Rails3.1.1でDEPRECATION WARNINGが頻発した http://wp.gessy0129.com/rails3-1-1でdeprecation-warningが頻発した/2012/01/12/
これで解決しました。
More than 5 years have passed since last update.
DEPRECATION WARNING: primary_key_name is deprecated and will be removed from Rails 3.2 (use foreign_key instead).
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