Ruby on rails 定量或其他。架构包含属性，我没有错过迁移。您对活动模型有任何回调吗？我运行了rake db:test:prepare，它更改了错误。我仍然有一个问题，但我现在可以在rails控制台中设置这个字段，这样我原来的问题就解决了。谢谢 1.9.3p393 :008

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定量或其他。架构包含属性，我没有错过迁移。您对

活动

模型有任何回调吗？我运行了rake db:test:prepare，它更改了错误。我仍然有一个问题，但我现在可以在rails控制台中设置这个字段，这样我原来的问题就解决了。谢谢

1.9.3p393 :008 > campy = Campaign.last
  Campaign Load (0.8ms)  SELECT `campaigns`.* FROM `campaigns` ORDER BY `campaigns`.`id` DESC LIMIT 1
 => #<Campaign id: 3, name: "Stuff", ..., approved_at: nil, approval_requested_at: nil> 
1.9.3p393 :009 > campy.approved_at = Time.now
 => 2013-07-01 00:54:38 +0200 
1.9.3p393 :010 > campy.save
   (0.2ms)  BEGIN
   (0.2ms)  COMMIT
 => true 
1.9.3p393 :011 > campy.approved_at
 => 2013-07-01 00:54:38 +0200 
1.9.3p393 :012 > Campaign.last.approved_at
  Campaign Load (0.7ms)  SELECT `campaigns`.* FROM `campaigns` ORDER BY `campaigns`.`id` DESC LIMIT 1
 => nil 
1.9.3p393 :013 > campy = Campaign.last
  Campaign Load (0.6ms)  SELECT `campaigns`.* FROM `campaigns` ORDER BY `campaigns`.`id` DESC LIMIT 1
 => #<Campaign id: 3, name: "Stuff", ..., approved_at: nil, approval_requested_at: nil> 
1.9.3p393 :014 > campy.approved_at = Time.now
 => 2013-07-01 00:55:11 +0200 
1.9.3p393 :015 > campy.save
   (0.3ms)  BEGIN
   (0.2ms)  COMMIT
 => true 
1.9.3p393 :016 > Campaign.last.approved_at
  Campaign Load (0.7ms)  SELECT `campaigns`.* FROM `campaigns` ORDER BY `campaigns`.`id` DESC LIMIT 1
 => nil 

1.9.3p393 :027 > campy.approved_at = Time.now
 => 2013-07-01 01:19:05 +0200 
1.9.3p393 :028 > campy.save
   (0.2ms)  BEGIN
   (0.2ms)  COMMIT
 => true 
1.9.3p393 :029 > campy.approved_at
 => 2013-07-01 01:19:05 +0200 
1.9.3p393 :030 > campy
 => #<Campaign id: 3, name: "Stuff", ... , approved_at: nil, approval_requested_at: nil>