();
            }
            return Page();
        }

        public async Task<IActionResult> OnPostAsync()
        {
            if (!ModelState.IsValid)
            {
                return Page();
            }

            _context.Attach(Blog).State = EntityState.Modified;

            try
            {
                await _context.SaveChangesAsync();
            }
            catch (DbUpdateConcurrencyException)
            {
                if (!BlogExists(Blog.BlogId))
                {
                    return NotFound();
                }
                else
                {
                    throw;
                }
            }

            return RedirectToPage("./Index");
        }

        private bool BlogExists(Guid id)
        {
            return _context.Blogs.Any(e => e.BlogId == id);
        }
    }

After the change of an element no new entry in the AutoHistorie table. This is strange…

[xyting]

Yeah, maybe the README SHOULD be updated.

[xyting]

Oh, I’m sorry, _context.SaveChangesAsync(true); is my UnitOfWork feature, If you only use this nuget package, the correct usage is invoke _context.EnsureAutoHistory(); before await _context.SaveChangesAsync();

Tips: Your issue is your code invoke the _context.EnsureAutoHistory(); in EditModel constructor, but nothing changed in there. The correct is in your OnPostAsync() like following:

public async Task<IActionResult> OnPostAsync()
    {
        if (!ModelState.IsValid)
        {
            return Page();
        }

        _context.Attach(Blog).State = EntityState.Modified;

        try
        {
            // Ensure for generating the changing history
            _context.EnsureAutoHistory();
            // The changing history will insert into AutoHistories table
            await _context.SaveChangesAsync();
        }
        catch (DbUpdateConcurrencyException)
        {
            if (!BlogExists(Blog.BlogId))
            {
                return NotFound();
            }
            else
            {
                throw;
            }
        }

        return RedirectToPage("./Index");
    }