class AddPraisesCountToMemos < ActiveRecord::Migration[5.2]
  def change
    add_column :memos, :praises_count, :integer, :default => 0

    memos = Memo.includes(:praise_treads).all
    memos.find_each do |m|
      puts("####{m.id}")
      praises_count = m.praise_treads.select{|pt| pt.praise_or_tread == 1}.count
      m.update_column(:praises_count, praises_count)
    end
  end
end