initial commit

Presentation/GraphQL/DataLoaders/KillsDataLoader.cs

@@ -0,0 +1,28 @@
+using Application.Interfaces.Services;
+using Domain.Entities;
+using GreenDonut.Data;
+using Microsoft.EntityFrameworkCore;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace GraphQLTEST.GraphQL.DataLoaders;
+
+public class KillsByUserDataLoader : GroupedDataLoader<int, Kill>{
+    private readonly IServiceProvider _serviceProvider;
+    
+    public KillsByUserDataLoader(
+        IServiceProvider serviceProvider,
+        IBatchScheduler batchScheduler,
+        DataLoaderOptions options): base(batchScheduler, options){
+            _serviceProvider = serviceProvider;
+        }
+
+    protected override async Task<ILookup<int, Kill>> LoadGroupedBatchAsync(IReadOnlyList<int> keys, CancellationToken cancellationToken)
+    {
+        await using var scope = _serviceProvider.CreateAsyncScope();
+        var service = scope.ServiceProvider.GetRequiredService<IKillService>();
+
+        return await service.GetKillsByUserId(keys)
+            .ToAsyncEnumerable()
+            .ToLookupAsync(k => k.UserId, cancellationToken: cancellationToken);
+    }
+}