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Squeel unlocks the power of ARel in your Rails 3 application with a handy block-based syntax. You can write subqueries, access named functions provided by your RDBMS, and more, all without writing SQL strings. I'm trying to push a version of this gem, so that bundler doesn't screw up with the :git included versions.

Write-through and Read-through Cacheing for ActiveRecord

Provide simple helpers on persist values in redis for performance. Works with ActiveRecord.

Stackflame provides a simple API to deal with Flamegraph of stackprof.

Stackify APM for Ruby

Fancy redis-backed caches

This gem is a thin wrapper of stackprof and provides simple API to see profiling result quickly.

A transactional outbox implementation for Ruby/ActiveRecord

ActiveRecordを単体で動かす時に使う起動処理

A thin wrapper to use Rails Migrations in non Rails projects

StarKit Banking Interface

A tiny library for making ActiveRecord models into state machines

Easily add state to Poro and ActiveRecord 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