Cleanup invalid likes without target

# frozen_string_literal: true

class CleanupInvalidLikes < ActiveRecord::Migration[5.1]

  class Like < ApplicationRecord

  end

  def up

    Like.where(target_type: "Post").joins("LEFT OUTER JOIN posts ON posts.id = likes.target_id")

        .where("posts.id IS NULL").delete_all

    Like.where(target_type: "Comment").joins("LEFT OUTER JOIN comments ON comments.id = likes.target_id")

        .where("comments.id IS NULL").delete_all

  end

end