Chapter 4: Working out your Way with Queries
by Gautam Rege
Ruby and MongoDB Web Development Beginner's Guide
- Ruby and MongoDB Web Development Beginner's Guide
- Ruby and MongoDB Web Development Beginner's Guide
- Credits
- About the Author
- Acknowledgement
- About the Reviewers
- www.PacktPub.com
- Preface
- 1. Installing MongoDB and Ruby
- Installing Ruby
- Installing MongoDB
- Configuring the MongoDB server
- Starting MongoDB
- Stopping MongoDB
- The MongoDB CLI
- Installing Rails/Sinatra
- Summary
- 2. Diving Deep into MongoDB
- Creating documents
- Time for action — creating our first document
- Using MongoDB embedded documents
- Time for action — embedding reviews and votes
- Using MongoDB document relationships
- Time for action — creating document relations
- Comparing MongoDB versus SQL syntax
- Using Map/Reduce instead of join
- Time for action — writing the map function for calculating vote statistics
- Time for action — writing the reduce function to process emitted information
- Understanding the Ruby perspective
- Time for action — creating the project
- Time for action — start your engines
- Time for action — configuring Mongoid
- Time for action — planning the object schema
- Time for action — putting it all together
- Time for action — adding reviews to books
- Time for action — embedding Lease and Purchase models
- Time for action — writing the map function to calculate ratings
- Time for action — writing the reduce function to process the emitted results
- Time for action — working with Map/Reduce using Ruby
- Summary
- 3. MongoDB Internals
- Understanding Binary JSON
- What is ObjectId?
- Documents and collections
- JavaScript and MongoDB
- Time for action — writing our own custom functions in MongoDB
- Ensuring write consistency or "read your writes"
- Global write lock
- Transactional support in MongoDB
- Time for action — implementing optimistic locking
- Why are there no joins in MongoDB?
- Summary
- 4. Working Out Your Way with Queries
- Searching by fields in a document
- Time for action — searching by a string value
- Time for action — fetching only for specific fields
- Time for action — skipping documents and limiting our search results
- Time for action — finding books by name or publisher
- Time for action — finding the highly ranked books
- Searching inside arrays
- Time for action — searching inside reviews
- Searching inside hashes
- Searching inside embedded documents
- Searching with regular expressions
- Time for action — using regular expression searches
- Summary
- 5. Ruby DataMappers: Ruby and MongoDB Go Hand in Hand
- Why do we need Ruby DataMappers
- Time for action — using mongo gem
- The Ruby DataMappers for MongoDB
- Setting up DataMappers
- Time for action — configuring MongoMapper
- Time for action — setting up Mongoid
- Creating, updating, and destroying documents
- Time for action — creating and updating objects
- Using finder methods
- Using MongoDB criteria
- Time for action — fetching using the where criterion
- Understanding model relationships
- Time for action — relating models
- Time for action — categorizing books
- Time for action — adding book details
- Time for action — managing the driver entities
- Time for action — creating vehicles using basic polymorphism
- Using embedded objects
- Time for action — creating embedded objects
- Reverse embedded relations in Mongoid
- Time for action — using embeds_one without specifying embedded_in
- Time for action — using embeds_many without specifying embedded_in
- Understanding embedded polymorphism
- Time for action — adding licenses to drivers
- Time for action — insuring drivers
- Choosing whether to embed or to associate documents
- Mongoid or MongoMapper — the verdict
- Summary
- 6. Modeling Ruby with Mongoid
- Developing a web application with Mongoid
- Time for action — setting up a Rails project
- Time for action — using Sinatra professionally
- Defining attributes in models
- Time for action — adding dynamic fields
- Time for action — localizing fields
- Using arrays and hashes in models
- Defining relations in models
- Time for action — configuring the many-to-many relation
- Time for action — setting up the following and followers relationship
- Time for action — setting up cyclic relations
- Managing changes in models
- Time for action — changing models
- Mixing in Mongoid modules
- Time for action — getting paranoid
- Time for action — including a version
- Summary
- 7. Achieving High Performance on Your Ruby Application with MongoDB
- Profiling MongoDB
- Time for action — enabling profiling for MongoDB
- Using the explain function
- Time for action — explaining a query
- Using covered indexes
- Time for action — using covered indexes
- Other MongoDB performance tuning techniques
- Understanding web application performance
- Optimizing our code for performance
- Optimizing and tuning the web application stack
- Summary
- 8. Rack, Sinatra, Rails, and MongoDB — Making Use of them All
- Revisiting Sodibee
- The Rails way
- Time for action — modeling the Author class
- Time for action — writing the Book, Category and Address models
- Time for action — modeling the Order class
- Time for action — configuring routes
- Time for action — writing the AuthorsController
- Time for action — designing the layout
- Time for action — listing authors
- Time for action — adding new authors and books
- The Sinatra way
- Time for action — setting up Sinatra and Rack
- Testing and automation using RSpec
- Time for action — installing RSpec
- Time for action — sporking it
- Documenting code using YARD
- Summary
- 9. Going Everywhere — Geospatial Indexing with MongoDB
- What is geolocation
- Identifying the exact geolocation
- Storing coordinates in MongoDB
- Time for action — geocoding the Address model
- Time for action — saving geolocation coordinates
- Time for action — using geocoder for storing coordinates
- Firing geolocation queries
- Time for action — finding nearby addresses
- Time for action — firing near queries in Mongoid
- Summary
- 10. Scaling MongoDB
- High availability and failover via replication
- Time for action — setting up the master/slave replication
- Time for action — implementing replica sets
- Implementing replica sets for Sodibee
- Time for action — configuring replica sets for Sodibee
- Implementing sharding
- Time for action — setting up the shards
- Time for action — starting the config server
- Time for action — setting up mongos
- Implementing Map/Reduce
- Time for action — planning the Map/Reduce functionality
- Time for action — Map/Reduce via the mongo console
- Time for action — Map/Reduce via Ruby
- Time for action — iterating Ruby objects
- Summary
- A. Pop quiz — Answers
- Chapter 2: Diving Deep into MongoDB
- Chapter 3: MongoDB Internals
- Chapter 4: Working out your Way with Queries
- Chapter 5: Ruby DataMappers: Ruby and MongoDB Go Hand in Hand
- Chapter 6: Modeling Ruby with Mongoid
- Chapter 8: Rack, Sinatra, Rails and MongoDB - Making use of them all
- Chapter 10: Scaling MongoDB
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