Inheritance is limited: with ActiveRecord, I'm forced to use a mapping strategy called single table inheritance (see Resources), which is not always optimal.
继承也受到限制：使用ActiveRecord时，我被迫使用单表继承映射策略，而该策略并不总是最佳选择。
In other words, a complete inheritance hierarchy is stored in a single database table.
换言之，整个继承层次结构存储在单个数据库表中。
In single-table inheritance, there is a single database table that contains columns for both base and derived classes.
在单表继承中，一个数据库表同时包含基类和派生类的列。
In single-table inheritance, there is a single database table that contains columns for both base and derived classes.
在单表继承中，一个数据库表同时包含基类和派生类的列。
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