I have a question about the method of the follow function of the rails tutorial.
Why should follow (other_user) following< On the contrary, why should unfollow (other_user) not be following.find_by (followed_id: other_user.id) .destroy?
Do you not understand it properly, or is it not good either? I will think.

#Follow users
  def follow (other_user)
    following<<other_user
  end
  #Unfollow user
  def unfollow (other_user)
    active_relationships.find_by (followed_id: other_user.id) .destroy
  end
  # Returns true if the current user is following
  def following? (other_user)
    following.include? (other_user)
  end

has_many: active_relationships, class_name: "Relationship",
                                  foreign_key: "follower_id",
                                  dependent:: destroy
  has_many: following, through:: active_relationships, source:: followed