小编Pov*_*kys的帖子

我有模型公司和公司已经安装了carrierwave uploader Logo.

class Company < ActiveRecord::Base
  mount_uploader :logo, LogoUploader

图片上传工作,但我有update_attributes的问题.当用户想要仅更新公司的描述或标题,而不是上传新图像时 - DB中的文件名值每次都在更改.这是一个简单的例子:

1.9.3-p545 :004 > a = Company.last
1.9.3-p545 :005 > a.update_attributes(:title => "test title 2")
 (0.4ms)  BEGIN
  Company Exists (0.9ms)  SELECT 1 AS one FROM `companies` WHERE (`companies`.`title` = BINARY 'test title 2' AND `companies`.`id` != 37) LIMIT 1
  Company Load (0.7ms)  SELECT `companies`.* FROM `companies` WHERE `companies`.`id` = 37 LIMIT 1
   (0.7ms)  UPDATE `companies` SET `title` = 'test title 2', `logo` = '1396206630_1f288be4.jpg', `updated_at` = '2014-03-30 19:10:30' …