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Do you actually need to get the author like that at all?
The way the authors are handled I would think just "new UserAuthor(user)" is probably all you need for most situations.
If you actually need a commited instance (eg if you need to get at its ID in your own code) you can do something like "var author = AuthorHandler.Instance.ChangeAuthor(null, new UserAuthor(user))" which will fetch the existing author or commit a new author for the user as necessary.
This might be a bit of n00b question, but I am upgrading a community from 3 -> 4 and I only have limited experience with 4.
I am a little unsure of what is best practice when it comes to getting the author for a user. the GetUserAuthor method has been removed from the API as far as I can see.
I have found a way, but it not really elegant at all:
var authors = AuthorHandler.Instance.GetAuthors(MyUser);
if(authors.Count > 0)
userAuthor = authors[0];
else
userAuthor = new UserAuthor(MyUser);
Anyone out there with a better solution?