How to create notifications for this custom following relationships.

[Deleted user]

Hi! I created a following relationship on my app and I'm trying to create notifications for the current_user whenever followed by another user.
I've tried to implement but notifications are not creating. It seems to be different for other types I've created.

user.rb

has_many :follower_relationships, foreign_key: :following_id, class_name: 'Follow'
  has_many :followers, through: :follower_relationships, source: :follower

  has_many :following_relationships, foreign_key: :follower_id, class_name: 'Follow'
  has_many :following, through: :following_relationships, source: :following

  def follow(user_id)
    following_relationships.create(following_id: user_id)
  end

  def unfollow(user_id)
    following_relationships.find_by(following_id: user_id).destroy
  end

relationships_controller

class RelationshipsController < ApplicationController
  def follow_user
    @user = User.find_by! username: params[:username]
    if current_user.follow @user.id
      respond_to do |format|
        format.html { redirect_to root_path }
        format.js
      end
    end
  end

  def unfollow_user
    @user = User.find_by! username: params[:username]
    if current_user.unfollow @user.id
      respond_to do |format|
        format.html { redirect_to root_path }
        format.js
      end
    end
  end
end

follow.rb

class Follow < ApplicationRecord
	belongs_to :follower, foreign_key: 'follower_id', class_name: 'User'
  	belongs_to :following, foreign_key: 'following_id', class_name: 'User'
end

I've tried this with the codes below but it's not working
user.rb

after_commit :create_notifications, on: :follow

  private

  def create_notifications
    self.user.following.each do |follower|
      Notification.create(notify_type: 'new_follower', actor: self, user: user)
 
    end
  end

  after_commit :create_notifications, on: :follow

  private

and also this in notify.rb

# Auto generate with notifications gem.
class Notification < ActiveRecord::Base
  include Notifications::Model

  def self.notify_follow(user_id, follower_id)
    opts = {
      notify_type: "follow",
      user_id: user_id,
      actor_id: follower_id
    }
    return if Notification.where(opts).count > 0
    Notification.create opts
  end
end