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Download Learning Mongoid by Gautam Rege PDF

By Gautam Rege

ISBN-10: 1782167501

ISBN-13: 9781782167501

Build scalable, effective Rails internet purposes with Mongoid


  • A step by step advisor that explains how you can use Mongoid via plenty of examples and code
  • Monitor and fine-tune the functionality of your application
  • Work with the MongoDB aggregation framework

In Detail

Mongoid lets you leverage the facility of schema-less and effective document-based layout, dynamic queries, and atomic modifier operations. Mongoid eases the paintings of Ruby builders whereas they're engaged on advanced frameworks.

Starting with why and the way you can use Mongoid, this ebook covers a number of the elements of Mongoid. It then delves deeper into the aspect of queries and kinfolk, and you'll research a few advice and methods on bettering functionality. With this booklet, it is possible for you to to construct powerful and large-scale internet purposes with Mongoid and Rails.

Starting with the fundamentals, this publication introduces you to elements reminiscent of moped and foundation, and the way details is controlled, know about a number of the datatypes, embedded records, arrays, and hashes. you'll find out how a rfile is saved and manipulated with callbacks, validations, or even atomic updates. This ebook will then express you the querying mechanism intimately, correct from easy to advanced queries, or even explains keen loading, lazy assessment, and chaining of queries. ultimately, this e-book will clarify the significance of functionality tuning and the way to exploit the suitable indexes. It additionally explains MapReduce and the Aggregation Framework.

What you'll research from this book

  • Learn the syntax of Mongoid four with Rails 4
  • Understand moped, the hot Ruby motive force for MongoDB find out about rfile kin in Mongoid
  • Understand foundation, the hot querying DSL
  • Manage indexes in Mongoid
  • Learn approximately gem stones that paintings with Mongoid
  • Tune and display screen performance


A step by step instructional with targeted examples to help you construct scalable, excessive functionality Rails internet functions with Mongoid.

Who this booklet is written for

If you're an program developer who desires to use Mongoid in a Rails software, this booklet should be nice for you. you're anticipated to be accustomed to MongoDB and Ruby.

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Extra info for Learning Mongoid

Example text

Did you know ActiveModel::Callbacks include after_ initialize, after_find, after_touch, after_commit, and after_rollback? Of course, after_commit and after_rollback are specific to transactional databases unlike MongoDB. Mongoid also supports before_upsert, after_upsert, and around_upsert! As we have seen earlier, an upsert means "update if the document exists and create if it doesn't exist". However, there's more to callbacks in Mongoid. Mongoid also supports the after_add, after_remove, before_add, and before_remove callback for some specific relations.

Counter_cache: This option increments a cached counter atomically in the parent when a child is added or removed. • :index: This option indicates the indexed relation field. • :validate: True or false are the values for this option. This is true by default as we validate the relation for child objects. • :polymorphic: This option specifies whether the relation is a polymorphic relation. • :cyclic: This option specifies whether a relation is a cyclic embedded relation. • :cascaded_callbacks: This option invokes cascaded callbacks on embedded objects.

Fallbacks = true. It's pretty straightforward. First let's configure a localized field. class Book include Mongoid::Document #... field :currency, localize: true end Now we can play around with this localized field. save => true Now if we fetch the object again, we can see that the localized field is saved as a hash. first => #"GBP", "hi"=>"INR"}, author_id: nil> [ 29 ] Mongoid Document Model However, when we access the currency, we get the localized string and not the hash.

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