Fixed: Add missing author when a book's author changes in metadata

Fixes READARR-VH

src/NzbDrone.Core/AuthorStats/AuthorStatisticsService.cs

@@ -15,12 +15,14 @@ namespace NzbDrone.Core.AuthorStats
     }
 
     public class AuthorStatisticsService : IAuthorStatisticsService,
+        IHandle<AuthorAddedEvent>,
         IHandle<AuthorUpdatedEvent>,
         IHandle<AuthorDeletedEvent>,
         IHandle<BookAddedEvent>,
         IHandle<BookDeletedEvent>,
         IHandle<BookImportedEvent>,
         IHandle<BookEditedEvent>,
+        IHandle<BookUpdatedEvent>,
         IHandle<BookFileDeletedEvent>
     {
         private readonly IAuthorStatisticsRepository _authorStatisticsRepository;
@@ -68,6 +70,13 @@ namespace NzbDrone.Core.AuthorStats
             return authorStatistics;
         }
 
+        [EventHandleOrder(EventHandleOrder.First)]
+        public void Handle(AuthorAddedEvent message)
+        {
+            _cache.Remove("AllAuthors");
+            _cache.Remove(message.Author.Id.ToString());
+        }
+
         [EventHandleOrder(EventHandleOrder.First)]
         public void Handle(AuthorUpdatedEvent message)
         {
@@ -110,6 +119,13 @@ namespace NzbDrone.Core.AuthorStats
             _cache.Remove(message.Book.AuthorId.ToString());
         }
 
+        [EventHandleOrder(EventHandleOrder.First)]
+        public void Handle(BookUpdatedEvent message)
+        {
+            _cache.Remove("AllAuthors");
+            _cache.Remove(message.Book.AuthorId.ToString());
+        }
+
         [EventHandleOrder(EventHandleOrder.First)]
         public void Handle(BookFileDeletedEvent message)
         {

src/NzbDrone.Core/Books/Services/RefreshBookService.cs

@@ -14,6 +14,7 @@ using NzbDrone.Core.MediaFiles;
 using NzbDrone.Core.Messaging.Commands;
 using NzbDrone.Core.Messaging.Events;
 using NzbDrone.Core.MetadataSource;
+using NzbDrone.Core.RootFolders;
 
 namespace NzbDrone.Core.Books
 {
@@ -30,6 +31,7 @@ namespace NzbDrone.Core.Books
     {
         private readonly IBookService _bookService;
         private readonly IAuthorService _authorService;
+        private readonly IRootFolderService _rootFolderService;
         private readonly IAddAuthorService _addAuthorService;
         private readonly IEditionService _editionService;
         private readonly IProvideAuthorInfo _authorInfo;
@@ -44,6 +46,7 @@ namespace NzbDrone.Core.Books
 
         public RefreshBookService(IBookService bookService,
                                   IAuthorService authorService,
+                                  IRootFolderService rootFolderService,
                                   IAddAuthorService addAuthorService,
                                   IEditionService editionService,
                                   IAuthorMetadataService authorMetadataService,
@@ -60,6 +63,7 @@ namespace NzbDrone.Core.Books
         {
             _bookService = bookService;
             _authorService = authorService;
+            _rootFolderService = rootFolderService;
             _addAuthorService = addAuthorService;
             _editionService = editionService;
             _authorInfo = authorInfo;
@@ -142,7 +146,7 @@ namespace NzbDrone.Core.Books
                     Metadata = remote.AuthorMetadata.Value,
                     MetadataProfileId = oldAuthor.MetadataProfileId,
                     QualityProfileId = oldAuthor.QualityProfileId,
-                    RootFolderPath = oldAuthor.RootFolderPath,
+                    RootFolderPath = _rootFolderService.GetBestRootFolderPath(oldAuthor.Path),
                     Monitored = oldAuthor.Monitored,
                     Tags = oldAuthor.Tags
                 };

src/Readarr.Api.V1/Author/AuthorController.cs

@@ -29,6 +29,7 @@ namespace Readarr.Api.V1.Author
                                 IHandle<BookImportedEvent>,
                                 IHandle<BookEditedEvent>,
                                 IHandle<BookFileDeletedEvent>,
+                                IHandle<AuthorAddedEvent>,
                                 IHandle<AuthorUpdatedEvent>,
                                 IHandle<AuthorEditedEvent>,
                                 IHandle<AuthorDeletedEvent>,
@@ -255,6 +256,12 @@ namespace Readarr.Api.V1.Author
             BroadcastResourceChange(ModelAction.Updated, GetAuthorResource(message.BookFile.Author.Value));
         }
 
+        [NonAction]
+        public void Handle(AuthorAddedEvent message)
+        {
+            BroadcastResourceChange(ModelAction.Updated, GetAuthorResource(message.Author));
+        }
+
         [NonAction]
         public void Handle(AuthorUpdatedEvent message)
         {