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@@ -113,6 +113,12 @@ module Paperclip
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     def has_attached_file name, options = {}
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       include InstanceMethods
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+      %w(file_name content_type).each do |field|
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+        unless column_names.include?("#{name}_#{field}")
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+          raise PaperclipError.new("#{self} model does not have required column '#{name}_#{field}'")
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+        end
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+      end
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+
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       write_inheritable_attribute(:attachment_definitions, {}) if attachment_definitions.nil?
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       attachment_definitions[name] = {:validations => []}.merge(options)
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@@ -7,6 +7,14 @@ class PaperclipTest < Test::Unit::TestCase
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       @file = File.new(File.join(FIXTURES_DIR, "5k.png"))
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     end
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+    should "error when trying to also create a 'blah' attachment" do
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+      assert_raises(Paperclip::PaperclipError) do
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+        Dummy.class_eval do
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+          has_attached_file :blah
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+        end
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+      end
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+    end
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+
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     context "that is attr_protected" do
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       setup do
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         Dummy.class_eval do