Module: Mixiner

Defined in:
lib/mixiner.rb

Overview

Make easy to create mixin modules to group together related methods.

As those methods are not defined directly on the class those can be redefined afterwards.

Examples:

class Settings
  # make the mixin method available
  include Mixiner

  def initialize
    @properties = {}
  end

  def property name, type
    # define the methods in the mixin
    mixin('Properties').define_method name do
      @properties[name]
    end

    mixin('Properties').define_method "#{ name }=" do |value|
      @properties[name] = value if value.kind_of? type
    end
  end

  property limit, Integer
  property name,  String

  # overwrite the name writter with custom logic
  def name= value
    super value.capitalize
  end

end

Instance Method Summary collapse

Instance Method Details

#mixin(subject) ⇒ Object

Initialize or retrieve a mixin module for the given subject

Create a mixin module to group a set of related methods making sure that ‘define_method` is public so it is easier to add methods there.

The module is defined just once and is included in the base class to make those methods accessible.



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# File 'lib/mixiner.rb', line 44

def mixin subject
  if self.const_defined? subject, false
    self.const_get subject
  else
    mod = Module.new do
      public_class_method :define_method
    end
    self.const_set subject, mod
    self.include mod
    mod
  end
end