Initial commit. Add all of DecoratesBeforeRendering.

.gitignore

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+*.gem
+*.rbc
+.bundle
+.config
+.yardoc
+Gemfile.lock
+InstalledFiles
+_yardoc
+coverage
+doc/
+lib/bundler/man
+pkg
+rdoc
+spec/reports
+test/tmp
+test/version_tmp
+tmp
+.rspec

Gemfile

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+source 'https://rubygems.org'
+
+# Specify your gem's dependencies in decorates_before_rendering.gemspec
+gemspec

LICENSE

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+Copyright (c) 2012 Rob Hanlon
+
+MIT License
+
+Permission is hereby granted, free of charge, to any person obtaining
+a copy of this software and associated documentation files (the
+"Software"), to deal in the Software without restriction, including
+without limitation the rights to use, copy, modify, merge, publish,
+distribute, sublicense, and/or sell copies of the Software, and to
+permit persons to whom the Software is furnished to do so, subject to
+the following conditions:
+
+The above copyright notice and this permission notice shall be
+included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

README.md

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+# DecoratesBeforeRendering
+
+A small add-on for [Draper](http://github.com/jcasimir/draper) that automatically decorates
+specified controller instance variables before rendering. Currently only works on objects
+that respond to ```model_name````, but this could easily be expanded upon.
+
+## Installation
+
+Add this line to your application's Gemfile:
+
+    gem 'decorates_before_rendering'
+
+And then execute:
+
+    $ bundle
+
+Or install it yourself as:
+
+    $ gem install decorates_before_rendering
+
+## Usage
+
+See ```lib/decorates_before_rendering.rb``` for usage instructions.
+
+## Contributing
+
+1. Fork it
+2. Create your feature branch (`git checkout -b my-new-feature`)
+3. Commit your changes (`git commit -am 'Add some feature'`)
+4. Push to the branch (`git push origin my-new-feature`)
+5. Create new Pull Request

Rakefile

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+#!/usr/bin/env rake
+require "bundler/gem_tasks"

decorates_before_rendering.gemspec

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+# -*- encoding: utf-8 -*-
+require File.expand_path('../lib/decorates_before_rendering/version', __FILE__)
+
+Gem::Specification.new do |gem|
+  gem.authors       = ["Rob Hanlon"]
+  gem.email         = ["rob@mediapiston.com"]
+  gem.description   = %q{Small add-on for Draper that decorates models before rendering.}
+  gem.summary       = %q{Small add-on for Draper that decorates models before rendering.}
+  gem.homepage      = "http://github.com/ohwillie/decorates_before_rendering"
+
+  gem.files         = `git ls-files`.split($\)
+  gem.executables   = gem.files.grep(%r{^bin/}).map{ |f| File.basename(f) }
+  gem.test_files    = gem.files.grep(%r{^(test|spec|features)/})
+  gem.name          = "decorates_before_rendering"
+  gem.require_paths = ["lib"]
+  gem.version       = DecoratesBeforeRendering::VERSION
+
+  gem.add_development_dependency 'rspec', '>= 2.10.0'
+  gem.add_development_dependency 'rbx-require-relative', '>= 0.0.9'
+
+  gem.add_dependency 'activesupport', '>= 3.2.6'
+end

lib/decorates_before_rendering.rb

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+# -*- encoding : utf-8 -*-
+require "decorates_before_rendering/version"
+require 'active_support/core_ext/string/inflections'
+require 'active_support/core_ext/class/attribute'
+
+# Decorates the specified fields. For instance, if you have
+#
+#   class StuffController < ApplicationController
+#     include DecoratesBeforeRendering
+#
+#     decorates :thing_1, :thing_2
+#   end
+#
+# @thing_1 and @thing_2 will be decorated right before a rendering occurs.
+#
+module DecoratesBeforeRendering
+  module ClassMethods
+    def decorates(*unsigiled_ivar_names)
+      self.__ivars_to_decorate__ = unsigiled_ivar_names.map { |i| "@#{i}" }
+    end
+  end
+
+  def render(*args)
+    __decorate_ivars__
+    super(*args)
+  end
+
+private
+
+  def __decorate_ivars__
+    ivars_to_decorate = self.class.__ivars_to_decorate__
+
+    return if ivars_to_decorate.nil?
+
+    ivars_to_decorate.each do |ivar_name|
+      ivar = instance_variable_get(ivar_name)
+      instance_variable_set(ivar_name, __decorator_for__(ivar)) unless ivar.nil?
+    end
+  end
+
+  def __decorator_for__(ivar)
+    __decorator_name_for__(ivar).constantize.decorate(ivar)
+  end
+
+  def __decorator_name_for__(ivar)
+    "#{__model_name_for__(ivar)}Decorator"
+  end
+
+  def __model_name_for__(ivar)
+    if ivar.respond_to?(:model_name)
+      ivar
+    elsif ivar.class.respond_to?(:model_name)
+      ivar.class
+    else
+      raise ArgumentError, "#{ivar} does not have an associated model"
+    end.model_name
+  end
+
+  def self.included(base)
+    base.class_attribute :__ivars_to_decorate__, :instance_accessor => false
+    base.extend ClassMethods
+  end
+end

lib/decorates_before_rendering/version.rb

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+module DecoratesBeforeRendering
+  VERSION = "0.0.1"
+end

spec/decorates_before_rendering_spec.rb

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+require_relative '../lib/decorates_before_rendering'
+
+class MyCompletelyFakeModelDecorator; end
+
+describe DecoratesBeforeRendering do
+  # NOTE: these are married together, so they're tested together.
+  describe '::decorates + #render' do
+    let(:sentinel) { double(:sentinel) }
+    let(:ivar) { double('@ivar') }
+
+    # NOTE: This superclass is here so we know that the correct render gets
+    #       called. It can't be defined in the subclass, or else that one
+    #       will be the one that's used, as modules sit above their includers
+    #       in the class hierarchy.
+    let(:superclass) do
+      Class.new do
+        def initialize(sentinel)
+          @sentinel = sentinel
+        end
+
+        def render(*args)
+          @sentinel.render(*args)
+        end
+      end
+    end
+    let(:klass) do
+      Class.new(superclass) do
+        include DecoratesBeforeRendering
+
+        attr_reader :ivar
+
+        def initialize(sentinel, ivar)
+          super(sentinel)
+
+          @ivar = ivar
+        end
+      end
+    end
+    let(:instance) { klass.new(sentinel, ivar) }
+    let(:args) { double('*args') }
+
+    context "no ivars" do
+      it 'should render' do
+        sentinel.should_receive(:render).with(args)
+        instance.render(args)
+      end
+    end
+
+    context "ivar is not present" do
+      it 'should render' do
+        sentinel.should_receive(:render).with(args)
+        instance.render(args)
+      end
+    end
+
+    context "cannot find model name for ivar" do
+      it 'should raise an ArgumentError' do
+        klass.decorates(:ivar)
+        expect {
+          instance.render(args)
+        }.to raise_error(ArgumentError)
+      end
+    end
+
+    context "ivar responds to model name" do
+      it "should decorate and render" do
+        sentinel.should_receive(:render).with(args)
+        MyCompletelyFakeModelDecorator.should_receive(:decorate).with(ivar)
+        ivar.stub(:model_name => 'MyCompletelyFakeModel')
+        klass.decorates(:ivar)
+        instance.render(args)
+      end
+    end
+
+    context "ivar's class responds to model name" do
+      it "should decorate and render" do
+        sentinel.should_receive(:render).with(args)
+        MyCompletelyFakeModelDecorator.should_receive(:decorate).with(ivar)
+        ivar.stub_chain(:class, :model_name => 'MyCompletelyFakeModel')
+        klass.decorates(:ivar)
+        instance.render(args)
+      end
+    end
+
+    context "subclass inherits attributes" do
+      it "should function correctly" do
+        klass.decorates(:ivar)
+        subclass_instance = Class.new(klass).new(sentinel, ivar)
+        sentinel.should_receive(:render).with(args)
+        MyCompletelyFakeModelDecorator.should_receive(:decorate).with(ivar)
+        ivar.stub_chain(:class, :model_name => 'MyCompletelyFakeModel')
+        subclass_instance.render(args)
+      end
+    end
+  end
+end