如何自定义 Rails 3 STI 列名 [英] How to customize Rails 3 STI column name

问题描述

我有一个名为 Post 的类:

I have a class named Post:

class Post < ActiveRecord::Base
end

我有一个名为 Question 的类，它继承自 Post:

I have a class named Question that inheriting from Post:

class Question < Post
end

我有一个名为 Answer 的类，它也继承自Post":

and I have a class named Answer that also inheriting from 'Post':

class Answer < Post
end

在Post 中，我有一个名为post_type_id 的列，其类型为Integer.
我如何使用 STI 和特定的列名 &类型继承自 Post?0 表示Question，1 表示Answer.(0 & 1 是posts表中post_type_id的值)

In Post, I have a column named post_type_id and its' type is Integer.
How do I use STI and specific column name & type to inherit from Post? 0 means Question and 1 means Answer. (0 & 1 is the value of post_type_id in posts table)

推荐答案

您可以像这样更改单表继承列的名称:

You can change the name of the single table inheritance column like so:

class Post < ActiveRecord::Base
  self.inheritance_column = 'type_column_name'

end

但是，没有办法让 Rails 使用整数而不是将实际类型存储为字符串，这让我觉得这可能不是单目标继承的好用例.也许范围更适合您:

However, there is no way to cause Rails to use integers instead of storing the actual type as a string, which makes me think that this may not be a great use case for single target inheritance. Perhaps a scope would suit you better instead:

class Post < ActiveRecord::Base
  scope :questions, where(:post_type_id => 0)
  scope :answers, where(:post_type_id => 1)

end

@questions = Post.questions.all
@answers = Post.answers.all

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