Рабочий чат

backend/src/Modules/Auth/Application/Users/GetUsersExistenceHandler.cs

@@ -0,0 +1,31 @@
+using Knot.Shared.Kernel;
+using Knot.Contracts.Auth.Application.Abstractions;
+using Knot.Contracts.Auth.Domain;
+using Microsoft.EntityFrameworkCore;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Knot.Modules.Auth.Application.Users;
+
+internal sealed class GetUsersExistenceQueryHandler : IQueryHandler<GetUsersExistenceQuery, List<Guid>>
+{
+    private readonly IAuthDbContext _context;
+
+    public GetUsersExistenceQueryHandler(IAuthDbContext context)
+    {
+        _context = context;
+    }
+
+    public async Task<Result<List<Guid>>> Handle(GetUsersExistenceQuery request, CancellationToken cancellationToken)
+    {
+        var existingIds = await _context.Set<Knot.Modules.Auth.Domain.User>()
+            .Where(u => request.UserIds.Contains(u.Id))
+            .Select(u => u.Id)
+            .ToListAsync(cancellationToken);
+
+        return Result.Success(existingIds);
+    }
+}