Class: Module

Inherits:
Object
  • Object
show all
Defined in:
lib/nxt/patches/module.rb

Overview

Some patches that extend the default Ruby Module with some useful methods.

Instance Method Summary collapse

Instance Method Details

#attr_combined_accessor(sym, default = nil) ⇒ Object

Creates an invariant accessor that allows getting and setting from the same endpoint. It will operate in getter mode if you don’t pass any arguments when calling it, otherwise it will work in setter mode. Useful when needing to chain methods (you can’t chain standard attr_writer methods because of the ‘= something` part).



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# File 'lib/nxt/patches/module.rb', line 10

def attr_combined_accessor(sym, default = nil)
  define_method(sym) do |*args|
    if args.empty?
      instance_var = :"@#{sym}"
      if (value = instance_variable_get(instance_var))
        value
      else
        instance_variable_set(instance_var, default)
        default
      end
    else
      send(:"#{sym}=", *args)
    end
  end
end