Rake db：drop无法清除旧表 [英] Rake db:drop not clearing out my old tables

问题描述

我的用户迁移过去通常是这样的：

My User migration used to look like this:

class CreateUsers < ActiveRecord::Migration
  def change
    create_table :users do |t|
      t.string :login
      etc

现在看起来像这样：

class CreateUsers < ActiveRecord::Migration
  def change
    create_table :users do |t|
      t.string :username
      etc

为什么，我看到了吗

rake db:drop
rake db:create
rake db:migrate
rails console
> User.new
+----+-------+------------------+---------------+-------------------+------------+------------+
| id | login | crypted_password | password_salt | persistence_token | created_at | updated_at |
+----+-------+------------------+---------------+-------------------+------------+------------+
|    |       |                  |               |                   |            |            |
+----+-------+------------------+---------------+-------------------+------------+------------+
1 row in set

中的1行

我正在使用PostgreSQL。

I am using PostgreSQL.

推荐答案

增加用户迁移的文件名即可解决此问题。我假定Rails在尝试在不更改文件名的情况下更改其内容时就缓存了迁移的内容。

Incrementing the filename of the User migration solved the problem. I presume Rails was caching the contents of the migration when I tried to change its contents without changing the filename.

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