deleting systems works only if they are orphaned (no games attached)

Src/VideoGameQuotes.Web/Controllers/SystemController.cs

@@ -1,6 +1,7 @@
 using System.Collections.Generic;
 using System.Linq;
 using System.Web.Mvc;
+using Portoa.Persistence;
 using Portoa.Util;
 using Portoa.Web.Controllers;
 using VideoGameQuotes.Api;
@@ -16,6 +17,28 @@ namespace VideoGameQuotes.Web.Controllers {
 			this.systemService = systemService;
 		}
 
+		[HttpPost, VerifyUser(Group = UserGroup.Admin)]
+		public JsonResult Delete(int id) {
+			if (id < 1) {
+				return Json(this.CreateJsonResponse("Invalid ID"));
+			}
+
+			try {
+				var system = systemService.FindById(id);
+				var games = systemService.GetGamesForSystem(system);
+				if (games.Any()) {
+					return Json(this.CreateJsonErrorResponse(
+						string.Format("The following games are still using this system: {0}", games.Implode(game => game.Name, ", "))
+					));
+				}
+			} catch (EntityNotFoundException) {
+				return Json(this.CreateJsonErrorResponse("No system exists for ID " + id));
+			}
+
+			systemService.Delete(id);
+			return Json(this.CreateJsonResponse());
+		}
+
 		[HttpPost, VerifyUser(Group = UserGroup.Admin)]
 		public JsonResult Edit(EditSystemModel model) {
 			if (model.SystemId < 1) {

Src/VideoGameQuotes.Web/Global.asax.cs

@@ -71,7 +71,7 @@ namespace VideoGameQuotes.Web {
 			//bullshit route so that RenderAction works
 			routes.MapRoute("mainmenu", "home/mainmenu", new { controller = "Home", action = "MainMenu" });
 
-			routes.MapRoute("crud-default", "{controller}/{action}", null, new { controller = "system|publisher|game", action = "create|edit" });
+			routes.MapRoute("crud-default", "{controller}/{action}", null, new { controller = "system|publisher|game", action = "create|edit|delete" });
 
 			routes.MapRoute("users-paged", "admin/users/{start}-{end}", new { controller = "Admin", action = "Users" }, new { start = @"\d+", end = @"\d+" });
 			routes.MapRoute("admin", "admin/{action}", new { controller = "Admin", action = "Index" }, new { action = "users|create|flags|password" });

Src/VideoGameQuotes.Web/Services/SystemService.cs

@@ -9,13 +9,17 @@ namespace VideoGameQuotes.Web.Services {
 		IEnumerable<GamingSystem> FindByNameOrAbbreviation(string name, string abbreviation);
 		GamingSystem Save(GamingSystem system);
 		GamingSystem FindById(int id);
+		void Delete(int id);
+		IEnumerable<Game> GetGamesForSystem(GamingSystem system);
 	}
 
 	public class SystemService : ISystemService {
 		private readonly IRepository<GamingSystem> repository;
+		private readonly IRepository<Game> gameRepository;
 
-		public SystemService(IRepository<GamingSystem> repository) {
+		public SystemService(IRepository<GamingSystem> repository, IRepository<Game> gameRepository) {
 			this.repository = repository;
+			this.gameRepository = gameRepository;
 		}
 
 		[UnitOfWork]
@@ -34,5 +38,16 @@ namespace VideoGameQuotes.Web.Services {
 		public GamingSystem FindById(int id) {
 			return repository.FindById(id);
 		}
+
+		[UnitOfWork]
+		public void Delete(int id) {
+			repository.Delete(id);
+		}
+
+		public IEnumerable<Game> GetGamesForSystem(GamingSystem system) {
+			return gameRepository
+				.Records
+				.Where(game => game.Systems.Contains(system));
+		}
 	}
 }

Src/VideoGameQuotes.Web/media/js/vgquotes.js

@@ -544,12 +544,13 @@
 			
 			var gameId = $("#GameId").val();
 			$.vgquotes.getResourceById("game", gameId, function(game) {
+				$("#edit-game-link").toggleClass("edit-link loading-link");
+				
 				if (game === null) {
 					alert("Unable to fetch game " + gameId);
 					return;
 				}
 				
-				$("#edit-game-link").toggleClass("edit-link loading-link");
 				toggleFormAndLink("game")();
 				$("#create-game-form > .edit-mode").val(1);
 				$("#create-game-form > fieldset > legend").text("Edit Game");
@@ -578,12 +579,13 @@
 			var systemId = $link.siblings("input[name='SystemIds']").val();
 			
 			$.vgquotes.getResourceById("system", systemId, function(system) {
+				$link.toggleClass("edit-link loading-link");
+				
 				if (system === null) {
 					alert("Unable to fetch system " + systemId);
 					return;
 				}
 				
-				$link.toggleClass("edit-link loading-link");
 				toggleFormAndLink("system")();
 				$("#create-system-form > .edit-mode").val(systemId);
 				$("#create-system-form > fieldset > legend").text("Edit System");
@@ -596,6 +598,30 @@
 			
 			return false;
 		});
+		
+		$(".delete-system-link").click(function() {
+			var $link = $(this);
+			$link.toggleClass("delete-link loading-link");
+			var systemId = $link.siblings("input[name='SystemIds']").val();
+			
+			$.ajax("/system/delete", {
+				type: "POST",
+				data: { id: systemId },
+				success: function(data, status, $xhr) {
+					$link.toggleClass("delete-link loading-link");
+					
+					if (data.Error !== null) {
+						alert(data.Error);
+						return;
+					}
+					
+					//remove checkbox for that system
+					$link.parent().empty();
+				}
+			});
+			
+			return false;
+		});
 	};
 
 	(function(){