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Learning Mongoid

Learning
Gautam Rege

If you know MongoDB and Ruby, then Mongoid is a very handy tool to have at your disposal. Quickly learn to build Rails applications with the helpful code samples and instructions in this book.
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Book Details

ISBN 139781782167501
Paperback140 pages

About This Book

  • A step-by-step guide that explains how to use Mongoid through lots of examples and code
  • Monitor and fine-tune the performance of your application
  • Work with the MongoDB aggregation framework

Who This Book Is For

If you are an application developer who wants to learn how to use Mongoid in a Rails application, this book will be great for you. You are expected to be familiar with MongoDB and Ruby.

Table of Contents

Chapter 1: What's so Awesome about Mongoid?
A practical approach using the Sodibee library system
Notice about Mongoid 2.x
Mongoid and MongoMapper
Summary
Chapter 2: Mongoid Document Model
The Mongoid document
Embedded documents
Localization
Mass assignment and security
Summary
Chapter 3: Persisting Documents
MongoDB persistence strategy
Validations
Callbacks
Summary
Chapter 4: Mongoid Relations
Configuring relationships
has_one – the one-to-one relation
has_many – the many-to-one relation
The belongs_to relation
has_and_belongs_to_many – the many-to-many relation
Polymorphic relations
embeds_many – embedding many documents
embeds_one – embed one document
embedded_in – resolving children
Embedded polymorphic relations
Summary
Chapter 5: Mongoid Queries
Origins of Origin
Query selectors
Mongoid criteria
Queries on arrays and hashes
Atomic modifiers
Querying with indexed fields
The aggregation framework
Geolocation queries
Summary
Chapter 6: Performance Tuning
MongoDB environment
Indexes
IdentityMap
MapReduce and the aggregation framework
Monitoring query performance
Good practices and recommendations
Summary
Chapter 7: Mongoid Modules
Timestamping
Versioning
Paranoia
Acts as state machine (aasm)
Summary

What You Will Learn

  • Learn the syntax of Mongoid 4 with Rails 4
  • Understand moped, the new Ruby driver for MongoDB Learn about document relations in Mongoid
  • Understand origin, the new querying DSL
  • Manage indexes in Mongoid
  • Learn about gems that work with Mongoid
  • Tune and monitor performance

In Detail

Mongoid helps you to leverage the power of schema-less and efficient document-based design, dynamic queries, and atomic modifier operations. Mongoid eases the work of Ruby developers while they are working on complex frameworks.

Starting with why and how you should use Mongoid, this book covers the various components of Mongoid. It then delves deeper into the detail of queries and relations, and you will learn some tips and tricks on improving performance. With this book, you will be able to build robust and large-scale web applications with Mongoid and Rails.

Starting with the basics, this book introduces you to components such as moped and origin, and how information is managed, learn about the various datatypes, embedded documents, arrays, and hashes. You will learn how a document is stored and manipulated with callbacks, validations, and even atomic updates. This book will then show you the querying mechanism in detail, right from simple to complex queries, and even explains eager loading, lazy evaluation, and chaining of queries. Finally, this book will explain the importance of performance tuning and how to use the right indexes. It also explains MapReduce and the Aggregation Framework.

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