wiring up map updates

Sledgemapper.Api/Handlers/GetCampaignMapsCommandHandler.cs

@@ -0,0 +1,43 @@
+using MediatR;
+using Microsoft.EntityFrameworkCore;
+using Sledgemapper.Api.Commands;
+using Sledgemapper.Api.Infrastructure.Data;
+using Sledgemapper.Shared.Entities;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Sledgemapper.Api.Handlers
+{
+    public class GetCampaignMapsCommandHandler : IRequestHandler<GetCampaignMapsCommand, List<Session>>
+    {
+        private readonly IMediator _mediator;
+        private readonly SledgemapperDbContext _dbcontext;
+
+        public GetCampaignMapsCommandHandler(IMediator mediator, SledgemapperDbContext dbcontext)
+        {
+            _mediator = mediator;
+            _dbcontext = dbcontext;
+        }
+
+        public async Task<List<Session>> Handle(GetCampaignMapsCommand command, CancellationToken cancellationToken)
+        {
+            try
+            {
+                var user = await _dbcontext.Users.FindAsync(command.UserId);
+                _dbcontext.Attach(user);
+
+                var campaign = await _dbcontext.Campaigns.Where(campaign => campaign.CampaignName == command.CampaignName && campaign.OwnerId == command.UserId).Include(campaign => campaign.Maps).FirstAsync();
+
+                var maps = campaign.Maps.Select(session => new Session { SessionName = session.SessionName, SessionId = session.SessionId }).ToList();
+                return maps;
+            }
+            catch (Exception ex)
+            {
+            }
+            return null;
+        }
+    }
+}