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@@ -407,13 +407,14 @@ module Fleximage
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         def perform_preprocess_operation
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           if self.class.preprocess_image_operation
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             operate(&self.class.preprocess_image_operation)
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+            set_magic_attributes #update width and height magic columns
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             @uploaded_image = @output_image
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           end
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         end
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         # If any magic column names exists fill them with image meta data.
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-        def set_magic_attributes(file)
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-          if self.respond_to?(:image_filename=)
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+        def set_magic_attributes(file = nil)
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+          if file && self.respond_to?(:image_filename=)
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             filename = file.original_filename if file.respond_to?(:original_filename)
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             filename = file.basename          if file.respond_to?(:basename)
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             self.image_filename = filename

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@@ -14,5 +14,4 @@ class FleximageMagicColumnsTest < Test::Unit::TestCase
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     assert_equal 110,   p.image_height
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     assert_equal 276,   p.image_width
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   end
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-  
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 end