Imagine you have an Account model which has many transactions. calculable_attrs gem allows you to define Account#balance as SUM(transactions.amount) directly in your Account model. And solves n+1 problem for you in an elegant way.

Rails active record grouping with range

Instructure-maintained fork of delayed_job

Gem for generating Canvas models and migrations and syncing data from Canvas

Provide a Settings class to be used in Catarse that will store all data on a table containing key/value pairs.

This rails engine represents the core module for CATS applications

Asynchronously LISTEN for Postgresql NOTIFY messages with payloads and Do Something

Low level manipulation tool for Chef Infra Server

Low level manipulation tool for Chef Server 12 and later

Loads all records from the table on first use, and thereafter returns the cached (and frozen) records for all find calls. Optionally, creates class-level methods you can use to grab the records, named after the name field you specify.

This is a crawler framework.

Database exporter that prepares content to be imported

super-fast database cleaner

A Rails 4 ActiveRecord plugin that adds group_by_day, group_by_month, etc. Not timezone aware, but supports sqlite.

PostgreSQL DBI DBD

Automatically tests your Rails app for common database query mistakes

Tool for managing and executing your database migrations. It supports multiple databases and multiple languages for writing migration scripts.

Dead-simple gem for Rails 5 that allows to switch between database connections on-the-fly

Double entry accounting for Rails applications

Kafka libraries for Ruby.