Removed the need for S3 to connect just to get a URL

lib/paperclip/attachment.rb

@@ -74,7 +74,7 @@ module Paperclip
     # This is not recommended if you don't need the security, however, for
     # performance reasons.
     def url style = default_style
-      exists?(style) ? interpolate(@url, style) : interpolate(@default_url, style)
+      original_filename.nil? ? interpolate(@default_url, style) : interpolate(@url, style)
     end
 
     # Returns the path of the attachment as defined by the :path optionn. If the

lib/paperclip/storage.rb

@@ -50,11 +50,6 @@ module Paperclip
           @s3_credentials     = parse_credentials(@options[:s3_credentials])
           @s3_options         = @options[:s3_options] || {}
           @s3_permissions     = @options[:s3_permissions] || 'public-read'
-
-          @s3                 = RightAws::S3.new(@s3_credentials[:access_key_id],
-                                                 @s3_credentials[:secret_access_key],
-                                                 @s3_options)
-          @s3_bucket          = @s3.bucket(@bucket, true, @s3_permissions)
           @url                = ":s3_url"
         end
         base.class.interpolations[:s3_url] = lambda do |attachment, style|
@@ -62,26 +57,36 @@ module Paperclip
         end
       end
 
+      def s3
+        @s3 ||= RightAws::S3.new(@s3_credentials[:access_key_id],
+                                 @s3_credentials[:secret_access_key],
+                                 @s3_options)
+      end
+
+      def s3_bucket
+        @s3_bucket ||= s3.bucket(@bucket, true, @s3_permissions)
+      end
+
       def parse_credentials creds
         creds = find_credentials(creds).stringify_keys
         (creds[ENV['RAILS_ENV']] || creds).symbolize_keys
       end
       
       def exists?(style = default_style)
-        @s3_bucket.key(path(style)) ? true : false
+        s3_bucket.key(path(style)) ? true : false
       end
 
       # Returns representation of the data of the file assigned to the given
       # style, in the format most representative of the current storage.
       def to_file style = default_style
-        @queued_for_write[style] || @s3_bucket.key(path(style))
+        @queued_for_write[style] || s3_bucket.key(path(style))
       end
       alias_method :to_io, :to_file
 
       def flush_writes #:nodoc:
         @queued_for_write.each do |style, file|
           begin
-            key = @s3_bucket.key(path(style))
+            key = s3_bucket.key(path(style))
             key.data = file
             key.put(nil, @s3_permissions)
           rescue RightAws::AwsError => e
@@ -94,7 +99,7 @@ module Paperclip
       def flush_deletes #:nodoc:
         @queued_for_delete.each do |path|
           begin
-            if file = @s3_bucket.key(path)
+            if file = s3_bucket.key(path)
               file.delete
             end
           rescue RightAws::AwsError

test/test_attachment.rb

@@ -95,9 +95,9 @@ class AttachmentTest < Test::Unit::TestCase
       @instance = stub
       @instance.stubs(:id).returns(41)
       @instance.stubs(:class).returns(Dummy)
-      @instance.stubs(:[]).with(:test_file_name).returns("5k.png")
-      @instance.stubs(:[]).with(:test_content_type).returns("image/png")
-      @instance.stubs(:[]).with(:test_file_size).returns(12345)
+      @instance.stubs(:[]).with(:test_file_name).returns(nil)
+      @instance.stubs(:[]).with(:test_content_type).returns(nil)
+      @instance.stubs(:[]).with(:test_file_size).returns(nil)
       @attachment = Paperclip::Attachment.new(:test,
                                               @instance)
       @file = File.new(File.join(File.dirname(__FILE__),
@@ -111,6 +111,18 @@ class AttachmentTest < Test::Unit::TestCase
       assert_equal "/tests/blah/missing.png", @attachment.url(:blah)
     end
 
+    context "with a file assigned in the database" do
+      setup do
+        @instance.stubs(:[]).with(:test_file_name).returns("5k.png")
+        @instance.stubs(:[]).with(:test_content_type).returns("image/png")
+        @instance.stubs(:[]).with(:test_file_size).returns(12345)
+      end
+
+      should "return a correct url even if the file does not exist" do
+        assert_nil @attachment.to_file
+        assert_equal "/tests/41/blah/5k.png", @attachment.url(:blah)
+      end
+
       context "when expecting three styles" do
         setup do
           styles = {:styles => { :large  => ["400x400", :png],
@@ -148,11 +160,6 @@ class AttachmentTest < Test::Unit::TestCase
               assert_equal "/tests/41/small/5k.jpg", @attachment.url(:small)
             end
 
-          should "return its default_url when no file assigned" do
-            assert @attachment.to_file
-            assert_equal "/tests/blah/missing.png", @attachment.url(:blah)
-          end
-
             should "commit the files to disk" do
               [:large, :medium, :small].each do |style|
                 io = @attachment.to_io(style)
@@ -199,6 +206,8 @@ class AttachmentTest < Test::Unit::TestCase
         end
       end
 
+    end
+
     context "when trying a nonexistant storage type" do
       setup do
         rebuild_model :storage => :not_here

test/test_storage.rb

@@ -5,17 +5,13 @@ require 'right_aws'
 
 require File.join(File.dirname(__FILE__), '..', 'lib', 'paperclip', 'geometry.rb')
 
-class S3Test < Test::Unit::TestCase
+class StorageTest < Test::Unit::TestCase
   context "Parsing S3 credentials" do
     setup do
       rebuild_model :storage => :s3,
                     :bucket => "testing",
                     :s3_credentials => {:not => :important}
 
-      @s3_stub = stub
-      @bucket_stub = stub
-      RightAws::S3.expects(:new).returns(@s3_stub)
-      @s3_stub.expects(:bucket).returns(@bucket_stub)
       @dummy = Dummy.new
       @avatar = @dummy.avatar
 
@@ -54,13 +50,6 @@ class S3Test < Test::Unit::TestCase
                       'access_key_id' => "12345",
                       'secret_access_key' => "54321"
                     }
-
-      @s3_mock     = stub
-      @bucket_mock = stub
-      RightAws::S3.expects(:new).
-        with("12345", "54321", {}).
-        returns(@s3_mock)
-      @s3_mock.expects(:bucket).with("testing", true, "public-read").returns(@bucket_mock)
     end
 
     should "be extended by the S3 module" do
@@ -80,6 +69,10 @@ class S3Test < Test::Unit::TestCase
 
       context "and saved" do
         setup do
+          @s3_mock     = stub
+          @bucket_mock = stub
+          RightAws::S3.expects(:new).with("12345", "54321", {}).returns(@s3_mock)
+          @s3_mock.expects(:bucket).with("testing", true, "public-read").returns(@bucket_mock)
           @key_mock = stub
           @bucket_mock.expects(:key).returns(@key_mock)
           @key_mock.expects(:data=)