class SyncIvalidUsers < ActiveRecord::Migration[5.2]
  def change
    users = User.where.not(id: 2).find_by_sql("select count(*) as user_count, login from users group by login having user_count>1")
    users.each do |user|
      valid_users = User.where(login: user.login)
      valid_users.each do |valid_user|
        unless valid_user.lastname.present?
          valid_user.delete
        end
      end
    end

    mail_users = User.where.not(id: 2).find_by_sql("select count(*) as user_count, mail from users where mail is not null group by mail having user_count>1")
    mail_users.each do |mail_user|
      valid_mail_users = User.where(mail: mail_user.mail)
      valid_mail_users.each do |valid_mail_user|
        unless valid_mail_user.lastname.present?
          valid_mail_user.delete
        end
      end
    end


    phone_users = User.where.not(id: 2).find_by_sql("select count(*) as user_count, phone from users where phone is not null group by phone having user_count>1")
    phone_users.each do |phone_user|
      valid_phone_users = User.where(phone: phone_user.phone)
      valid_phone_users.each do |valid_phone_user|
        unless valid_phone_user.lastname.present?
          valid_phone_user.delete
        end
      end
    end
  end
end