See ActiveRecord::Transactions::ClassMethods for documentation.

Namespace
Methods
A
R
T
W
Instance Public methods
add_to_transaction()

Add the record to the current transaction so that the :after_rollback and :after_commit callbacks can be called.

Source: show | on GitHub 

# File activerecord/lib/active_record/transactions.rb, line 279
def add_to_transaction
  if self.class.connection.add_transaction_record(self)
    remember_transaction_record_state
  end
end
rollback_active_record_state!()

Reset id and @new_record if the transaction rolls back.

Source: show | on GitHub 

# File activerecord/lib/active_record/transactions.rb, line 250
def rollback_active_record_state!
  remember_transaction_record_state
  yield
rescue Exception
  IdentityMap.remove(self) if IdentityMap.enabled?
  restore_transaction_record_state
  raise
ensure
  clear_transaction_record_state
end
transaction(options = {}, &block)

See ActiveRecord::Transactions::ClassMethods for detailed documentation.

Source: show | on GitHub 

# File activerecord/lib/active_record/transactions.rb, line 231
def transaction(options = {}, &block)
  self.class.transaction(options, &block)
end
with_transaction_returning_status()

Executes method within a transaction and captures its return value as a status flag. If the status is true the transaction is committed, otherwise a ROLLBACK is issued. In any case the status flag is returned.

This method is available within the context of an ActiveRecord::Base instance.

Source: show | on GitHub 

# File activerecord/lib/active_record/transactions.rb, line 291
def with_transaction_returning_status
  status = nil
  self.class.transaction do
    add_to_transaction
    status = yield
    raise ActiveRecord::Rollback unless status
  end
  status
end