Rails STI和“类型”的设置。串

问题描述

我想我需要在Rails中使用STI。

I think I need to use STI in Rails.

这是我的课程：

class Person < ActiveRecord::Base
end

class Landlord < Person
end

并且人员表有一个：type 这是一个字符串的列。

and the people table has a :type column that's a string.

所以，我期望在表中看到的是，作为Person的每一行都有类型集人和每个房东的类型设置为房东。但是，这不是我所看到的。每个房东的类型都设置为Landlord，但所有Person的类型都设置为nil。这很好可能是rails的工作方式，但我只是在寻找一些确认。

So, what I expect is to see in the table, is that every row that is a Person has the type set to "Person" and every Landlord has the type set to "Landlord". However, that's not what I see. Each Landlord has the type set to "Landlord", but all the Person have their type set to nil. This very well could be the way that rails works, but I was just looking for some confirmation.

推荐答案

这确实是STI的工作原理。基类在数据库中的类型为NULL（或者在ruby中为nil）。

This is, indeed, how STI works. The base class has a type of NULL in the database (or nil in ruby).

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