module Molar

Mixin providing method_missing attribute lookup. Defines appropriate getters and setters on the fly so as not to incur method_missing penalty on each access.

Example:

class Jedi

include Molar

def initialize(attributes)
  @attributes = attributes
end

end

jedi = Jedi.new(name: ‘Yoda’, title: ‘Master’) jedi.name # => ‘Yoda’

jedi.name = ‘Luke’ jedi.name # => ‘Luke’

Note: Currently, Molar only performs the lookup in @attributes.

Constants

VERSION

Private Class Methods

included(descendant) click to toggle source

# File lib/molar.rb, line 28
def self.included(descendant)
  descendant.class_eval do
    alias_method :__method_missing, :method_missing

    attr_reader :attributes
    private :attributes

    def method_missing(method, *args, &block)
      __attribute?(method) ? __register_and_call(method, *args, &block) : super
    end
  end
end

Public Instance Methods

method_missing(method, *args, &block) click to toggle source

Calls superclass method

# File lib/molar.rb, line 35
def method_missing(method, *args, &block)
  __attribute?(method) ? __register_and_call(method, *args, &block) : super
end

Private Instance Methods

__add_methods(attribute) click to toggle source

# File lib/molar.rb, line 59
def __add_methods(attribute)
  singleton_class.instance_eval do
    define_method(attribute) { attributes[attribute] }
    define_method("#{attribute}=") { |val| attributes[attribute] = val }
  end
end

__attr_name(attribute) click to toggle source

# File lib/molar.rb, line 67
def __attr_name(attribute)
  str_attr = attribute.to_s

  str_attr.end_with?('=') ? str_attr[0..-2].to_sym : str_attr.to_sym
end

__attribute?(name) click to toggle source

# File lib/molar.rb, line 42
def __attribute?(name)
  attributes.key?(__attr_name(name))
end

__register(method) click to toggle source

# File lib/molar.rb, line 53
def __register(method)
  attr_name = __attr_name(method)
  __add_methods(attr_name)
end

__register_and_call(method, *args, &block) click to toggle source

# File lib/molar.rb, line 47
def __register_and_call(method, *args, &block)
  __register(method)
  send(method, *args, &block)
end