nilify_blanks 1.4.0
Often times you'll end up with empty strings where you really want nil at the database level. This plugin automatically converts blanks to nil and is configurable.
          Gemfile:
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          安装:
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      Runtime 依赖 (2):
            activerecord
            >= 4.0.0
          
          
            activesupport
            >= 4.0.0