bring back in the Rails 3.0 railtie, and use it if we should

Author: indirect

lib/jquery-rails.rb

@@ -1,10 +1,10 @@
 module Jquery
   module Rails
 
-    class Engine < ::Rails::Engine
-      config.before_configuration do
-        require "jquery-rails/assert_select_jquery" if ::Rails.env.test?
-      end
+    if ::Rails.version < "3.1"
+      require 'jquery-rails/railtie'
+    else
+      require 'jquery-rails/engine'
     end
 
   end

lib/jquery-rails/railtie.rb

@@ -0,0 +1,21 @@
+# Configure Rails 3.0 to use public/javascripts/jquery et al
+module Jquery
+  module Rails
+
+    class Railtie < ::Rails::Railtie
+      config.before_configuration do
+        require "jquery-rails/assert_select_jquery" if ::Rails.env.test?
+
+        if ::Rails.root.join("public/javascripts/jquery-ui.min.js").exist?
+          jq_defaults = %w(jquery jquery-ui)
+          jq_defaults.map!{|a| a + ".min" } if ::Rails.env.production?
+        else
+          jq_defaults = ::Rails.env.production? ? %w(jquery.min) : %w(jquery)
+        end
+
+        config.action_view.javascript_expansions[:defaults] = jq_defaults + %w(rails)
+      end
+    end
+
+  end
+end