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@@ -6,8 +6,8 @@ end
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 def obtain_attachments
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   name = ENV['ATTACHMENT'] || ENV['attachment']
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-  raise "Class #{@klass.name} has no attachments specified" unless @klass.respond_to?(:attachment_names)
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-  if !name.blank? && @klass.attachment_names.include?(name)
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+  raise "Class #{@klass.name} has no attachments specified" unless @klass.respond_to?(:attachment_definitions)
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+  if !name.blank? && @klass.attachment_definitions.keys.include?(name)
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     [ name ]
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   else
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     @klass.attachment_definitions.keys
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@@ -19,9 +19,10 @@ namespace :paperclip do
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   task :refresh => :environment do
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     klass     = obtain_class
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     names     = obtain_attachments
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+    instances = klass.find(:all)
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     puts "Regenerating thumbnails for #{instances.length} instances of #{klass.name}:"
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-    klass.find(:all).each do |instance|
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+    instances.each do |instance|
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       names.each do |name|
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         result = if instance.send("#{ name }?")
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           instance.send(name).send("post_process")