访问计划定义按什么顺序访问表，使用哪些索引，以及用何种连接(join)方法来关联数据。

An access plan defines the order for accessing tables, which indexes are used, and by what kind of join methods data is correlated.

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这个方法使用当前状态和事件类型作为关联数组的索引，从 actionTransitionFunctions 表中选择要调用的函数。

The method does select a function to call from the actionTransitionFunctions table using the current state and event type as associative array indexes.

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保留索引、借助include使用热加载和在某些地方使用多态关联代替继承是三种可用来改进代码库的方法。

Keeping up with your indexes, using eager loading with include, and using polymorphic associations in places instead of inheritance are just three ways you can use to improve your code base.

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