:s3_credentials will now accept a Pathname

Rails.root returns a Pathname and you can now declare your attachment
without having to call #to_s first:

has_attached_file :avatar,
                  :storage => :s3,
                  :s3_credentials => Rails.root.join('s3.yml')
(cherry picked from commit 65d7600)

lib/paperclip/storage.rb

@@ -8,18 +8,18 @@ module Storage
     # * +path+: The location of the repository of attachments on disk. This can (and, in
     #   almost all cases, should) be coordinated with the value of the +url+ option to
     #   allow files to be saved into a place where Apache can serve them without
-    #   hitting your app. Defaults to 
+    #   hitting your app. Defaults to
     #   ":rails_root/public/:attachment/:id/:style/:basename.:extension"
-    #   By default this places the files in the app's public directory which can be served 
-    #   directly. If you are using capistrano for deployment, a good idea would be to 
-    #   make a symlink to the capistrano-created system directory from inside your app's 
+    #   By default this places the files in the app's public directory which can be served
+    #   directly. If you are using capistrano for deployment, a good idea would be to
+    #   make a symlink to the capistrano-created system directory from inside your app's
     #   public directory.
     #   See Paperclip::Attachment#interpolate for more information on variable interpolaton.
     #     :path => "/var/app/attachments/:class/:id/:style/:basename.:extension"
     module Filesystem
       def self.extended base
       end
-      
+
       def exists?(style_name = default_style)
         if original_filename
           File.exist?(path(style_name))
@@ -78,25 +78,25 @@ def flush_deletes #:nodoc:
     #   database.yml file, so different environments can use different accounts:
     #     development:
     #       access_key_id: 123...
-    #       secret_access_key: 123... 
+    #       secret_access_key: 123...
     #     test:
     #       access_key_id: abc...
-    #       secret_access_key: abc... 
+    #       secret_access_key: abc...
     #     production:
     #       access_key_id: 456...
-    #       secret_access_key: 456... 
+    #       secret_access_key: 456...
     #   This is not required, however, and the file may simply look like this:
     #     access_key_id: 456...
-    #     secret_access_key: 456... 
+    #     secret_access_key: 456...
     #   In which case, those access keys will be used in all environments. You can also
     #   put your bucket name in this file, instead of adding it to the code directly.
-    #   This is useful when you want the same account but a different bucket for 
+    #   This is useful when you want the same account but a different bucket for
     #   development versus production.
     # * +s3_permissions+: This is a String that should be one of the "canned" access
     #   policies that S3 provides (more information can be found here:
     #   http://docs.amazonwebservices.com/AmazonS3/2006-03-01/RESTAccessPolicy.html#RESTCannedAccessPolicies)
     #   The default for Paperclip is :public_read.
-    # * +s3_protocol+: The protocol for the URLs generated to your S3 assets. Can be either 
+    # * +s3_protocol+: The protocol for the URLs generated to your S3 assets. Can be either
     #   'http' or 'https'. Defaults to 'http' when your :s3_permissions are :public_read (the
     #   default), and 'https' when your :s3_permissions are anything else.
     # * +s3_headers+: A hash of headers such as {'Expires' => 1.year.from_now.httpdate}
@@ -111,7 +111,7 @@ def flush_deletes #:nodoc:
     # * +url+: There are three options for the S3 url. You can choose to have the bucket's name
     #   placed domain-style (bucket.s3.amazonaws.com) or path-style (s3.amazonaws.com/bucket).
     #   Lastly, you can specify a CNAME (which requires the CNAME to be specified as
-    #   :s3_alias_url. You can read more about CNAMEs and S3 at 
+    #   :s3_alias_url. You can read more about CNAMEs and S3 at
     #   http://docs.amazonwebservices.com/AmazonS3/latest/index.html?VirtualHosting.html
     #   Normally, this won't matter in the slightest and you can leave the default (which is
     #   path-style, or :s3_path_url). But in some cases paths don't work and you need to use
@@ -159,7 +159,7 @@ def self.extended base
           "#{attachment.s3_protocol}://#{attachment.bucket_name}.s3.amazonaws.com/#{attachment.path(style).gsub(%r{^/}, "")}"
         end
       end
-      
+
       def expiring_url(time = 3600)
         AWS::S3::S3Object.url_for(path, bucket_name, :expires_in => time )
       end
@@ -176,7 +176,7 @@ def parse_credentials creds
         creds = find_credentials(creds).stringify_keys
         (creds[Rails.env] || creds).symbolize_keys
       end
-      
+
       def exists?(style = default_style)
         if original_filename
           AWS::S3::S3Object.exists?(path(style), bucket_name)
@@ -227,12 +227,12 @@ def flush_deletes #:nodoc:
         end
         @queued_for_delete = []
       end
-      
+
       def find_credentials creds
         case creds
         when File
           YAML::load(ERB.new(File.read(creds.path)).result)
-        when String
+        when String, Pathname
           YAML::load(ERB.new(File.read(creds)).result)
         when Hash
           creds

test/storage_test.rb

@@ -102,17 +102,17 @@ def rails_env(env)
                     :s3_host_alias => "something.something.com",
                     :path => ":attachment/:basename.:extension",
                     :url => ":s3_alias_url"
-                    
+
       rails_env("production")
-      
+
       @dummy = Dummy.new
       @dummy.avatar = StringIO.new(".")
-      
+
       AWS::S3::S3Object.expects(:url_for).with("avatars/stringio.txt", "prod_bucket", { :expires_in => 3600 })
-      
+
       @dummy.avatar.expiring_url
     end
-    
+
     should "should succeed" do
       assert true
     end
@@ -184,7 +184,7 @@ def rails_env(env)
           assert true
         end
       end
-      
+
       context "and remove" do
         setup do
           AWS::S3::S3Object.stubs(:exists?).returns(true)
@@ -198,15 +198,15 @@ def rails_env(env)
       end
     end
   end
-  
+
   context "An attachment with S3 storage and bucket defined as a Proc" do
     setup do
       AWS::S3::Base.stubs(:establish_connection!)
       rebuild_model :storage => :s3,
                     :bucket => lambda { |attachment| "bucket_#{attachment.instance.other}" },
                     :s3_credentials => {:not => :important}
     end
-    
+
     should "get the right bucket name" do
       assert "bucket_a", Dummy.new(:other => 'a').avatar.bucket_name
       assert "bucket_b", Dummy.new(:other => 'b').avatar.bucket_name
@@ -254,6 +254,28 @@ def rails_env(env)
     end
   end
 
+  context "with S3 credentials supplied as Pathname" do
+     setup do
+       ENV['S3_KEY']    = 'pathname_key'
+       ENV['S3_BUCKET'] = 'pathname_bucket'
+       ENV['S3_SECRET'] = 'pathname_secret'
+
+       rails_env('test')
+
+       rebuild_model :storage        => :s3,
+                     :s3_credentials => Pathname.new(File.join(File.dirname(__FILE__))).join("fixtures/s3.yml")
+
+       Dummy.delete_all
+       @dummy = Dummy.new
+     end
+
+     should "parse the credentials" do
+       assert_equal 'pathname_bucket', @dummy.avatar.bucket_name
+       assert_equal 'pathname_key', AWS::S3::Base.connection.options[:access_key_id]
+       assert_equal 'pathname_secret', AWS::S3::Base.connection.options[:secret_access_key]
+     end
+  end
+
   context "with S3 credentials in a YAML file" do
     setup do
       ENV['S3_KEY']    = 'env_key'