growstuff/app/models/follow.rb

# frozen_string_literal: true

class Follow < ApplicationRecord
  belongs_to :follower, class_name: "Member", inverse_of: :follows
  belongs_to :followed, class_name: "Member", inverse_of: :inverse_follows
  validates :follower_id, uniqueness: { scope: :followed_id }

  after_create do
    Notification.create(
      recipient_id: followed_id,
      sender_id:    follower_id,
      subject:      "#{follower.login_name} is now following you",
      body:         "#{follower.login_name} just followed you on #{ENV.fetch('GROWSTUFF_SITE_NAME', nil)}. ",
      notifiable:   self
    )
  end
end