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A free scan shows the junk files, broken settings and background clutter dragging Windows down - then fixes them in one click.Free scan · Windows 10 & 11A Rails rollback undoes database changes made in the transaction; it does not automatically reverse an API request already accepted by another service or retract an email already sent. A queued job is less predictable: the outcome depends on when it was enqueued, which queue adapter is active, and whether the queue shares the application database. Trace those events separately to find out what actually happened.
What a rollback does—and does not—undo
An Active Record transaction governs database work on its connection. It is not a distributed transaction spanning your database, an API provider, an email service, and a job queue. Rails recommends transaction callbacks for coordinating with systems outside the database transaction: Rails Active Record Callbacks.
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Think of the incident as a sequence of separate events: database writes, an external request or synchronous delivery, queue insertion, and eventual job execution. A rollback establishes what happened to the database transaction. It does not, by itself, establish whether another system received or acted on a request.
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- Database changes: Changes in a rolled-back transaction are not committed.
- External API: A provider may have accepted a request before Rails rolled back. The rollback cannot recall it.
- Email: A message accepted for delivery cannot be unsent by a later rollback.
- Job: Queue insertion and job execution are separate events; whether insertion participates in the transaction depends on configuration.
Where was the side effect in the transaction timeline?
Inline code or a pre-commit callback
If code calls an API, sends mail, or enqueues work before the transaction commits, that action may already have happened when a later exception causes rollback. An ordinary model callback that runs before commit does not make the external action part of the database transaction.
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Rails illustrates the risk with file deletion: deleting a file before the database transaction is safely committed can leave the file and database out of sync if the transaction later rolls back. An API call or immediate email has the same basic problem—the database cannot reverse an effect owned by another system.
after_commit
Use after_commit when an action should run only after the database change has committed. Rails also supports transaction-object callbacks and ActiveRecord.after_all_transactions_commit, which waits for the outermost currently open transaction and does not run if an open transaction rolls back. See the Rails callback guide for callback behavior and usage.
There is an important trade-off: after_commit runs after the data is already persisted, and its code is not part of the completed transaction. If it raises, the commit remains in place. Rails also warns that an exception can bubble up and prevent remaining transaction callbacks from running. Handle failures deliberately—log them, rescue where appropriate, and provide a retry or recovery path for important effects.
after_rollback
Use after_rollback for cleanup or compensating work that should follow a rollback. It does not automatically reverse a successful remote operation; your application must define what corrective action is appropriate.
Why job enqueueing depends on the queue setup
Active Job does not make every enqueue operation transactional. Rails documents a specific case where Solid Queue uses the same database as application records: the enqueue can participate in the Active Record transaction, so a rollback means no job enqueue. In that setup, a failed enqueue can also prevent the transaction from committing. But Rails 8 configures Solid Queue on a separate database by default, so do not assume the same-database behavior without checking the deployed configuration. See Rails Active Job Basics.
To make the intended timing explicit, Rails documents setting enqueue_after_transaction_commit = true for a job or globally. An after_commit callback is another option. Without a commit deferral, a job may be enqueued even if a later rollback occurs; it may also start before another connection can see the uncommitted row it needs.
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Check the Rails version, Active Job adapter, actual queue backend, queue database topology, and enqueue-after-commit setting in the environment where the incident occurred. Defaults and behavior are not interchangeable across deployments.
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Immediate email and queued email are different cases
deliver_now
deliver_now sends synchronously. If the mail provider accepts the message before the transaction rolls back, the rollback cannot retract it. Confirm delivery using the mail provider’s response or message records rather than inferring it from the database outcome.
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deliver_later
deliver_later enqueues an Action Mailer delivery job through Active Job. Follow the queue-insertion rules above, then check whether the job ran and whether the mail provider accepted the message. A queue record alone does not prove the email was delivered. Rails documents the distinction in its Active Job guide.
Quick Recap
Diagnose the incident in order
- Establish the database outcome. Correlate the exception and Rails logs with transaction instrumentation. Rails exposes transaction outcome values such as commit or rollback; they describe the database side, not the result at an API or mail provider. See Active Record Transactions.
- Locate the side effect. Find whether the API call or delivery ran inline, in a pre-commit callback, in
after_commit, or inside a job. Identify the exact code path that executed before the exception. - Check queue configuration. Record the Rails version, Active Job adapter, queue backend, whether Solid Queue and application records use the same database, and the effective
enqueue_after_transaction_commitsetting. Inspect queue and job logs for insertion, execution, and failure. - Verify external outcomes. Look for the API response, request log, provider receipt, email message ID, or reconciliation record. Correlate timestamps and identifiers with Rails logs. Rails cannot determine whether an unobserved remote request succeeded.
- Inspect nested transactions. Ordinary nested transaction calls join the parent transaction rather than opening an independent database transaction. With
requires_new: true, Rails can use a savepoint-backed nested transaction. Distinguish a savepoint rollback from a rollback of the outer transaction; see Active Record Transactions. - Make recovery safe. Where the API supports it, use an idempotency key so retrying does not duplicate an operation. Configure job retry or discard behavior explicitly and make repeated execution safe; Rails notes that failed jobs are not retried unless configured. If a remote action succeeded but the database did not commit, use a deliberate compensating action or reconciliation process rather than assuming rollback repaired the remote state.
Choose the mechanism that matches the required guarantee
| Approach | When the action happens | What a later rollback means | Main failure concern |
|---|---|---|---|
Inline API call or deliver_now |
During the transaction’s execution | Cannot reverse an action already accepted externally | Database and remote state can diverge; retries may duplicate effects |
| Enqueue before commit | Before the outer transaction commits | Depends on adapter and database topology; an external queue may retain the job | Job may run before its required database row is visible |
after_commit or enqueue-after-commit |
After successful commit | Rollback prevents the deferred action from running | Callback or enqueue failure occurs after data is committed and needs visibility and recovery |
| Same-database Solid Queue transaction | Queue insertion can share the database transaction | Rollback removes the enqueue with the transaction | Applies only when queue and application records share that database |
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