[Rails] How do you include json attributes when using "respond_with"?

I have a controller action that returns JSON data.

def create
@comment = @site_update.comments.new
@comment.attributes = params[:comment]
@comment.author = current_user

if @comment.save
respond_with @comment, :include => :author
else
respond_with @comment.errors
end
end

This is obviously not working. How can I include the :author of the
comment with the respond_with method?

Thanks

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