B10 Class in Java

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B10 Class
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>> objectsetting = "bar" => "bar" >> klasssetting => "foo"
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Active Support
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To opt out of the instance writer method, pass :instance_writer => false
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klass = Classnew { class_attribute :setting, :instance_writer => false } >> klassnewsetting => NoMethodError
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The class_attribute method also works with singleton classes, as can be seen in the following example
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klass = Classnew { class_attribute :setting } >> klasssingleton_classsetting = "foo" => "foo"
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For convenience, a query method is defined as well, which allows you to see if an attribute has been set on a particular class instance
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klass = Classnew { class_attribute :setting } >> klasssetting => false >> klasssetting = "foo" => "foo" >> klasssetting => true
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B102 active support/core ext/class/
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attribute accessors
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This extends the class object with class and instance accessors for class attributes, just like the native attr* accessors for instance attributes
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cattr accessor(*syms)
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Creates both reader and writer methods for supplied method names syms
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class Person cattr_accessor :hair_colors end
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Appendix B: Active Support API Reference
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>> Personhair_colors = [:brown, :black, :blonde, :red] >> Personnewhair_colors => [:brown, :black, :blonde, :red]
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cattr reader(*syms)
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Creates class and instance reader methods for supplied method names syms
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cattr writer(*syms)
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Creates class and instance writer methods for supplied method names syms
B103 active support/core ext/class/
attribute accessors
This extends the class object with class and instance accessors for class attributes, just like the native attr* accessors for instance attributes
B104 active support/core ext/class/
delegating attributes
This is primarily for internal use by Rails
superclass delegating accessors(name, options = {})
Generates class methods name, name=, and name These methods dispatch to the private _name, and _name= methods, making them overridable by subclasses If an instances should be able to access the attribute then pass :instance_reader => true in the options to generate a name method accessible to instances
B105 active support/core ext/class/
inheritable attributes
This allows attributes to be shared within an inheritance hierarchy, but where each descendant gets a copy of their parents attributes, instead of just a pointer to the same This means that the child can add elements to, for example, an array without those additions being shared with either their parent, siblings, or children, unlike the regular class-level attributes that are shared across the entire hierarchy The copies of inheritable parent attributes are added to subclasses when they are created, via the inherited hook All reader methods accept :instance_reader => true
B10 Class
option All writer methods accept :instance_writer => true option Accessor methods accept both options Like many other obscure corners of Active Support, these methods are primarily for internal use by Rails itself and some of them are no longer used internally by Rails 3 They are included here primarily for completeness and on the off chance that they could be useful in advanced application code or in libraries that depend on Active Support
Active Support
class inheritable accessor(*syms)
Creates class inheritable attribute accessor(s)
class FormBuilder class_inheritable_accessor :field_helpers
class inheritable array(*syms)
Creates class inheritable attribute(s) initialized to an empty array
class inheritable hash(*syms)
Creates class inheritable attribute(s) initialized to an empty hash
inheritable attributes
Returns array of any class inheritable attributes that have been defined on a particular class instance
>> ActiveRecord::Baseinheritable_attributes => {:nested_attributes_options=>{}, :default_scoping=>[], :skip_time_zone_conversion_for_attributes=>[], :record_timestamps=>true, :attribute_method_matchers=>}
reset inheritable attributes
Clears class inheritable attributes that have been defined on a particular class instance
B106 active support/core ext/class/
subclasses
Provides methods that introspect the inheritance hierarchy of a class Used extensively in Active Record
subclasses
Returns an array with the names of the subclasses of self as strings
Integersubclasses # => ["Bignum", "Fixnum"]
Appendix B: Active Support API Reference
descendents
Returns an array of all class objects found that are subclasses of self
B11 ActiveSupport::Concern B111 active support/concern
The Concern module is only 29 lines of Ruby code, but it helps drive some of the most elegant code improvements in Rails 3 Using it, you can make your code more modular and have less dependency problems than ever before You use Concern to define common behavior that you want to mix into other application classes, or into Rails itself in the case of plugins A Concern module has three elements: the included block, ClassMethods module, and InstanceMethods module
require 'active_support/concern' module Foo extend ActiveSupport::Concern included do selfsend(:do_something_in_mixin_class) end module ClassMethods def bar end end module InstanceMethods def baz end end end
To use your custom Concern module, just mix it into a class
class Widget include Foo end
The included block will be triggered at inclusion time Methods in ClassMethods will get added to Widget as class methods Methods in InstanceMethods will get added to Widget as instance methods
B13 Date
See ActiveSupport::Configurable for a good example of how Concern is used internally by Rails
Active Support
B12 ActiveSupport::Configurable
This Configurable module is used internally by Rails to add configuration settings to AbstractController::Base You can use it yourself to add configuration to your classes