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copied!<p>Below is a simple sample application that shows you the patching Metadata. While your example is a little different this should be a good starting point</p> <pre><code>namespace SO19941925 { internal class Program { private static void Main(string[] args) { IDocumentStore store = new DocumentStore { Url = "http://localhost:8080", DefaultDatabase = "SO19941925" }.Initialize(); using (IDocumentSession session = store.OpenSession()) { for (int i = 0; i < 10; i++) { session.Store(new User {Name = "User" + i}); } session.SaveChanges(); } using (IDocumentSession session = store.OpenSession()) { List<User> users = session.Query<User>().Customize(x => x.WaitForNonStaleResultsAsOfNow()).ToList(); Console.WriteLine("{0} SO19941925.Users", users.Count); } Operation s = store.DatabaseCommands.UpdateByIndex("Raven/DocumentsByEntityName", new IndexQuery {Query = "Tag:Users"}, new ScriptedPatchRequest { Script = @"this['@metadata']['Raven-Clr-Type'] = 'SO19941925.Models.User, SO19941925';" }, true ); s.WaitForCompletion(); using (IDocumentSession session = store.OpenSession()) { List<Models.User> users = session.Query<Models.User>().Customize(x => x.WaitForNonStaleResultsAsOfNow()).ToList(); Console.WriteLine("{0} SO19941925.Models.Users", users.Count); } Console.ReadLine(); } } internal class User { public string Name { get; set; } } } namespace SO19941925.Models { internal class User { public string Name { get; set; } } } </code></pre> <p>UPDATE: Based on the initial answer above, here is the code that actually solves the OP question:</p> <pre><code>store.DatabaseCommands.UpdateByIndex("Raven/DocumentsByEntityName", new IndexQuery {Query = "Tag:Users"}, new ScriptedPatchRequest { Script = @"this['OAuthAccounts']['$type'] = 'System.Collections.ObjectModel.Collection`1[ [Friendorsement.Domain.Membership.IFlexOAuthAccount, Friendorsement.Domain]], mscorlib';", }, true ); </code></pre>

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