Use fewer conditionals & simplify the required files

lib/ransack.rb

@@ -10,7 +10,6 @@ end
 
 module Ransack
   extend Configuration
-
   class UntraversableAssociationError < StandardError; end;
 end
 
@@ -18,20 +17,26 @@ Ransack.configure do |config|
   Ransack::Constants::AREL_PREDICATES.each do |name|
     config.add_predicate name, :arel_predicate => name
   end
-
   Ransack::Constants::DERIVED_PREDICATES.each do |args|
     config.add_predicate *args
   end
 end
 
-require 'ransack/translate'
-require 'ransack/adapters/active_record/ransack/translate' if defined?(::ActiveRecord::Base)
-require 'ransack/adapters/mongoid/ransack/translate' if defined?(::Mongoid)
 require 'ransack/search'
 require 'ransack/ransacker'
-require 'ransack/adapters/active_record' if defined?(::ActiveRecord::Base)
-require 'ransack/adapters/mongoid' if defined?(::Mongoid)
 require 'ransack/helpers'
 require 'action_controller'
 
+require 'ransack/translate'
+
+if defined?(::ActiveRecord::Base)
+  require 'ransack/adapters/active_record/ransack/translate'
+  require 'ransack/adapters/active_record'
+end
+
+if defined?(::Mongoid)
+  require 'ransack/adapters/mongoid/ransack/translate'
+  require 'ransack/adapters/mongoid'
+end
+
 ActionController::Base.helper Ransack::Helpers::FormHelper