ActiveRecord在使用参考完整性约束的某些场合也会出现问题，因为某些类型的关联可能连接到多个数据库表。
ActiveRecord also has trouble in some cases with referential integrity constraints because some types of associations might connect to more than one database table.
ActiveRecord在使用参考完整性约束的某些场合也会出现问题，因为某些类型的关联可能连接到多个数据库表。
ActiveRecord also has trouble in some cases with referential integrity constraints because some types of associations might connect to more than one database table.
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