Class: Module

Inherits:
Object show all
Defined in:
lib/active_support/dependencies.rb,
lib/active_support/module_attribute_accessors.rb

Overview

Extends the module object with module and instance accessors for class attributes, just like the native attr* accessors for instance attributes.

Direct Known Subclasses

Dependencies::LoadingModule

Instance Method Summary collapse

Instance Method Details

#const_missing(class_id) ⇒ Object

Use const_missing to autoload associations so we don't have to require_association when using single-table inheritance.


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# File 'lib/active_support/dependencies.rb', line 177

def const_missing(class_id)
  if Object.const_defined?(:Controllers) and Object::Controllers.const_available?(class_id)
    return Object::Controllers.const_get(class_id)
  end
  
  begin
    require_dependency(class_id.to_s.demodulize.underscore)
    if Object.const_defined?(class_id) then return Object.const_get(class_id) else raise LoadError end
  rescue LoadError => e
    raise NameError.new("uninitialized constant #{class_id}").copy_blame!(e)
  end
end

#mattr_accessor(*syms) ⇒ Object


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# File 'lib/active_support/module_attribute_accessors.rb', line 53

def mattr_accessor(*syms)
  mattr_reader(*syms)
  mattr_writer(*syms)
end

#mattr_reader(*syms) ⇒ Object


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# File 'lib/active_support/module_attribute_accessors.rb', line 4

def mattr_reader(*syms)
  syms.each do |sym|
    class_eval <<-EOS
      if ! defined? @@#{sym.id2name}
        @@#{sym.id2name} = nil
      end
      
      def self.#{sym.id2name}
        @@#{sym}
      end

      def #{sym.id2name}
        @@#{sym}
      end

      def call_#{sym.id2name}
        case @@#{sym.id2name}
          when Symbol then send(@@#{sym})
          when Proc   then @@#{sym}.call(self)
          when String then @@#{sym}
          else nil
        end
      end
    EOS
  end
end

#mattr_writer(*syms) ⇒ Object


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# File 'lib/active_support/module_attribute_accessors.rb', line 31

def mattr_writer(*syms)
  syms.each do |sym|
    class_eval <<-EOS
      if ! defined? @@#{sym.id2name}
        @@#{sym.id2name} = nil
      end
      
      def self.#{sym.id2name}=(obj)
        @@#{sym.id2name} = obj
      end

      def self.set_#{sym.id2name}(obj)
        @@#{sym.id2name} = obj
      end

      def #{sym.id2name}=(obj)
        @@#{sym} = obj
      end
    EOS
  end
end