未定義的方法`has_db_column？'爲＃<通知：0xcc2b350>

Question

我在其他項目中使用過have_db_column，我不明白undefined method錯誤。
我也試過has_column

describe Notification do 
    context "has valid db fields" do 
    subject { Factory.build(:notification)} 
    it { should be_valid } 
    it { should have_db_column(:title)} 
    end 
end 

mysql> describe notifications; 
+---------------------+--------------+------+-----+---------+----------------+ 
| Field    | Type   | Null | Key | Default | Extra   | 
+---------------------+--------------+------+-----+---------+----------------+ 
| id     | int(11)  | NO | PRI | NULL | auto_increment | 
| title    | varchar(255) | YES |  | NULL |    | 

Factory.define :notification do |notification| 
    notification.title {'test'} 
end 

Answer 1

看起來你並沒有包括在spec_helper.rb早該的匹配。