def find_any_friendship_with(user)
      friendship = Amistad.friendship_class.where(:friendable_id => self.id, :friend_id => user.id).first
      if friendship.nil?
        friendship = Amistad.friendship_class.where(:friendable_id => user.id, :friend_id => self.id).first
      end
      friendship
    end
def find_any_friendship_with(user)
      friendship = Amistad.friendship_class.where(:friendable_id => self.id, :friend_id => user.id).first
      if friendship.nil?
        friendship = Amistad.friendship_class.where(:friendable_id => user.id, :friend_id => self.id).first
      end
      friendship
    end
returns friendship with given user or nil