{"action":"created","comment":{"url":"https://api.github.com/repos/aspnet/Mvc/pulls/comments/24381599","id":24381599,"diff_hunk":"@@ -17,11 +23,21 @@ public class DataAnnotationsModelMetadataProvider : AssociatedMetadataProvider<C\n             return new CachedDataAnnotationsModelMetadata(this, containerType, modelType, propertyName, attributes);\n         }\n \n+        /// <inheritdoc />\n+        /// <remarks>\n+        /// Copies only a few values from the <paramref name=\"prototype\"/>. Unlikely the rest have been computed.\n+        /// </remarks>\n         protected override CachedDataAnnotationsModelMetadata CreateMetadataFromPrototype(\n             CachedDataAnnotationsModelMetadata prototype,\n             Func<object> modelAccessor)\n         {\n-            return new CachedDataAnnotationsModelMetadata(prototype, modelAccessor);\n+            var metadata = new CachedDataAnnotationsModelMetadata(prototype, modelAccessor);\n+            foreach (var keyValuePair in prototype.AdditionalValues)\n+            {\n+                metadata.AdditionalValues.Add(keyValuePair);\n+            }","path":"src/Microsoft.AspNet.Mvc.ModelBinding/Metadata/DataAnnotationsModelMetadataProvider.cs","position":32,"original_position":32,"commit_id":"f93fca1077174d7ca34bfae0eee143aeed45bb37","original_commit_id":"f93fca1077174d7ca34bfae0eee143aeed45bb37","user":{"login":"dougbu","id":6431421,"avatar_url":"https://avatars.githubusercontent.com/u/6431421?v=3","gravatar_id":"","url":"https://api.github.com/users/dougbu","html_url":"https://github.com/dougbu","followers_url":"https://api.github.com/users/dougbu/followers","following_url":"https://api.github.com/users/dougbu/following{/other_user}","gists_url":"https://api.github.com/users/dougbu/gists{/gist_id}","starred_url":"https://api.github.com/users/dougbu/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/dougbu/subscriptions","organizations_url":"https://api.github.com/users/dougbu/orgs","repos_url":"https://api.github.com/users/dougbu/repos","events_url":"https://api.github.com/users/dougbu/events{/privacy}","received_events_url":"https://api.github.com/users/dougbu/received_events","type":"User","site_admin":false},"body":"we don't have a copy constructor for `ModelMetadata`.  I originally placed the `AdditionalValues` copy in the `CachedModelMetadata` copy constructor.  but it looked strange having one copy there and another in the `EmptyModelMetadataProvider.CreateMetadataFromPrototype()` implementation.  so I decided putting the copy in both providers made more sense.","created_at":"2015-02-10T01:10:26Z","updated_at":"2015-02-10T01:10:26Z","html_url":"https://github.com/aspnet/Mvc/pull/1961#discussion_r24381599","pull_request_url":"https://api.github.com/repos/aspnet/Mvc/pulls/1961","_links":{"self":{"href":"https://api.github.com/repos/aspnet/Mvc/pulls/comments/24381599"},"html":{"href":"https://github.com/aspnet/Mvc/pull/1961#discussion_r24381599"},"pull_request":{"href":"https://api.github.com/repos/aspnet/Mvc/pulls/1961"}}},"pull_request":{"url":"https://api.github.com/repos/aspnet/Mvc/pulls/1961","id":28753519,"html_url":"https://github.com/aspnet/Mvc/pull/1961","diff_url":"https://github.com/aspnet/Mvc/pull/1961.diff","patch_url":"https://github.com/aspnet/Mvc/pull/1961.patch","issue_url":"https://api.github.com/repos/aspnet/Mvc/issues/1961","number":1961,"state":"closed","locked":false,"title":"Add `ModelMetadata.AdditionalValues` property 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