rails-transactions

Atomic database updates across multiple models use ActiveRecord::Base.transaction to wrap operations so all changes complete together or all roll back on error. This guarantees data integrity when coordinating debit and credit, inventory adjustments, or other dependent updates.

When an error occurs inside a transaction, Rails automatically rolls back all database changes made within that block, returning the database to its state before the transaction started. You can rescue exceptions and perform compensating actions or re-raise to trigger rollback.

Rails supports nested transactions through savepoints, which allow you to wrap operations inside an outer transaction. Inner transaction rollbacks undo only their changes without affecting the outer transaction, enabling granular error handling across multi-step operations.

Isolation levels in Rails transactions control how concurrent database operations interact, ranging from read uncommitted to serializable. Configurable isolation prevents dirty reads, non-repeatable reads, and phantom reads depending on your consistency requirements and concurrency load.

Database locking with transactions prevents concurrent modifications during multi-step operations like fund transfers or inventory updates. Explicit locks ensure consistent reads and writes when multiple processes access the same records simultaneously.

Yes, Rails transactions are designed for fund transfers, inventory updates, and other scenarios requiring all-or-nothing execution across multiple models. Transaction atomicity guarantees both operations succeed or both fail, preventing inconsistent states.