You can't create two Template content items with the same name (title) any more, fixes #6360

src/Orchard.Web/Modules/Orchard.Templates/Drivers/TitlePartDriver.cs

@@ -0,0 +1,46 @@
+using Orchard.ContentManagement;
+using Orchard.ContentManagement.Drivers;
+using Orchard.Core.Title.Models;
+using Orchard.Localization;
+using Orchard.Templates.Models;
+using System.Linq;
+
+namespace Orchard.Templates.Drivers {
+    public class TitlePartDriver : ContentPartDriver<TitlePart> {
+        private readonly IContentManager _contentManager;
+
+        public Localizer T { get; set; }
+
+        public TitlePartDriver(IContentManager contentManager) {
+            _contentManager = contentManager;
+
+            T = NullLocalizer.Instance;
+        }
+
+        protected override DriverResult Editor(TitlePart part, IUpdateModel updater, dynamic shapeHelper) {
+            if (!part.ContentItem.Has<ShapePart>()) {
+                return null;
+            }
+
+            updater.TryUpdateModel(part, Prefix, null, null);
+
+            // We need to query for the content type names because querying for content parts has no effect on the database side.
+            var contentTypesWithShapePart = _contentManager
+                .GetContentTypeDefinitions()
+                .Where(typeDefinition => typeDefinition.Parts.Any(partDefinition => partDefinition.PartDefinition.Name == "ShapePart"))
+                .Select(typeDefinition => typeDefinition.Name)
+                .ToArray();
+
+            var existingShapeCount = _contentManager
+                .Query(VersionOptions.Latest, contentTypesWithShapePart)
+                .Where<TitlePartRecord>(record => record.Title == part.Title && record.ContentItemRecord.Id != part.ContentItem.Id)
+                .Count();
+
+            if (existingShapeCount > 0) {
+                updater.AddModelError("ShapeNameAlreadyExists", T("A template with the given name already exists."));
+            }
+
+            return null;
+        }
+    }
+}

src/Orchard.Web/Modules/Orchard.Templates/Orchard.Templates.csproj

@@ -162,6 +162,7 @@
   <ItemGroup>
     <Compile Include="AdminMenu.cs" />
     <Compile Include="Controllers\AdminController.cs" />
+    <Compile Include="Drivers\TitlePartDriver.cs" />
     <Compile Include="Helpers\StringExtensions.cs" />
     <Compile Include="Handlers\ShapePartHandler.cs" />
     <Compile Include="Drivers\ShapePartDriver.cs" />