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.

Tiny MongoMapper plugin for treating a collection as a list

Simulator for Moneris Hosted Tokenization

An aggregation DSL for use with mongo ruby driver

A library to iterate over entire Mongo collections or large queries exposing an API to control things like batch size, order and limit.

MongoBlazer to flatten relational data from ActiveRecord Models into Mongodb Documents

Minimal set of classes and modules to help with activity tracking.

A simple little gem that makes it easy to handle case-insensitive alphabetizing for Mongoid document models

Mongoid Approbation

If you need a simple shopping cart handler for monogid project use this one :-)

Create and maintain aggregate metadata with Mongoid

Mongoid support for sorting with collation

A simple Mongoid 3 versioning system that works with embedded documents.

Able to do something like 'bookmark', 'like' or 'follow' with mongoid

Add and manipulate flags (boolean values) on mongoid models

Generate frequency maps using mongodb aggregations

Mongoid layer for the Sphinx fulltext search server that supports block fields and dynamic indexes

Prevent fields from being updated by including a mongoid module and marking the fields as immutable.

Storing IP in MongoDB done right - as integers

adding like and dislike behaviors to Mongoid user model