我有一个 Rails 迁移:
>> cat db/migrate/20091126031039_create_cards.rb
class CreateCards < ActiveRecord::Migration
def self.up
create_table :cards do |t|
t.string :number_hash
t.int :number
t.string :name
t.string :type
t.string :expiration
t.int :sec_code
t.timestamps
end
end
def self.down
drop_table :cards
end
end
注意“t.int :sec_code”行。它似乎执行成功:
>> rake db:migrate(in /Users/aaronj1335/Sites/clarkbox)
== CreateCards: migrating ====================================================
-- create_table(:cards)
-> 0.4315s
== CreateCards: migrated (0.4317s) ===========================================
但未创建“sec_code”列:
mysql> describe cards;
+-------------+--------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-------------+--------------+------+-----+---------+----------------+
| id | int(11) | NO | PRI | NULL | auto_increment |
| number_hash | varchar(255) | YES | | NULL | |
| name | varchar(255) | YES | | NULL | |
| type | varchar(255) | YES | | NULL | |
| expiration | varchar(255) | YES | | NULL | |
| created_at | datetime | YES | | NULL | |
| updated_at | datetime | YES | | NULL | |
+-------------+--------------+------+-----+---------+----------------+
7 rows in set (0.00 sec)
为什么没有创建 sec_code 列?看来我应该得到一个错误...