Consort allows you to define relationships between various ORM/ODMs and access them similarly to ActiveRecord associations.

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.

Dynamic scopes by convention for ActiveRecord 3

copycats - command line tool (and core library) crypto cats / kitties collectibles unchained - buy! sell! hodl! sire! - play for free - runs off the blockchain w/ ledger lite - no ether / gas required; run your own peer-to-peer (P2P) network node over HTTP

Help correlate individual documents in a No/Less-SQL environment

Replacement for ActiveRecord belongs_to :counter_cache with ability to specify conditions.

A general purpose Rails utility plugin.

ActiveRecord plugin for cursor based pagination. Uses some column and rpp (results per page) to paginate your content. The main advantage against traditional pagination (limmit and offset), that the one URL on specific page will contain the data set, despite the newly added entities. It may be useful on the projects, where new entities are added often, and specific page now isn't specific page tomorrow.

This gem delivers a simple DSL based on the after_commit callback which can be used as an alternative to hooks from inside the model

This is a crawler framework.

includes_count_of method on ActiveRecord::Relation to solve N+1 query problem when counting associated records

super-fast database cleaner

Finds leaky ActiveRecord models in your specs.

Simple blog system built up with Sinatra.

db2fog provides rake tasks for backing up and restoring your DB to cloud storage providers

dbbrowser - database browser (connections, schema, tables, records, etc.) as mountable web app

Automatically tests your Rails app for common database query mistakes

Obtain manual db locks to guard blocks of code from parallel execution.Supports mysql, postgres and ms-sql-server.

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

Set default values for ActiveRecord attributes