better_error_message_on_unsupported_type.diff

Index: thinking-sphinx/lib/thinking_sphinx/attribute.rb
===================================================================
--- thinking-sphinx/lib/thinking_sphinx/attribute.rb	(revision 809)
+++ thinking-sphinx/lib/thinking_sphinx/attribute.rb	(working copy)
@@ -102,14 +102,17 @@
     end
     
     def type_to_config
-      {
+      supported_types = {
         :multi    => :sql_attr_multi,
         :datetime => :sql_attr_timestamp,
         :string   => :sql_attr_str2ordinal,
         :float    => :sql_attr_float,
         :boolean  => :sql_attr_bool,
         :integer  => :sql_attr_uint
-      }[type]
+      }
+      config = supported_types[type]
+      raise "Cannot automatically determine config for type :#{type} (attribute:#{unique_name}). You may need to specify #{unique_name} :type => X, where X is one of [#{supported_types.keys.map { |k| ":#{k}" }.join(',')}]" if config.nil?
+      config
     end
     
     def config_value