cached_find_by_statement

# File activerecord/lib/active_record/core.rb, line 300
        def cached_find_by_statement(key, &block)
          cache = @find_by_statement_cache[connection.prepared_statements]
          cache[key] || cache.synchronize {
            cache[key] ||= StatementCache.create(connection, &block)
          }
        end