Arel is a Relational Algebra for Ruby. It 1) simplifies the generation complex of SQL queries and it 2) adapts to various RDBMS systems. It is intended to be a framework framework; that is, you can build your own ORM with it, focusing on innovative object and collection modeling as opposed to database compatibility and query generation.

Adds the missing outer_joins method to ActiveRecord

Restrict the values assignable to ActiveRecord attributes or associations

Automatically increments an ActiveRecord column

This gem adds to carrierwave a storage facility which will use the PostgreSQL's oid datatype to reference a large object residing in the databse. It supports up to 2GB files, though it's better suited for smaller ones. Makes life easier for fast prototyping and put all your data in the same place, allows one backup for all your data and file storage in heroku servers.

Gems main responsibility is to provide service for copying Carrierwave files between records

Power tools for ActiveRecord relations (scopes)

integrate the elastic search engine with rails

Preseed reusable data for factory girl

Adds query origin tracing to your logs.

FixtureBot gives you a Ruby DSL that feels like FactoryBot, backed by the speed of Rails fixtures. Define your test data in Ruby and generate standard YAML fixture files.

FixtureKit provides lightning-fast test setup by caching database records. Define fixtures using any tool (FactoryBot, raw ActiveRecord, etc.), and FixtureKit caches the SQL to replay in subsequent test runs.

https://github.com/tsukasaoishi/fresh_connection

Build Relay-compatible GraphQL schemas based on ActiveRecord models

Rails style structure for GraphQL API.

Instructure-maintained fork of delayed_job

Builds ActiveRecord outer joins from association paths and provides references to table aliases.

kaminari-grape connects Kaminari and Grape

Double entry bookkeeping with Rails

An extension for Lograge to log SQL queries