Emojimmy makes it possible to store emoji characters in ActiveRecord datastores that don’t support 4-Byte UTF-8 Unicode encoding.

ActiveModel validator for emojis, powered by the unicode-emoji gem, to ensure your Models do not contain characters you may not be able to handle

Use migrations and simple syntax to manage constraints in PostgreSQL DB.

ActiveRecord concern to use EncodedID to turn IDs into reversible and human friendly obfuscated strings.

Encore provides serializers and persisters to build JSON API-compliant Web services with Ruby on Rails.

Enables Active Record attributes to point to enum like objects, by saving in your database only an integer ID.

Enum attributes with I18n and ActiveRecord support

Enumify lets you add an enum command to ActiveRecord models There are four things that the enumify gems adds to your model Validation - The enumify adds a validation to make sure that the field only receives accepted values Super Cool Methods - adds ? and ! functions for each enum value (canceled? - is it canceled, canceled! - change the state to canceled) Callback support - you can add a x_callback method which will be called each time the status changes Scopes - you can easily query for values of the enum

Adds enumerations to your models

Enum machine is a library for defining enums and setting state machines for attributes in ActiveRecord models and plain Ruby classes.

Allows ActiveRecord to better use PostgreSQL's ENUM types.

Elasticity provides a higher level abstraction on top of [elasticsearch-ruby](https://github.com/elasticsearch/elasticsearch-ruby) gem

Make your Ruby objects searchable with Elasticsearch.

Uses EXPLAIN to get an estimate count for an ActiveRecord::Relation

Database based event counter with throttling per time intervals

Everett is a substitute for Active Record Observer on Rails 5.

This concern maintains the illusion that a given object has specified attributes, when those attributes are in fact attached to an associated object. This is particularly useful for different classes within a single-table inheritance table to have access to separate fields in class-specific associations.

A zero-configuration logging solution for projects using Sidekiq, Rails, Sequel, etc.

facetq - "stand-alone" facet (activerecord) models for easy (re)use for sql database queries and more

Facteur allows you add a messaging system in your Rails 3. You can create many mailboxes for your users. They will be able to send and receive messages.