metamaps--metamaps/app/models/follow.rb

# frozen_string_literal: true
class Follow < ApplicationRecord

  belongs_to :user
  belongs_to :followed, polymorphic: true
  has_one    :follow_reason, dependent: :destroy
  
  validates :user, presence: true
  validates :followed, presence: true
  validates :user, uniqueness: { scope: :followed, message: 'This entity is already followed by this user' }
  
  after_create :add_subsetting

  scope :active, -> {
    where(muted: false)
  } 

  private

  def add_subsetting
    follow_reason = FollowReason.create!(follow: self)
  end
end