def remove_friendship(user)
      friend_ids.delete(user.id)
      user.inverse_friend_ids.delete(self.id)
      inverse_friend_ids.delete(user.id)
      user.friend_ids.delete(self.id)
      pending_friend_ids.delete(user.id)
      user.pending_inverse_friend_ids.delete(self.id)
      pending_inverse_friend_ids.delete(user.id)
      user.pending_friend_ids.delete(self.id)
      self.save && user.save
    end
def remove_friendship(user)
      friend_ids.delete(user.id)
      user.inverse_friend_ids.delete(self.id)
      inverse_friend_ids.delete(user.id)
      user.friend_ids.delete(self.id)
      pending_friend_ids.delete(user.id)
      user.pending_inverse_friend_ids.delete(self.id)
      pending_inverse_friend_ids.delete(user.id)
      user.pending_friend_ids.delete(self.id)
      self.save && user.save
    end
deletes a friendship