Use IEventRegistrationRepository in EventRegistrationManager

src/EventHub.Domain/Events/Registrations/EventRegistrationManager.cs

@@ -1,7 +1,5 @@
-using System;
-using System.Threading.Tasks;
+using System.Threading.Tasks;
 using Volo.Abp;
-using Volo.Abp.Domain.Repositories;
 using Volo.Abp.Domain.Services;
 using Volo.Abp.Identity;
 
@@ -9,9 +7,9 @@ namespace EventHub.Events.Registrations
 {
     public class EventRegistrationManager : DomainService
     {
-        private readonly IRepository<EventRegistration, Guid> _eventRegistrationRepository;
+        private readonly IEventRegistrationRepository _eventRegistrationRepository;
 
-        public EventRegistrationManager(IRepository<EventRegistration, Guid> eventRegistrationRepository)
+        public EventRegistrationManager(IEventRegistrationRepository eventRegistrationRepository)
         {
             _eventRegistrationRepository = eventRegistrationRepository;
         }
@@ -30,7 +28,7 @@ namespace EventHub.Events.Registrations
                 return;
             }
             
-            var registrationCount = await _eventRegistrationRepository.CountAsync(x => x.EventId == @event.Id);
+            var registrationCount = await _eventRegistrationRepository.GetCountAsync(@event.Id);
 
             if (@event.Capacity != null &&  registrationCount >= @event.Capacity)
             {
@@ -66,7 +64,7 @@ namespace EventHub.Events.Registrations
             IdentityUser user)
         {
             return await _eventRegistrationRepository
-                .AnyAsync(x => x.EventId == @event.Id && x.UserId == user.Id);
+                .ExistsAsync(@event.Id, user.Id);
         }
 
         public bool IsPastEvent(Event @event)

src/EventHub.Domain/Events/Registrations/IEventRegistrationRepository.cs

@@ -17,5 +17,7 @@ namespace EventHub.Events.Registrations
             int maxResultCount = int.MaxValue, 
             CancellationToken cancellationToken = default
         );
+
+        Task<bool> ExistsAsync(Guid eventId, Guid userId);
     }
 }

src/EventHub.EntityFrameworkCore/EntityFrameworkCore/Events/Registrations/EventRegistrationRepository.cs

@@ -6,6 +6,7 @@ using System.Collections.Generic;
 using System.Threading;
 using System.Threading.Tasks;
 using Microsoft.EntityFrameworkCore;
+using Volo.Abp.Domain.Repositories;
 using Volo.Abp.Domain.Repositories.EntityFrameworkCore;
 using Volo.Abp.EntityFrameworkCore;
 using Volo.Abp.Identity;
@@ -57,5 +58,11 @@ namespace EventHub.EntityFrameworkCore.Events.Registrations
 
             return await query.ToListAsync(GetCancellationToken(cancellationToken));
         }
+
+        public async Task<bool> ExistsAsync(Guid eventId, Guid userId)
+        {
+            var dbSet = await GetDbSetAsync();
+            return await dbSet.AnyAsync(x => x.EventId == eventId && x.UserId == userId);
+        }
     }
 }