Use whatever monitor service you would like to track strong parameter errors.

Gem for removing empty strings in arrays in params.

params_sanitizer sanitize parameter.It is really easy and useful.

Map query params to model scopes, pairing one or more keys to a scope. Parameters can be required, or whitelisted providing fine tuned control over how scopes are run.

PatchPatch changes Rails’ default behavior of mapping PUT and PATCH requests on resources to the same action.

rewrite rails generate url and route.

Reusable utilities for Ruby and Rails

Interact with the Gateway, 3DS, Kount, and FraudPortal

PeijiSan is a Rails plugin which uses named scopes to create a thin pagination layer.

An easy way to add common finders to your Rails controllers.

A Ruby on Rails authorization gem

Expandable object oriented authorization solution for Ruby/Rails applications

Persist your params in session so they are used the next time you call the same controller/action. Works with HasScope.

Personage lets your manage your user sessions.

Fake a Rails 3 site to a PHP site

Read/write php session file from Ruby on Rails

Identity and access management engine for Rails.

Currency classes that can represent GBP or Chips

Spice up your vanilla rails app with some SPA like benefits without the added complexity of a client-side JavaScript framework. From within javascript, there is no straightforward way (at least I'm aware of) to invalidate/reload a partial. Articles describing techniques such as this one have been around for some time now. This gem builds on techniques such as that one, and allows you to reload partials by following a few simple conventions.

Great for building APIs & reports