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@@ -71,8 +71,8 @@ module Technoweenie # :nodoc:
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         with_options :foreign_key => 'parent_id' do |m|
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           m.has_many   :thumbnails, :class_name => attachment_options[:thumbnail_class].to_s
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-          m.belongs_to :parent, :class_name => base_class.to_s
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-        end unless options[:thumbnails].empty?
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+          m.belongs_to :parent, :class_name => base_class.to_s unless options[:thumbnails].empty?
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+        end
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         storage_mod = Technoweenie::AttachmentFu::Backends.const_get("#{options[:storage].to_s.classify}Backend")
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         include storage_mod unless included_modules.include?(storage_mod)

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@@ -157,8 +157,10 @@ class RmagickTest < Test::Unit::TestCase
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         assert_valid attachment
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       end
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       assert_kind_of ImageThumbnail,  attachment.thumbnails.first
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-      assert_equal attachment.id,     attachment.thumbnails.first.parent.id
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-      assert_kind_of FileAttachment,  attachment.thumbnails.first.parent
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+      if attachment.thumbnails.first.respond_to?(:parent)
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+        assert_equal attachment.id,     attachment.thumbnails.first.parent.id
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+        assert_kind_of FileAttachment,  attachment.thumbnails.first.parent
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+      end
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       assert_equal 'rails_thumb.png', attachment.thumbnails.first.filename
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       assert_equal attachment.thumbnails.first.full_filename, attachment.full_filename(attachment.thumbnails.first.thumbnail),
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         "#full_filename does not use thumbnail class' path."
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@@ -250,4 +252,4 @@ class RmagickTest < Test::Unit::TestCase
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       puts "RMagick not installed, no tests running"
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     end
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   end
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-end
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\ No newline at end of file
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+end