Implement DatabaseCleaner in Rails 4

DatabaseCleaner上面的example过时了。按照示例去做的话，会报错 unknown method ‘before’。在github上找到了答案，还是比较简单的。

class ActiveSupport::TestCase
  include FactoryGirl::Syntax::Methods

  ActiveRecord::Migration.check_pending!
  DatabaseCleaner.strategy = :truncation
  DatabaseCleaner.logger = Rails.logger
  setup { DatabaseCleaner.start }
  teardown { DatabaseCleaner.clean }
end

配置完成以后，就可以在MYSQL去monitor query，看具体是如何操作数据库的。

mysql> SHOW VARIABLES LIKE "general_log%";

+------------------+----------------------------+
| Variable_name    | Value                      |
+------------------+----------------------------+
| general_log      | OFF                        |
| general_log_file | /var/run/mysqld/mysqld.log |
+------------------+----------------------------+

mysql> SET GLOBAL general_log = 'ON';

观察log

tail -f -n300 /var/run/mysqld/mysqld.log

最后，重置改动。

mysql> SET GLOBAL general_log = 'OFF';

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