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@@ -1,3 +1,6 @@
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+* April 2, 2007 *
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+
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+* Check for current type of :thumbnails option.
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 * allow customization of the S3 configuration file path with the :s3_config_path option.
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 * Don't try to remove thumbnails if there aren't any.  Closes #3 [ben stiglitz]
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@@ -46,6 +46,10 @@ module Technoweenie # :nodoc:
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         options[:s3_access]        ||= :public_read
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         options[:content_type] = [options[:content_type]].flatten.collect! { |t| t == :image ? Technoweenie::AttachmentFu.content_types : t }.flatten unless options[:content_type].nil?
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+        unless options[:thumbnails].is_a?(Hash)
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+          raise ArgumentError, ":thumbnails option should be a hash: e.g. :thumbnails => { :foo => '50x50' }"
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+        end
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+        
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         # doing these shenanigans so that #attachment_options is available to processors and backends
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         class_inheritable_accessor :attachment_options
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         self.attachment_options = options

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@@ -54,4 +54,11 @@ class BasicTest < Test::Unit::TestCase
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     @attachment.filename = 'foo.bar.baz'
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     assert_equal 'foo.bar_blah.baz', @attachment.thumbnail_name_for(:blah)
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   end
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+  
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+  def test_should_require_valid_thumbnails_option
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+    klass = Class.new(ActiveRecord::Base)
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+    assert_raise ArgumentError do
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+      klass.has_attachment :thumbnails => []
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+    end
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+  end
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 end
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