Removed warnings about #errors in Rails 3

lib/paperclip/matchers/validate_attachment_content_type_matcher.rb

@@ -57,7 +57,7 @@ module Paperclip
             file = StringIO.new(".")
             file.content_type = type
             (subject = @subject.new).attachment_for(@attachment_name).assign(file)
-            subject.valid? && subject.errors.on(:"#{@attachment_name}_content_type").blank?
+            subject.valid? && subject.errors[:"#{@attachment_name}_content_type"].blank?
           end
         end
 

lib/paperclip/matchers/validate_attachment_presence_matcher.rb

@@ -39,14 +39,14 @@ module Paperclip
         def error_when_not_valid?
           (subject = @subject.new).send(@attachment_name).assign(nil)
           subject.valid?
-          not subject.errors.on(:"#{@attachment_name}_file_name").blank?
+          not subject.errors[:"#{@attachment_name}_file_name"].blank?
         end
 
         def no_error_when_valid?
           @file = StringIO.new(".")
           (subject = @subject.new).send(@attachment_name).assign(@file)
           subject.valid?
-          subject.errors.on(:"#{@attachment_name}_file_name").blank?
+          subject.errors[:"#{@attachment_name}_file_name"].blank?
         end
       end
     end

lib/paperclip/matchers/validate_attachment_size_matcher.rb

@@ -69,7 +69,7 @@ module Paperclip
 
           (subject = @subject.new).send(@attachment_name).assign(file)
           subject.valid?
-          subject.errors.on(:"#{@attachment_name}_file_size").blank?
+          subject.errors[:"#{@attachment_name}_file_size"].blank?
         end
 
         def lower_than_low?

test/paperclip_test.rb

@@ -235,11 +235,11 @@ class PaperclipTest < Test::Unit::TestCase
           end
           if validation == :presence
             should "have an error on the attachment" do
-              assert @dummy.errors.on(:avatar_file_name)
+              assert @dummy.errors[:avatar_file_name]
             end
           else
             should "not have an error on the attachment" do
-              assert_nil @dummy.errors.on(:avatar_file_name), @dummy.errors.full_messages.join(", ")
+              assert @dummy.errors[:avatar_file_name].blank?, @dummy.errors.full_messages.join(", ")
             end
           end
         end
@@ -288,7 +288,7 @@ class PaperclipTest < Test::Unit::TestCase
         end
         
         should "have a file size min/max error message" do
-          assert_match %r/between 0 and 10240 bytes/, @dummy.errors.on(:avatar_file_size)
+          assert @dummy.errors[:avatar_file_size].any?{|e| e.match %r/between 0 and 10240 bytes/ }
         end
       end
     end