Let you define an auto-incremented field in Mongoid, which will behave like SQL id field.

a mongoid 3/moped compatible lock implementation and mixin

Validate bulk insert in mongoid

Cache Methods in any Mongoid Document

Adds support for caching Mongoid documents as a field within other Mongoid documents, with complete control over which fields to cache.

A simple mongoid extention that allows any application using mongoid to manage permissions based roles.

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

Create and maintain aggregate metadata with Mongoid

Mongoid Counter Cache extension: counter cache with categorized count

A simple logger for mongoid

Provides improved cloning features for Mongoid

Mongoid support for sorting with collation

Mongoid models are saved in one collection by default. However, when collections after too large , it could be extracted into a separated one and query form that, to make it query faster

Easy maintenence of collections of processed data in MongoDB with the Mongoid ODM.

A simple counter cache implemented for mongoid, with neat additions such as lambda evaluation

Mongoid Counter Cache

It adds possibility for criteria callbacks (data filters)

Add crypt field for mongoid document

A gem used to clone a Mongoid object with its associations

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