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blogentries_sorted_by_day = user.blogentries.group_by {|entry| entry.created_at.to_date }.sort.reverse

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before:

def list_for_blogentries(user)
...

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  def favorite
    message = Message.finder params[:id]
    favorites = current_user.favorites
...

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  def favorite
    message = Message.find params[:id]
        
...