Module: NoBacksies

Defined in:

lib/no_backsies.rb

Overview

NoBacksies module ecapsulates all supported callback mixins.

NoBackseis::Callbacks can be mixed-in and all supported callbacks will be applied to the class or module.

class Y
  include NoBacksies::Callbacks

  def self.list
    @list ||= []
  end

  callback :method_added do |method|
    list << method
  end

  def foo; end
  def bar; end
end

Y.list.assert #=> [:foo, :bar]

Using callbacks can easily lead to infinite loops. NoBacksies makes it easier to control callback expression via the #callback_express method.

class Z
  include NoBacksies::Callbacks

  def self.list
    @list ||= []
  end

  callback :method_added do |method|
    callback_express :method_added=>false do
      define_method("#{method}!") do
        send(method) + "!"
      end
    end
  end

  def foo; "foo"; end
  def bar; "bar"; end
end

y = Y.new
y.foo! #=> "foo!"

NOTE: Currently the NoBackies module only supports class level callbacks. We will look into adding instance level callbacks in a future version.

– TODO: What about adding ‘super if defined?(super)` to callback methods? Should this be standard? Should it occur before or after? Or should in be controlled via a special callback, e.g. `callback method_added, :super`? ++

Defined Under Namespace

Modules: CallbackMethods, Callbacks, ConstMissing, Extended, Included, Inherited, MethodAdded, MethodRemoved, MethodUndefined, SingletonMethodAdded, SingletonMethodRemoved, SingletonMethodUndefined