schema_reaper scans a Rails + PostgreSQL app for schema debt that's easy to accumulate and hard to find by hand. It checks your live database against your codebase and flags three kinds of problems: things nothing references anymore (dead columns and dead tables), index trouble (indexes nobody queries, indexes made redundant by a wider index that already covers them, and foreign-key columns with no index at all), and degenerate data (columns that are always NULL, or hold the exact same value in every row). Every finding comes with a confidence score, an estimate of the disk space removing it would reclaim, and a concrete fix. For a column, that's a two-step migration: stop reading it first, then drop it once you've confirmed nothing broke. An optional runtime tracker can sample real production traffic to raise confidence further, for cases a static code scan alone can't settle. Reports come as a colored terminal summary, JSON, Markdown for a PR comment, or SARIF for GitHub code scanning -- plus a CI baseline gate and a trend log to track progress release over release. PostgreSQL only for now. Requires Ruby 2.7 or later. Full usage is in the README.

SchemaSerializer is provide serialization from schema definition to JSON.

Extends beyond traditional schema annotation to provide intelligent analysis and actionable suggestions for Rails model code quality, performance, and maintainability.

Automatic XSD generation from ActiveRecord models

Gem to set a schema to run migration.

Auto-generate Mermaid ERD markdown files from your ActiveRecord schema. Hooks into db:migrate to keep diagrams in sync.

Adds tracking of one off data scripts for Rails.

Schleuder is a group's email-gateway: subscribers can exchange encrypted emails among themselves, receive emails from non-subscribers and send emails to non-subscribers via the list. (Please note: For some platforms there's a better way of installing Schleuder than `gem install`. See <https://schleuder.org/schleuder/docs/server-admins.html#installation> for details.)

Helpful rspec matchers for testing validations and associations.

A simple and straightforward way to add slugs to ActiveRecod models.

Define todo scopes and recalculation transforms for ActiveRecord entities, inspired by Rake rules semantics.

RFC7644 SCIM (System for Cross-domain Identity Management) 2.0 filter parser. See https://tools.ietf.org/html/rfc7644#section-3.4.2.2 This gem implements a filter syntax parser as well as an optional integration for integrating the filter with an Arel table.

gem to auto update created and updated by for models.

Flexible Filtering for ActiveRecord

Easy testing of scope usage

Simple implementation of counter_cache functionality for model scopes

A rigid, readable alternative for defining AR scopes.

ScopedAssociations lets you create multiple `has_to` and `has_many` associations between two ActiveRecord models.

Group multiple enum values backed by ActiveRecord::Enum into scopes with ScopedEnum.

Provides a simple mapping between Active Record scopes and controller parameters for Ruby On Rails 4