Clarify AMS dependencies

Gemfile

@@ -3,17 +3,18 @@ source 'https://rubygems.org'
 # Specify your gem's dependencies in active_model_serializers.gemspec
 gemspec
 
-gem "minitest"
+version = ENV['RAILS_VERSION'] || '4.2'
 
-version = ENV["RAILS_VERSION"] || "4.2"
-
-if version == "master"
-  gem "rails", github: "rails/rails"
+if version == 'master'
+  gem 'rails', github: 'rails/rails'
 
   # ugh https://github.com/rails/rails/issues/16063#issuecomment-48090125
-  gem "arel", github: "rails/arel"
+  gem 'arel', github: 'rails/arel'
 else
-  gem "rails", "~> #{version}.0"
+  gem_version = "~> #{version}.0"
+  gem 'activemodel', gem_version
+  gem 'actionpack', gem_version
+  gem 'railties', gem_version
 end
 
 # Windows does not include zoneinfo files, so bundle the tzinfo-data gem

active_model_serializers.gemspec

@@ -4,26 +4,47 @@ $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 require 'active_model/serializer/version'
 
 Gem::Specification.new do |spec|
-  spec.name          = "active_model_serializers"
+  spec.name          = 'active_model_serializers'
   spec.version       = ActiveModel::Serializer::VERSION
-  spec.authors       = ["Steve Klabnik"]
-  spec.email         = ["[email protected]"]
+  spec.platform      = Gem::Platform::RUBY
+  spec.authors       = ['Steve Klabnik']
+  spec.email         = ['[email protected]']
   spec.summary       = %q{Conventions-based JSON generation for Rails.}
   spec.description   = %q{ActiveModel::Serializers allows you to generate your JSON in an object-oriented and convention-driven manner.}
-  spec.homepage      = "https://github.com/rails-api/active_model_serializers"
-  spec.license       = "MIT"
+  spec.homepage      = 'https://github.com/rails-api/active_model_serializers'
+  spec.license       = 'MIT'
 
   spec.files         = `git ls-files -z`.split("\x0")
-  spec.executables   = spec.files.grep(%r{^bin/}) { |f| File.basename(f) }
   spec.test_files    = spec.files.grep(%r{^(test|spec|features)/})
-  spec.require_paths = ["lib"]
+  spec.require_paths = ['lib']
 
-  spec.add_dependency "activemodel", ">= 4.0"
+  spec.required_ruby_version = '>= 1.9.3'
 
-  spec.add_development_dependency "rails", ">= 4.0"
-  spec.add_development_dependency "bundler", "~> 1.6"
-  spec.add_development_dependency "timecop", ">= 0.7"
-  spec.add_development_dependency "rake"
-  spec.add_development_dependency "kaminari"
-  spec.add_development_dependency "will_paginate"
+  rails_versions = '>= 4.0'
+  spec.add_runtime_dependency 'activemodel', rails_versions
+    # 'activesupport', rails_versions
+    # 'builder'
+
+  spec.add_runtime_dependency 'actionpack', rails_versions
+    # 'activesupport', rails_versions
+    # 'rack'
+    # 'rack-test', '~> 0.6.2'
+
+  spec.add_runtime_dependency 'railties', rails_versions
+    # 'activesupport', rails_versions
+    # 'actionpack', rails_versions
+    # 'rake', '>= 0.8.7'
+
+  # 'activesupport', rails_versions
+    # 'i18n,
+    # 'tzinfo'
+    # 'minitest'
+    # 'thread_safe'
+
+  # Soft dependency for pagination
+  spec.add_development_dependency 'kaminari'
+  spec.add_development_dependency 'will_paginate'
+
+  spec.add_development_dependency 'bundler', '~> 1.6'
+  spec.add_development_dependency 'timecop', '>= 0.7'
 end

lib/active_model_serializers.rb

@@ -10,22 +10,20 @@ def silence_warnings
   end
 
 end
+
 require 'active_model'
-require 'active_model/serializer/version'
+require 'action_controller'
+
 require 'active_model/serializer'
 require 'active_model/serializable_resource'
+require 'active_model/serializer/version'
 
-begin
-  require 'active_model/serializer/railtie'
-  require 'action_controller'
-  require 'action_controller/serialization'
-
-  ActiveSupport.on_load(:action_controller) do
-    include ::ActionController::Serialization
-    ActionDispatch::Reloader.to_prepare do
-      ActiveModel::Serializer.serializers_cache.clear
-    end
+require 'action_controller/serialization'
+ActiveSupport.on_load(:action_controller) do
+  include ::ActionController::Serialization
+  ActionDispatch::Reloader.to_prepare do
+    ActiveModel::Serializer.serializers_cache.clear
   end
-rescue LoadError
-  # rails not installed, continuing
 end
+
+require 'active_model/serializer/railtie'