mysql_warning_is_error.rb

# config/environments/development.rb
# ActiveRecord 3.2.8 / mysql2 0.3.11
Application.configure do
  config.after_initialize do
    class ActiveRecord::ConnectionAdapters::Mysql2Adapter
      def execute_with_warning_is_error(sql, *rest)
        result = execute_without_warning_is_error(sql, *rest)

        warnings = execute_without_warning_is_error('show warnings', :skip_logging).to_a

        unless warnings.empty?
          raise "SQL実行中にwarning出ました!!!!! SQL: #{sql}, warnings: #{warnings.inspect}"
        end

        result
      end
      alias_method_chain :execute, :warning_is_error
    end
  end
end