This class has dubious semantics and we only have it so that people can write params[:key] instead of params['key'] and they get the same value for both keys.

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lazy_load_hooks allows rails to lazily load a lot of components and thus making the app boot faster. Because of this feature now there is no need to require ActiveRecord::Base at boot time purely to apply configuration. Instead a hook is registered that applies configuration once ActiveRecord::Base is loaded. Here ActiveRecord::Base is used as example but this feature can be applied elsewhere too.

Here is an example where on_load method is called to register a hook.

  initializer "active_record.initialize_timezone" do
    ActiveSupport.on_load(:active_record) do
      self.time_zone_aware_attributes = true
      self.default_timezone = :utc
    end
  end

When the entirety of activerecord/lib/active_record/base.rb has been evaluated then run_load_hooks is invoked. The very last line of activerecord/lib/active_record/base.rb is:

  ActiveSupport.run_load_hooks(:active_record, ActiveRecord::Base)

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encoding: utf-8

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encoding: utf-8

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encoding: utf-8

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Usually key value pairs are handled something like this:

  h = {}
  h[:boy] = 'John'
  h[:girl] = 'Mary'
  h[:boy]  # => 'John'
  h[:girl] # => 'Mary'

Using OrderedOptions, the above code could be reduced to:

  h = ActiveSupport::OrderedOptions.new
  h.boy = 'John'
  h.girl = 'Mary'
  h.boy  # => 'John'
  h.girl # => 'Mary'

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Some code from jeremymcanally’s “pending” github.com/jeremymcanally/pending/tree/master

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The TimeZone class serves as a wrapper around TZInfo::Timezone instances. It allows us to do the following:

• Limit the set of zones provided by TZInfo to a meaningful subset of 142 zones.

• Retrieve and display zones with a friendlier name (e.g., “Eastern Time (US & Canada)” instead of “America/New_York“).

• Lazily load TZInfo::Timezone instances only when they’re needed.

• Create ActiveSupport::TimeWithZone instances via TimeZone’s local, parse, at and now methods.

If you set config.time_zone in the Rails Application, you can access this TimeZone object via Time.zone:

  # application.rb:
  class Application < Rails::Application
    config.time_zone = "Eastern Time (US & Canada)"
  end

  Time.zone       # => #<TimeZone:0x514834...>
  Time.zone.name  # => "Eastern Time (US & Canada)"
  Time.zone.now   # => Sun, 18 May 2008 14:30:44 EDT -04:00

The version of TZInfo bundled with Active Support only includes the definitions necessary to support the zones defined by the TimeZone class. If you need to use zones that aren’t defined by TimeZone, you’ll need to install the TZInfo gem (if a recent version of the gem is installed locally, this will be used instead of the bundled version.)

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XmlMini JRuby JDOM implementation

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XmlMini LibXML implementation

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XmlMini LibXML implementation using a SAX-based parser

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XmlMini Nokogiri implementation

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XmlMini Nokogiri implementation using a SAX-based parser

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XmlMini ReXML implementation