Rails 3.2 ActiveRecord の自動 EXPLAIN に関するメモ - Qiita

def logging_query_plan # :nodoc: return yield unless logger threshold = auto_explain_threshold_in_seconds current = Thread.current if connection.supports_explain? && threshold && current[:available_queries_for_explain].nil? begin queries = current[:available_queries_for_explain] = [] start = Time.now result = yield logger.warn(exec_explain(queries)) if Time.now - start > threshold result ensure cu