RailsAuditLog

Audit logging for Rails. Tracks create, update, and destroy events as structured JSON records with a mountable web dashboard, whodunnit actor context, batch writes, time-travel reconstruction, and test helpers — a clean, well-documented replacement for PaperTrail with a built-in migration path.

Table of contents

• Installation
• Configuration
• Web dashboard
• Usage
  • Tracking a model
  • Recording who made the change
  • Actor context outside of controllers
  • Querying the audit log
  • Lightweight queries
  • Association tracking
  • Bulk audit writes
  • Async audit writes
  • Capping history per record
  • Time-based retention
  • Scheduled and manual pruning
  • Selective tracking
  • Disabling auditing
  • Object reconstruction
  • Attaching a reason
  • Arbitrary metadata
  • Request metadata capture
  • Actor display name snapshot
  • Object snapshot storage
  • Separate audit database
  • Test helpers
• Stability and versioning
• Migrating from PaperTrail
• Performance
• Companion gems
• Requirements
• Contributing
• License

Installation

↑ Table of contents

Add to your Gemfile:

gem "rails_audit_log"

Run the install generator to create the migration:

bin/rails generate rails_audit_log:install
bin/rails db:migrate

Configuration

↑ Table of contents

Run the initializer generator to create config/initializers/rails_audit_log.rb with every option documented as a commented example:

bin/rails generate rails_audit_log:initializer

The generated file (shown below with all options) uses the block-style configure API. Every setting has a sensible default — uncomment only what you need:

# config/initializers/rails_audit_log.rb

RailsAuditLog.configure do |config|
  # Global columns excluded from all audited models.
  # Default: ["updated_at"]
  # config.ignored_attributes = %w[updated_at cached_at]

  # Store a full attribute snapshot alongside object_changes.
  # Default: true
  # Disable to save storage; reify and version_at fall back to diff-only reconstruction.
  # config.store_snapshot = false

  # Capture remote_ip and user_agent into each entry's metadata column.
  # Default: false — requires RailsAuditLog::Controller in ApplicationController.
  # config.capture_request_metadata = true

  # Customise how the actor's display name is stored at write time.
  # Default: actor.name if available, otherwise actor.to_s
  # config.whodunnit_display = ->(actor) { actor.email }

  # Global cap on entries retained per tracked record. nil = no limit.
  # Per-model `audit_log version_limit: N` takes precedence.
  # config.version_limit = 100

  # Global time-based TTL — entries older than this duration are pruned after
  # each write. Composes with version_limit: an entry is removed when it
  # exceeds either constraint. Default: nil (no TTL)
  # config.retention_period = 90.days

  # Write all audit entries asynchronously via WriteAuditLogJob.
  # Default: false — per-model `audit_log async: true` also works.
  # config.async = true

  # Route AuditLogEntry to a dedicated database (Rails multi-DB).
  # config.connects_to = { database: { writing: :audit_log, reading: :audit_log } }

  # Entries per page in the web dashboard. Default: 25
  # config.page_size = 50

  # Gate web dashboard access. Block runs in controller context so controller
  # helpers like current_user are available directly. Falls back to HTTP Basic
  # auth when the block returns falsy. Leave unset for unauthenticated access.
  # config.authenticate { current_user&.admin? }
  # config.authenticate { |c| c.current_user&.admin? }
end

Each option is documented in detail in its own Usage section below.

Web dashboard

↑ Table of contents

Mount the engine in config/routes.rb to enable the built-in audit trail browser:

mount RailsAuditLog::Engine, at: "/audit"

Then visit /audit to browse all audit entries. The dashboard is delivered via propshaft, importmaps, and CDN-pinned Turbo and Stimulus — no asset pipeline configuration required in the host app.

Usage

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Tracking a model

Include RailsAuditLog::Auditable in any ActiveRecord model:

class Article < ApplicationRecord
  include RailsAuditLog::Auditable
end

Every create, update, and destroy is now recorded automatically:

article = Article.create!(title: "Hello")
article.audit_log_entries.count       # => 1
article.audit_log_entries.first.event # => "create"

article.update!(title: "World")
article.audit_log_entries.last.object_changes
# => { "title" => ["Hello", "World"] }

Recording who made the change

Include RailsAuditLog::Controller in your ApplicationController and declare the actor source once:

class ApplicationController < ActionController::Base
  include RailsAuditLog::Controller
  audit_log_actor { current_user }
end

The actor is captured automatically on every request and stored on each entry:

entry = article.audit_log_entries.last
entry.actor       # => #<User id: 42, name: "Alice">
entry.actor_type  # => "User"
entry.actor_id    # => 42

Actor context outside of controllers

Use RailsAuditLog.with_actor in background jobs, rake tasks, or seeds:

RailsAuditLog.with_actor(current_user) do
  article.update!(status: "published")
end

Querying the audit log

# Event scopes
article.audit_log_entries.created_events
article.audit_log_entries.updated_events
article.audit_log_entries.destroyed_events

# Filter by actor, resource, or time
RailsAuditLog::AuditLogEntry.by_actor(current_user)
RailsAuditLog::AuditLogEntry.for_resource(Article)
RailsAuditLog::AuditLogEntry.for_resource(article)
RailsAuditLog::AuditLogEntry.since(1.week.ago)
RailsAuditLog::AuditLogEntry.until(Date.yesterday)

# Find entries that touched a specific attribute
RailsAuditLog::AuditLogEntry.touching(:title)

# Inspect what changed
entry = article.audit_log_entries.last
entry.changed_attributes  # => ["title"]
entry.diff
# => { "title" => { from: "Hello", to: "World" } }

Lightweight queries

Use .slim to exclude the three JSON blob columns (object_changes, object, metadata) from the SQL projection. This is useful for index or listing views where you only need the entry header (who, what event, when):

entries = AuditLogEntry.slim.for_resource(article).since(1.week.ago)
entries.first.event          # => "update"
entries.first.actor_type     # => "User"
entries.first.object_changes # => raises ActiveModel::MissingAttributeError

Note: Use .count(:id) instead of .count when chaining .slim with other scopes — Rails' COUNT with a multi-column SELECT is not supported by all databases.

Association tracking

Track has_many add and remove events by passing associations: true to audit_log. Call audit_log before the has_many declarations so the callbacks are wired at class load time:

class Post < ApplicationRecord
  include RailsAuditLog::Auditable
  audit_log associations: true
  has_many :tags
  has_many :comments, dependent: :destroy
end

Each add or remove creates an update entry on the parent with the associated record's identity in object_changes:

post = Post.create!(title: "Hello")
tag  = post.tags.create!(name: "Ruby")

entry = post.audit_log_entries.updated_events.last
entry.object_changes
# => { "tags" => [nil, { "id" => 1, "type" => "Tag" }] }

post.tags.delete(tag)
entry = post.audit_log_entries.updated_events.last
entry.object_changes
# => { "tags" => [{ "id" => 1, "type" => "Tag" }, nil] }

Track only a named subset of associations:

audit_log associations: [:tags]  # comments changes are not recorded

has_many :through and has_and_belongs_to_many work the same way — no extra configuration:

class Post < ApplicationRecord
  include RailsAuditLog::Auditable
  audit_log associations: true
  has_many :taggings
  has_many :tags, through: :taggings   # tracked automatically
  has_and_belongs_to_many :categories  # tracked automatically
end

belongs_to foreign-key changes are already tracked as regular column updates and require no extra configuration.

Bulk audit writes

Wrap a block with RailsAuditLog.batch_audit to buffer all audit entries and flush them in a single insert_all! call at the end, eliminating N+1 inserts during imports:

RailsAuditLog.batch_audit do
  records.each { |attrs| Post.create!(attrs) }
end
# All audit entries written in one INSERT

Nested calls accumulate into the outermost batch — only one insert_all! fires. If the block raises, the buffer is discarded and no entries are written.

Note: Version pruning (version_limit) is deferred in batch mode — the next write outside the batch will trigger pruning as usual.

Async audit writes

Offload audit writes to a background job by passing async: true to audit_log. The entry is enqueued via RailsAuditLog::WriteAuditLogJob (a subclass of ActiveJob::Base) so the request does not block on the database write:

class Post < ApplicationRecord
  include RailsAuditLog::Auditable
  audit_log async: true
end

Enable async globally in an initializer — per-model async: true takes precedence:

# config/initializers/rails_audit_log.rb
RailsAuditLog.async = true

Configure the queue adapter and queue name through standard ActiveJob settings. Version pruning also runs inside the job when version_limit is set.

Capping history per record

Limit how many audit entries are kept per record with version_limit:. Oldest entries are pruned automatically after each write once the cap is reached:

class Post < ApplicationRecord
  include RailsAuditLog::Auditable
  audit_log version_limit: 10  # keep only the 10 most recent entries
end

Set a global default in an initializer — per-model values take precedence:

# config/initializers/rails_audit_log.rb
RailsAuditLog.version_limit = 50

Time-based retention

Automatically prune entries older than a configured duration by setting retention_period in an initializer:

# config/initializers/rails_audit_log.rb
RailsAuditLog.retention_period = 90.days

Entries whose created_at is older than the period are deleted after each write. retention_period and version_limit compose — an entry is pruned when it exceeds either constraint.

Override the global default per model with retain_for::

class Post < ApplicationRecord
  include RailsAuditLog::Auditable
  audit_log retain_for: 30.days  # takes precedence over RailsAuditLog.retention_period
end

Scheduled and manual pruning

RailsAuditLog::PruneAuditLogJob prunes all audited models in one pass. It iterates over every item_type present in audit_log_entries, resolves the effective retain_for / retention_period and version_limit per model, and deletes entries that exceed either constraint.

Enqueue it on a recurring schedule via your job backend:

# config/recurring.yml (Solid Queue)
prune_audit_log:
  class: RailsAuditLog::PruneAuditLogJob
  schedule: every day at midnight

Or run it once manually via the rake task:

bin/rails rails_audit_log:prune

Selective tracking

Track only specific attributes, or exclude noisy ones:

class Article < ApplicationRecord
  include RailsAuditLog::Auditable

  # Track only these columns
  audit_log only: [:title, :status]

  # Or exclude specific columns
  audit_log ignore: [:cached_at, :views_count]
end

Configure global defaults in an initializer:

# config/initializers/rails_audit_log.rb
RailsAuditLog.ignored_attributes = %w[updated_at cached_at]

Updates that produce no tracked changes after filtering are silently skipped.

Disabling auditing

Suppress all audit writes inside a block — thread-safe, works in jobs and imports:

RailsAuditLog.disable do
  Article.insert_all!(bulk_rows)
end

RailsAuditLog.enabled? # => true (restored after the block)

Disable on a specific record instance:

article.skip_audit_log { article.update!(cached_at: Time.current) }

Object reconstruction

Reify a single entry — AuditLogEntry#reify returns an unsaved ActiveRecord instance reflecting the record's state before the entry was recorded:

article.update!(title: "v2")
entry = article.audit_log_entries.updated_events.last

previous = entry.reify
previous.title      # => "v1"  (the pre-update state)
previous.persisted? # => false

Returns nil for create entries (nothing existed before).

Reconstruct state at any point in time:

snapshot = RailsAuditLog.version_at(article, 1.week.ago)
snapshot.title  # => whatever the title was a week ago

Returns nil if the record had no history at that time or was already destroyed.

Navigate the version chain:

entry = article.audit_log_entries.updated_events.last
entry.previous  # => the entry before this one
entry.next      # => the entry after this one (nil if last)

Attaching a reason

Record a free-text rationale alongside any write using a thread-local block — safe to nest, cleared automatically:

RailsAuditLog.audit_log_reason("Approved by legal") do
  contract.update!(status: "approved")
end

entry.reason  # => "Approved by legal"

Arbitrary metadata

The metadata JSON column accepts any key/value hash. Populate it automatically with audit_log meta::

class Article < ApplicationRecord
  include RailsAuditLog::Auditable

  # Zero-arg lambda — evaluated at write time (good for thread-locals)
  # One-arg lambda — receives the record instance
  audit_log meta: {
    tenant_id:    -> { Current.tenant.id },
    title_length: ->(record) { record.title.length }
  }
end

entry.metadata  # => { "tenant_id" => "acme", "title_length" => 12 }

Request metadata capture

Enable opt-in capture of remote_ip and user_agent from the current request in an initializer:

# config/initializers/rails_audit_log.rb
RailsAuditLog.capture_request_metadata = true

When enabled, the Controller concern automatically stores these into each entry's metadata column:

entry.metadata  # => { "remote_ip" => "203.0.113.1", "user_agent" => "Mozilla/5.0 ..." }

Request metadata and audit_log meta: values are merged together automatically.

Actor display name snapshot

whodunnit_snapshot stores the actor's display name at write time so entries remain meaningful even after the actor record is deleted:

entry.whodunnit_snapshot  # => "Alice"  (even if the User record is later deleted)

The default display proc uses actor.name if available, otherwise actor.to_s. Override globally in an initializer:

RailsAuditLog.whodunnit_display = ->(actor) { actor.email }

Object snapshot storage

By default every entry stores a full object snapshot of the pre-change state alongside object_changes. This makes reify and version_at reliable without any database lookups:

entry.object          # => { "id" => 1, "title" => "v1", ... }
entry.object_changes  # => { "title" => ["v1", "v2"] }

To save storage at the cost of reduced reification accuracy, switch to diff-only mode:

RailsAuditLog.store_snapshot = false

Separate audit database

Route all audit writes to a dedicated database by setting connects_to in an initializer. The engine applies it to AuditLogEntry at boot:

# config/initializers/rails_audit_log.rb
RailsAuditLog.connects_to = {
  database: { writing: :audit_log, reading: :audit_log }
}

The key (e.g. :audit_log) must match a database key in config/database.yml. All reads and writes on AuditLogEntry — including batch_audit inserts and WriteAuditLogJob — use that connection automatically.

Test helpers

RailsAuditLog::TestHelpers — silences audit tracking inside a block; useful in FactoryBot factories and seed data:

# spec/rails_helper.rb
require "rails_audit_log/test_helpers"

RSpec.configure do |config|
  config.include RailsAuditLog::TestHelpers
end

# Or in a FactoryBot factory:
after(:create) { |p| without_audit_log { p.update!(cached_at: Time.current) } }

without_audit_log is a prefix-free wrapper around RailsAuditLog.disable — thread-safe and restores tracking even if the block raises.

RailsAuditLog::Matchers (RSpec) — add to spec/rails_helper.rb:

require "rails_audit_log/matchers"

RSpec.configure do |config|
  config.include RailsAuditLog::Matchers
end

expect(post).to have_audit_log_entry
expect(post).to have_audit_log_entry(:update)
expect(post).to have_audit_log_entry(:update).touching(:title)

expect { post.update!(title: "New") }.to create_audit_log_entry(event: :update).touching(:title)

RailsAuditLog::MinitestAssertions — add to test/test_helper.rb:

require "rails_audit_log/minitest_assertions"

class ActiveSupport::TestCase
  include RailsAuditLog::MinitestAssertions
end

assert_audit_log_entry post, event: :update, touching: :title
refute_audit_log_entry post, event: :destroy

Stability and versioning

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rails_audit_log follows Semantic Versioning from 1.0.0. The public API is everything documented in this README. Anything not listed here is internal and may change between minor versions.

Version bump	Meaning
Patch (1.0.x)	Bug fixes only — no API changes
Minor (1.x.0)	New features, backward-compatible
Major (x.0.0)	Breaking changes with a documented migration path

Public API surface

Module-level — RailsAuditLog

Method / accessor	Purpose
`.configure { \	config\
.with_actor(actor) { }	Set whodunnit context for a block
.disable { }	Suppress all audit writes for a block
.enabled?	Whether audit writes are active
.audit_log_reason(value) { }	Attach a free-text reason for a block
.batch_audit { }	Buffer writes and flush with a single insert_all!
.version_at(record, time)	Reconstruct record state at a point in time
.authenticate { }	Gate web dashboard access
.ignored_attributes=	Global columns excluded from all models
.store_snapshot=	Store full object snapshot alongside diffs
.capture_request_metadata=	Capture remote_ip and user_agent
.version_limit=	Global entry cap per record
.async=	Write audit entries via WriteAuditLogJob
.connects_to=	Route AuditLogEntry to a separate database
.page_size=	Entries per page in the web dashboard
.whodunnit_display=	Proc for actor display name snapshot
.retention_period=	Global time-based TTL for audit entries

Concerns

Class	Include in	Key methods
RailsAuditLog::Auditable	ActiveRecord models	audit_log(only:, ignore:, meta:, associations:, version_limit:, retain_for:, async:), skip_audit_log { }
RailsAuditLog::Controller	ActionController	audit_log_actor { }

Model — RailsAuditLog::AuditLogEntry

Scopes: created_events, updated_events, destroyed_events, by_actor, for_resource, since, until, touching, slim, for_period

Instance methods: reify, previous, next, diff, changed_attributes, actor

Constants: EVENTS, BLOB_COLUMNS, PERIODS

Testing helpers

Module	Require	Usage
RailsAuditLog::Matchers	require "rails_audit_log/matchers"	RSpec: have_audit_log_entry, create_audit_log_entry
RailsAuditLog::MinitestAssertions	require "rails_audit_log/minitest_assertions"	Minitest: assert_audit_log_entry, refute_audit_log_entry
RailsAuditLog::TestHelpers	require "rails_audit_log/test_helpers"	without_audit_log { }

Jobs (configure via ActiveJob)

RailsAuditLog::WriteAuditLogJob — do not instantiate directly; enqueued when async: true is set.

RailsAuditLog::PruneAuditLogJob — enqueue on a schedule to prune all audited models; also invoked by bin/rails rails_audit_log:prune.

Generators

rails generate rails_audit_log:install · rails generate rails_audit_log:initializer

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Migrating from PaperTrail

↑ Table of contents

Run the migration generator to produce a timestamped data migration:

bin/rails generate rails_audit_log:migrate_from_paper_trail
bin/rails db:migrate

The generated migration reads every row from PaperTrail's versions table and inserts it into audit_log_entries.

Column mapping

PaperTrail versions	audit_log_entries	Notes
item_type	item_type	Direct copy
item_id	item_id	Direct copy
event	event	create / update / destroy only; other values are skipped
object_changes	object_changes	YAML or JSON → JSON (see below)
object	object	YAML or JSON → JSON (see below)
whodunnit	whodunnit_snapshot	PaperTrail stores actor as a plain string
created_at	created_at	Direct copy
—	actor_type / actor_id	Not populated — cannot be inferred from a string whodunnit

YAML and JSON serialization

PaperTrail serializes object and object_changes as YAML by default and as JSON when PaperTrail.serializer = PaperTrail::Serializers::JSON is configured. The migration handles both transparently — it tries JSON first, then falls back to YAML (with a permissive class list for the Ruby types PaperTrail commonly serializes).

Compatibility shim for gradual migration

If you need your codebase to keep using PaperTrail's API while migrating, include RailsAuditLog::PaperTrailCompat alongside Auditable:

require "rails_audit_log/paper_trail_compat"

class Article < ApplicationRecord
  include RailsAuditLog::Auditable
  include RailsAuditLog::PaperTrailCompat
end

This adds the familiar PaperTrail surface:

article.versions                          # audit_log_entries ordered oldest-first
article.paper_trail.version               # most recent AuditLogEntry
article.paper_trail.previous_version      # reconstructed previous state (reify)
article.paper_trail.originator            # whodunnit_snapshot string
article.paper_trail.version_at(1.week.ago) # reconstructed state at a point in time

AuditLogEntry#reify already matches PaperTrail's Version#reify — no additional alias needed.

What is not migrated

• versions rows with an event value outside create, update, destroy (custom events added by some apps)
• actor_type and actor_id — PaperTrail's whodunnit is a plain string and does not identify the actor model

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Companion gems

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Coming in the 1.x series

Gem	What it adds
rails_audit_log-graphql	Mountable GraphQL endpoint at /audit/graphql — queryable audit trail for API-first apps without forcing graphql-ruby on users who don't need it

Each companion gem declares rails_audit_log as a dependency so you only add what you use.

Requirements

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• Ruby >= 3.3
• Rails >= 7.2

Performance

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See BENCHMARKS.md for write throughput, batch_audit gains, query performance, storage efficiency, and notes on comparing against PaperTrail. To run the suite locally:

bundle exec rake dev:setup
bundle exec rake benchmark

Contributing

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Bug reports and pull requests are welcome on GitHub.

License

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The gem is available as open source under the terms of the MIT License.