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@@ -174,6 +174,10 @@ module Paperclip
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         post_process
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         old_original.close if old_original.respond_to?(:close)
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+
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+        @errors.empty?
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+      else
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+        true
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       end
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     end
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@@ -40,9 +40,13 @@ namespace :paperclip do
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   namespace :refresh do
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     desc "Regenerates thumbnails for a given CLASS (and optional ATTACHMENT)."
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     task :thumbnails => :environment do
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+      errors = []
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       for_all_attachments do |instance, name|
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-        instance.send(name).reprocess!
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+        result = instance.send(name).reprocess!
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+        errors << [instance.id, instance.errors] unless instance.errors.blank?
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+        result
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       end
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+      errors.each{|e| puts "#{e.first}: #{e.last.full_messages.inspect}" }
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     end
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     desc "Regenerates content_type/size metadata for a given CLASS (and optional ATTACHMENT)."