See ActiveRecord::Transactions::ClassMethods for documentation.

Methods
A
R
T
W
Classes and Modules
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
279:     def add_to_transaction
280:       if self.class.connection.add_transaction_record(self)
281:         remember_transaction_record_state
282:       end
283:     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
250:     def rollback_active_record_state!
251:       remember_transaction_record_state
252:       yield
253:     rescue Exception
254:       IdentityMap.remove(self) if IdentityMap.enabled?
255:       restore_transaction_record_state
256:       raise
257:     ensure
258:       clear_transaction_record_state
259:     end
transaction(options = {}, &block)

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

Source: show | on GitHub 

     # File activerecord/lib/active_record/transactions.rb, line 231
231:     def transaction(options = {}, &block)
232:       self.class.transaction(options, &block)
233:     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
291:     def with_transaction_returning_status
292:       status = nil
293:       self.class.transaction do
294:         add_to_transaction
295:         status = yield
296:         raise ActiveRecord::Rollback unless status
297:       end
298:       status
299:     end