run at your application path within rails console

change_passwords.rb

f = File.new("passwords", 'w')

User.all.each do |u|
  psw = ([*('A'..'Z'),*('0'..'9')]-%w(0 1 I O)).sample(8).join
  office = u.office_id.nil? ? " " : u.office.name
  f.write("office: #{office} fio: #{u.first_name} #{u.middle_name} #{u.last_name} email: #{u.email} password: #{psw}\n\n")
  u.password = psw
  u.password_confirmation = psw
  u.save
end

User.all.each do |u|
u.password = '12345678'
u.password_confirmation = '12345678'
u.save
end