class Account < ActiveDynamo::Base
  table name: 'account', partition_key: :no, sort_key: :balance
  attributes no: Integer, balance: Integer, kind: String
end

account = Account.new(no: 123, balance: 2000, kind: 'current')
account.save

# or use `create`
account = Account.create(no: 123, balance: 2000, kind: 'current')

Account.all

Account.where(no: 123, balance: 2000)
Account.where("no = 123 and balance >= 2000 and kind = 'current'")

Account.find(no: 123, balance: 2000)

account = Account.first
account.update(kind: 'savings')

Account.destroy(no: 123, balance: 2000)