Rails 3中列名称为"type"的问题 [英] issue with column name 'type' in rails 3

问题描述

我的一个表中有一列名为"type"的列.当我尝试像group.type一样访问它时，出现以下错误:

I have a columns named 'type' in one of my tables. When I try to access it like group.type, I got the following error:

super: no superclass method `type' for #<Group:0x000000035eaf30> 

但是，当我尝试使用迁移来重命名列时，出现以下错误

However, when I try to rename the column using a migration, I get the following error

No such column: groups.type (migration failed)

我尝试使用查询直接在mysql数据库中重命名该列，但这也不起作用.

I tried to rename the column directly in the mysql db, using a query, but that doesn't work either.

mysql> alter table groups change type group_type int(11);
ERROR 1054 (42S22): Unknown column 'type' in 'groups'

请帮助.

推荐答案

该错误来自ActiveRecord附带的单表继承功能.只需告诉它使用不同于type的列即可:

The error comes from the single table inheritance feature that comes with ActiveRecord. Just tell it to use a different column than type:

class Group < ActiveRecord::Base

  self.inheritance_column = "not_sti"

  #...
end

有了它，您不必重命名列.

With that, you don't have to rename the column.

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