Transaction Strategy

The transaction strategy wraps your action execution in a database transaction:

class TransferFunds
  include Axn

  use :transaction

  expects :from_account, :to_account, :amount

  def call
    from_account.withdraw!(amount)
    to_account.deposit!(amount)
    expose :transfer_id, SecureRandom.uuid
  end
end

Important: The transaction wraps:

• before hooks
• The main call method
• after hooks

So the transaction is still open until all of the above complete. If any of them raise or call fail!, the transaction is rolled back.

on_success runs after the transaction commits. It is invoked only after the transaction block has finished successfully. Use on_success (not after hooks) for work that should run outside the transaction—for example, calling an external HTTP service—so the DB transaction can commit and release the connection before that work runs. Putting slow or unreliable external calls inside call or after keeps the transaction open until they complete and can block the connection.

Requirements: Requires ActiveRecord to be available in your application.