Added test to make sure no unnecessary connections are made to S3.

Changed S3 URL generation to a manual interpolation instead of RightAws's public_link method.

lib/paperclip/storage.rb

@@ -53,7 +53,7 @@ module Paperclip
           @url                = ":s3_url"
         end
         base.class.interpolations[:s3_url] = lambda do |attachment, style|
-          attachment.to_io(style).public_link
+          "https://s3.amazonaws.com/#{attachment.bucket_name}#{attachment.path(style)}"
         end
       end
 
@@ -67,6 +67,10 @@ module Paperclip
         @s3_bucket ||= s3.bucket(@bucket, true, @s3_permissions)
       end
 
+      def bucket_name
+        @bucket
+      end
+
       def parse_credentials creds
         creds = find_credentials(creds).stringify_keys
         (creds[ENV['RAILS_ENV']] || creds).symbolize_keys

test/test_storage.rb

@@ -46,6 +46,7 @@ class StorageTest < Test::Unit::TestCase
     setup do
       rebuild_model :storage => :s3,
                     :bucket => "testing",
+                    :path => "/:attachment/:style/:basename.:extension",
                     :s3_credentials => {
                       'access_key_id' => "12345",
                       'secret_access_key' => "54321"
@@ -67,6 +68,12 @@ class StorageTest < Test::Unit::TestCase
         @dummy.avatar = @file
       end
 
+      should "not get a bucket to get a URL" do
+        @dummy.avatar.expects(:s3).never
+        @dummy.avatar.expects(:s3_bucket).never
+        assert_equal "https://s3.amazonaws.com/testing/avatars/original/5k.png", @dummy.avatar.url
+      end
+
       context "and saved" do
         setup do
           @s3_mock     = stub