Before a record is saved, mm-optimistic_locking will check if it has been modified by another process. If so, a StaleDocumentError will be raised. The object can be reloaded and resaved after the conflict has been resolved.

Implementation of the acts as list gem for Mongoid

Please refer to http://rubygems.org/gems/mongo_followable for latest versions

Gives a method that can parse query string parameters into a set of criterias that Mongoid can use to perform actual queries in MongoDB databases for a given model.

Add a random key to all documents in a collection for random retrieval

Mongoid::Sequence2 gives you the ability to specify fields to behave like a sequence number (exactly like the "id" column in conventional SQL flavors).

Provides a simple way to add slug generation to a Mongoid model

A tiny mongoid extension to provide the `touch` method known from ActiveRecord to Mongoid::Document.

Add table-level database locking to ActiveRecord

MTWarden Rails 5.1 engine adds basecamp style user logins (multi-tenant authetication using warden gem) to your ruby on rails application.

The base engine for the muck system. Contains common tables, custom for, css and javascript.

ActiveRecord plugin designed to allow simple multiple table inheritance.

Allows you to save menu items in the database. You can create your own renderer.

Rails engine providing positive/negative ajaxful voting solution with FontAwesome integration and handful of additional features.

It changes ActiveRecord::Base#destroy to support soft delete. Kind of simple acts_as_paranoid.

Manage mailer templates via wysiwyg and liquid. Uses mercury editor for now. And send out newsletters.

Notifiable engine for Rails.

Engine providing key-value settings stored in db with a web UI.

a workflow orchestration framework running on delayed_job and active_record

A Rails engine for orcid.org integration.