Is it just me or as the attribute accessor generation stuff not  
threadsafe?

Currently it seems to me like like the scenario could happen

- thread 1 calls foo=, hits method missing
- thread 1 checks if generated_methods is empty. It is
- thread 1 starts iterating over columns_hash and defining methods
- thread 2 calls zomg=, hits method_missing
- thread 2 checks if generated_methods is empty. It isn't because  
thread 1 has added at least one accessor to generated_methods, however  
it hasn't got as far as the zomg column
- thread 2 throws NoMethodError

Fred

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