demndev Posts - Answer Overflow

demndev

•Created by demndev on 4/15/2023 in #help

✅ ef core can't translate a query

query:

var username = "some username";
var user = await _db.Users
            .FirstOrDefaultAsync(u => u.Username.Value == username);

var username = "some username";
var user = await _db.Users
            .FirstOrDefaultAsync(u => u.Username.Value == username);

UserConfiguration:

public void Configure(EntityTypeBuilder<UserEntity> builder)
    {
        builder.HasKey(u => u.Id);
        
        builder.Property(u => u.Username)
            .HasConversion(
                u => u.Value, 
                value => new Username(value));

        builder.Property(u => u.Password)
            .HasConversion(
                p => p.Value,
                value => Password.FromValue(value));
    }

public void Configure(EntityTypeBuilder<UserEntity> builder)
    {
        builder.HasKey(u => u.Id);
        
        builder.Property(u => u.Username)
            .HasConversion(
                u => u.Value, 
                value => new Username(value));

        builder.Property(u => u.Password)
            .HasConversion(
                p => p.Value,
                value => Password.FromValue(value));
    }

Password VO:

public class Password
{
    public string Value { get; private set; }
    private readonly IPasswordHasher _passwordHasher;

    private Password(string value)
    {
        Value = value;
        _passwordHasher = null!;
    }
    
    private Password(string value, IPasswordHasher passwordHasher)
    {
        _passwordHasher = passwordHasher;
        Value = value;
    }

    public static Password Create(string value, IPasswordHasher passwordHasher)
    {
        Validate(value);

        return new(passwordHasher.GetHash(value), passwordHasher);
    }

    public static Password FromValue(string value)
    {
        return new Password(value);
    }

    public void Update(string newValue)
    {
        Validate(newValue);

        Value = _passwordHasher.GetHash(newValue);
    }
    
    private static void Validate(string value)
    {
        if (value.Length is not (<= 100 and >= 8))
            throw new Exceptions.InvalidPasswordLengthException();
    }
}

public class Password
{
    public string Value { get; private set; }
    private readonly IPasswordHasher _passwordHasher;

    private Password(string value)
    {
        Value = value;
        _passwordHasher = null!;
    }
    
    private Password(string value, IPasswordHasher passwordHasher)
    {
        _passwordHasher = passwordHasher;
        Value = value;
    }

    public static Password Create(string value, IPasswordHasher passwordHasher)
    {
        Validate(value);

        return new(passwordHasher.GetHash(value), passwordHasher);
    }

    public static Password FromValue(string value)
    {
        return new Password(value);
    }

    public void Update(string newValue)
    {
        Validate(newValue);

        Value = _passwordHasher.GetHash(newValue);
    }
    
    private static void Validate(string value)
    {
        if (value.Length is not (<= 100 and >= 8))
            throw new Exceptions.InvalidPasswordLengthException();
    }
}

32 replies

CC#

•Created by demndev on 4/9/2023 in #help

✅ can't map an entity to DB

i'm getting an error on adding a mapped domain entity

9 replies

CC#

•Created by demndev on 4/7/2023 in #help

The best place to handle domain exceptions in an MVC app?

17 replies

CC#

•Created by demndev on 3/15/2023 in #help

Error during SignalR integration test: The 'InvokeCoreAsync' method cannot be called if the connecti

I get the exception System.InvalidOperationException: The 'InvokeCoreAsync' method cannot be called if the connection is not active after running this test:

public class HelpCommandTests
{
    [Fact]
    public async Task HelpCommand_Success()
    {
        const string command = "/help";
        var response = string.Empty;
        var webHostBuilder = new WebHostBuilder()
            .ConfigureServices(services =>
            {
                services.AddSignalR();
            })
            .Configure(app =>
            {
                app.UseRouting();
                app.UseEndpoints(endpoints =>
                {
                    endpoints.MapHub<ChatHub>("/chatHub");
                });
            });

        var server = new TestServer(webHostBuilder);
        var connection = new HubConnectionBuilder()
            .WithUrl(
                "http://localhost/chatHub",
                o => o.HttpMessageHandlerFactory = _ => server.CreateHandler())
            .Build();
        
        await connection.StartAsync();
        
        await connection.InvokeAsync("Command", command);
        
        connection.On<string>("Receive", msg =>
        {
            response += msg;
        });
    }
}

public class HelpCommandTests
{
    [Fact]
    public async Task HelpCommand_Success()
    {
        const string command = "/help";
        var response = string.Empty;
        var webHostBuilder = new WebHostBuilder()
            .ConfigureServices(services =>
            {
                services.AddSignalR();
            })
            .Configure(app =>
            {
                app.UseRouting();
                app.UseEndpoints(endpoints =>
                {
                    endpoints.MapHub<ChatHub>("/chatHub");
                });
            });

        var server = new TestServer(webHostBuilder);
        var connection = new HubConnectionBuilder()
            .WithUrl(
                "http://localhost/chatHub",
                o => o.HttpMessageHandlerFactory = _ => server.CreateHandler())
            .Build();
        
        await connection.StartAsync();
        
        await connection.InvokeAsync("Command", command);
        
        connection.On<string>("Receive", msg =>
        {
            response += msg;
        });
    }
}

BUT when I remove this peace of code:

typeof(ITerminalCommand).Assembly.GetTypesAssignableFrom<ITerminalCommand>().ForEach(s =>
{
    services.AddScoped(typeof(ITerminalCommand), s);
});

typeof(ITerminalCommand).Assembly.GetTypesAssignableFrom<ITerminalCommand>().ForEach(s =>
{
    services.AddScoped(typeof(ITerminalCommand), s);
});

all works fine.

3 replies

CC#

•Created by demndev on 2/26/2023 in #help

❔ issue with central package management

40 replies

CC#

•Created by demndev on 2/20/2023 in #help

✅ Build failed on `dotnet-ef database update`

12 replies

CC#

•Created by demndev on 1/30/2023 in #help

✅ How can I improve this code?

It seems that I should change the way tags are stored. Or should I not?

public async Task<GetNotesByTagsQueryResult> Handle(GetNotesByTagsQuery query, CancellationToken ct)
    {
        var notes = new List<GetNotesByTagsQueryResultItem>();
        
        foreach (var excludedTag in query.ExcludedTags)
        {
            foreach (var includedTag in query.IncludedTags)
            {
                notes = await _db.Notes
                    .Where(n => n.Tags.Contains(includedTag) && !n.Tags.Contains(excludedTag))
                    .ProjectToType<GetNotesByTagsQueryResultItem>()
                    .Distinct()
                    .ToListAsync(ct);
            }
        }

        return new GetNotesByTagsQueryResult { Notes = notes };
    }

public async Task<GetNotesByTagsQueryResult> Handle(GetNotesByTagsQuery query, CancellationToken ct)
    {
        var notes = new List<GetNotesByTagsQueryResultItem>();
        
        foreach (var excludedTag in query.ExcludedTags)
        {
            foreach (var includedTag in query.IncludedTags)
            {
                notes = await _db.Notes
                    .Where(n => n.Tags.Contains(includedTag) && !n.Tags.Contains(excludedTag))
                    .ProjectToType<GetNotesByTagsQueryResultItem>()
                    .Distinct()
                    .ToListAsync(ct);
            }
        }

        return new GetNotesByTagsQueryResult { Notes = notes };
    }

35 replies

CC#

•Created by demndev on 1/27/2023 in #help

✅ Cannot resolve scoped service...

5 replies

Gaming

Programming