Batch up your ActiveRecord "touch" operations for better performance. ActiveRecord::Base.delay_touching do ... end. When "end" is reached, all accumulated "touch" calls will be consolidated into as few database round trips as possible.

This gem automatically logs SQL EXPLAIN of every queries. You can check naturally every SQL EXPLAIN from development log, without manually executions.

ActiveRecord OpenTracing intrumenter

This gem adds comments to the SQL to indicate where the SQL parts are constructed.

This is an ActiveRecord connection adapter for the SpatiaLite extension to the Sqlite3 database. It is based on the stock sqlite3 adapter, but provides built-in support for spatial databases using SpatiaLite. It uses the RGeo library to represent spatial data in Ruby.

This gem changes ActiveRecord's query logs to be compatible with the sqlcommenter format.

Define attributes in arel

An implementation of repository pattern that can connect with any ORM

Sanitize SVG images after ActiveStorage upload

ActsAsFriendable provides a Friendship model, relevent scopes, and many instance methods to quickly and easily add Social Networking functionality to your Rails application.

ActiveRecord extension that provides revision support so that history can be tracked and changes can be reverted. Emphasis for this plugin versus similar ones is including associations, saving on storage, and extensibility of the model.

A ruby gem to handle multiple user roles on a Rails app, it also has Devise support

Add relational feature to Rails (e.g. follow, block and like).

Integrates Paperclip as a field for Administrate in Rails apps

Rails plugin with dyanmic I18n backend for good internationalization.

Throttling of ActiveRecord model creations.

Create Anki Flashcards with Ruby! Supports images, audio, HTML and CSS. Build multimedia *.apkg Flashcards for use with the Anki (http://ankisrs.net) Spaced Repetition Software (SRS)

A library that lets you export apkg packaged decks for Anki. Designed to deal with creation / exporting and not much else

Annotate your models and keep your comments about fields.

Add pagination info to the response headers, GitHub style.