Module Lazy
In: lib/grit/lazy.rb

Allows attributes to be declared as lazy, meaning that they won‘t be computed until they are asked for.

Works by delegating each lazy_reader to a cached lazy_source method.

class Person

  lazy_reader :eyes

  def lazy_source
    OpenStruct.new(:eyes => 2)
  end

end

>> Person.new.eyes

> 2

Methods

Public Instance methods

[Source]

# File lib/grit/lazy.rb, line 19
  def lazy_reader(*args)
    args.each do |arg|
      ivar = "@#{arg}"
      define_method(arg) do
        if instance_variable_defined?(ivar)
          val = instance_variable_get(ivar)
          return val if val
        end
        instance_variable_set(ivar, (@lazy_source ||= lazy_source).send(arg))
      end
    end
  end

[Validate]