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    Copyright
    Praise for the Previous Edition
    Foreword by David Heinemeier Hansson
    Foreword by Yehuda Katz
    Introduction
    Acknowledgments
    About the Author
    Ch. 1. Rails Environments and Configuration
    Ch. 2. Routing
    Ch. 3. REST, Resources, and Rails
    Ch. 4. Working with Controllers
    Ch. 5. Working with Active Record
    Ch. 6. Active Record Migrations
    Ch. 7. Active Record Associations
    Ch. 8. Validations
    Ch. 9. Advanced Active Record
    Ch. 10. Action View
    Ch. 11. All About Helpers
    Ch. 12. Ajax on Rails
    Ch. 13. Session Management
    Ch. 14. Authentication
    Ch. 15. XML and Active Resource
    Ch. 16. Action Mailer
    Ch. 17. Caching and Performance
    Ch. 18. RSpec
    Ch. 19. Extending Rails with Plugins
    Ch. 20. Background Processing
    Appx. A. Active Model API Reference
    Appx. B. Active Support API Reference
    Array
    ActiveSupport::BacktraceCleaner
    ActiveSupport::Base64
    ActiveSupport::BasicObject
    ActiveSupport::Benchmarkable
    BigDecimal
    ActiveSupport::BufferedLogger
    ActiveSupport::Cache::Store
    ActiveSupport::Callbacks
    Class
    ActiveSupport::Concern
    ActiveSupport::Configurable
    Date
    DateTime
    ActiveSupport::Dependencies
    ActiveSupport::Deprecation
    ActiveSupport::Duration
    Enumerable
    ERB::Util
    FalseClass
    File
    Float
    Hash
    HashWithIndifferentAccess
    ActiveSupport::Inflector::Inflections
    Integer
    ActiveSupport::JSON
    Kernel
    Logger
    ActiveSupport::MessageEncryptor
    ActiveSupport::MessageVerifier
    Module
    ActiveSupport::Multibyte::Chars
    NilClass
    ActiveSupport::Notifications
    Numeric
    Object
    ActiveSupport::OrderedHash
    ActiveSupport::OrderedOptions
    ActiveSupport::Railtie
    Range
    Regexp
    ActiveSupport::Rescuable
    ActiveSupport::SecureRandom
    String
    ActiveSupport::StringInquirer
    Symbol
    ActiveSupport::Testing::Assertions
    Time
    ActiveSupport::TimeWithZone
    ActiveSupport::TimeZone
    ActiveSupport::TrueClass
    ActiveSupport::XmlMini
    Index
    Method Index
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    Section B.36. Numeric

    B.36. Numeric

    Extensions to Ruby’s Numeric class.

    B.36.1. active_support/core_ext/object/blank

    blank?

    Returns false.


      

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