Tweaked the interpolation matching so :id won't step on :id_partition.

git-svn-id: https://svn.thoughtbot.com/plugins/paperclip/trunk@458 7bbfaf0e-4d1d-0410-9690-a8bb5f8ef2aa

lib/paperclip/attachment.rb

@@ -148,7 +148,9 @@ module Paperclip
     def self.interpolations
       @interpolations ||= {
         :rails_root   => lambda{|attachment,style| RAILS_ROOT },
-        :class        => lambda{|attachment,style| attachment.instance.class.to_s.downcase.pluralize },
+        :class        => lambda do |attachment,style|
+                           attachment.instance.class.to_s.downcase.pluralize
+                         end,
         :basename     => lambda do |attachment,style|
                            attachment.original_filename.gsub(/\.(.*?)$/, "")
                          end,
@@ -157,7 +159,7 @@ module Paperclip
                            File.extname(attachment.original_filename).gsub(/^\.+/, "")
                          end,
         :id           => lambda{|attachment,style| attachment.instance.id },
-        :partition_id => lambda do |attachment, style|
+        :id_partition => lambda do |attachment, style|
                            ("%09d" % attachment.instance.id).scan(/\d{3}/).join("/")
                          end,
         :attachment   => lambda{|attachment,style| attachment.name.to_s.downcase.pluralize },
@@ -215,7 +217,7 @@ module Paperclip
       style ||= default_style
       pattern = pattern.dup
       self.class.interpolations.each do |tag, l|
-        pattern.gsub!(/:#{tag}/) do |match|
+        pattern.gsub!(/:\b#{tag}\b/) do |match|
           l.call( self, style )
         end
       end

test/test_attachment.rb

@@ -60,6 +60,22 @@ class AttachmentTest < Test::Unit::TestCase
     end
   end
 
+  context "An attachment with similarly named interpolations" do
+    setup do
+      rebuild_model :path => ":id.omg/:id-bbq/:idwhat/:id_partition.wtf"
+      @dummy = Dummy.new
+      @dummy.stubs(:id).returns(1024)
+      @file = File.new(File.join(File.dirname(__FILE__),
+                                 "fixtures",
+                                 "5k.png"))
+      @dummy.avatar = @file
+    end
+
+    should "make sure that they are interpolated correctly" do
+      assert_equal "1024.omg/1024-bbq/:idwhat/000/001/024.wtf", @dummy.avatar.path
+    end
+  end
+
   context "An attachment" do
     setup do
       Paperclip::Attachment.default_options.merge!({