StandardAudit is a standalone Rails gem for database-backed audit logging. On Rails 8.1+ it subscribes to Rails.event; on Rails 8.0 it falls back to ActiveSupport::Notifications. Generic, flexible, and works with any Rails application.

StandardLedger captures the recurring 'append-only entry → N projection updates' pattern as a declarative DSL on host ActiveRecord models. Supports five projection modes — :inline, :async, :sql, :matview, :trigger — plus a deterministic rebuild path from the entry log, ad-hoc materialized view refresh, and a doctor rake task that verifies host-owned trigger presence. Enforces idempotency-by-unique-index and immutability at the entry level.

StarKit Banking Interface

A tiny library for making ActiveRecord models into state machines

Easily add state to Poro, ActiveRecord, and Sequel objects.

State management for ActiveRecord, with states; transitions; and just the right amount of syntactic sugar.

Statelogic does kinda this and that... you know.

I've found that when developing Rails apps, I tend to almost always pair each scope with an instance method which returns a boolean indicating whether the object is included inside that scope.\n\nThis gem simply automatically creates that method for you. Nothing super fancy, and you might consider replacing the state methods with your own, more efficient, implementations - but it's great for early stages of development, or providing a comparative case for unit tests.

Gem that adds functionality to statesman

Concern that makes it easy to define and enforce possibe state transitions for a field/object

exposes state machine method to run code after a transition is committed to the database

Builds a database of bank account transaction history by reading PDF bank statements, and provides a simple web interface for browsing data.

'State' Design Pattern from the Gang of Four book. Many other state machines focus on events and transitions. This state machine focuses on behavior and reducing conditional logic.

state_shifter is a gem that adds state machine behavior to a class

StatesmanScaffold generates StateMachine, Transition classes, and migrations for ActiveRecord models using the Statesman gem. Includes a WithStateMachine concern that wires up state machine delegation, query scopes, and transition associations with a single `with_state_machine` class macro.

Create a database trigger that keeps the most recent Statesman state in sync.

Manage JSON object in string typed attributes for ActiveRecord models

Static authentication && authorization in rails.

Basic functionality for models to get initialised with static data and make them accessible with common finder methods

Replace your key/value classes with this. Define classes with several 'singleton' instances.