educoder/db/migrate/20190621105144_sync_ivalid_users.rb

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