implement two queries

dotnet/AipsCore/Application/Models/Whiteboard/Query/GetRecentWhiteboards/GetRecentWhiteboardsQuery.cs

@@ -0,0 +1,5 @@
+using AipsCore.Application.Abstract.Query;
+
+namespace AipsCore.Application.Models.Whiteboard.Query.GetRecentWhiteboards;
+
+public record GetRecentWhiteboardsQuery(string UserId): IQuery<ICollection<Infrastructure.Persistence.Whiteboard.Whiteboard>>;

dotnet/AipsCore/Application/Models/Whiteboard/Query/GetRecentWhiteboards/GetRecentWhiteboardsQueryHandler.cs

@@ -0,0 +1,35 @@
+using AipsCore.Application.Abstract.Query;
+using AipsCore.Infrastructure.Persistence.Db;
+using Microsoft.EntityFrameworkCore;
+
+namespace AipsCore.Application.Models.Whiteboard.Query.GetRecentWhiteboards;
+
+public class GetRecentWhiteboardsQueryHandler : IQueryHandler<GetRecentWhiteboardsQuery, ICollection<Infrastructure.Persistence.Whiteboard.Whiteboard>>
+{
+    private readonly AipsDbContext _context;
+
+    public GetRecentWhiteboardsQueryHandler(AipsDbContext context)
+    {
+        _context = context;
+    }
+    
+    public async Task<ICollection<Infrastructure.Persistence.Whiteboard.Whiteboard>> Handle(GetRecentWhiteboardsQuery query, CancellationToken cancellationToken = default)
+    {
+        return await GetQuery(query.UserId).ToListAsync(cancellationToken);
+    }
+
+    private IQueryable<Infrastructure.Persistence.Whiteboard.Whiteboard> GetQuery(string userId)
+    {
+        Guid userIdGuid = Guid.Parse(userId);
+
+        return _context.WhiteboardMemberships
+            .Include(m => m.Whiteboard)
+            .Where(m => (
+                m.UserId == userIdGuid &&
+                m.IsBanned == false &&
+                m.Whiteboard != null
+            ))
+            .OrderByDescending(m => m.LastInteractedAt)
+            .Select(m => m.Whiteboard!);
+    }
+}