Class: Class

Inherits:
Object show all
Defined in:
lib/core_utilities/core_ext/class.rb

Instance Method Summary collapse

Instance Method Details

#class_attribute_with_default(*attrs) ⇒ Object

Purpose is to be able to define a default value for a class_attribute when one isn’t initially set.



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# File 'lib/core_utilities/core_ext/class.rb', line 6

def class_attribute_with_default(*attrs) # Actually, this IS being used currently by gems in lib/
  hash = attrs.last.is_a?(Hash) ? attrs.pop : {}
  my_default = hash.delete(:default)
  instance_writer = hash.blank? || hash[:instance_writer]

  attrs.each do |name| # By the way, FIXME: i think this should be broken because if i want to use a string as a default, that will not be reflected.
    class_eval <<-RUBY, __FILE__, __LINE__ + 1
      def self.#{name}() #{my_default || 'nil'} end
      def self.#{name}?() !!#{name} end

      def self.#{name}=(val)
        singleton_class.class_eval do
          remove_possible_method(:#{name})
          define_method(:#{name}) { val }
        end
        val
      end

      def #{name}
        defined?(@#{name}) ? @#{name} : singleton_class.#{name}
      end

      def #{name}?
        !!#{name}
      end
    RUBY

    attr_writer name if instance_writer
  end
end