Question

我已经设置了一个新的迁移文件：

class ChangeCourseDefaults < ActiveRecord::Migration
  def self.up
    change_column_null :course_objects, :active, false
    change_column_default :course_objects, :active, 0
  end
end

我在我的debian服务器上运行它（rails 4.2.1 ruby 2.1）

sudo bundle exec rake db:migrate:up VERSION=20150720095700 RAILS_ENV=test

然后我收到了这个错误：

Mysql2::Error: Data truncated for column 'active' at row 1: ALTER TABLE `course_objects` CHANGE `active` `active` tinyint(1) NOT NULL/var/www/html/test/xyz/vendor/bundle/ruby/2.1.0/gems/activerecord-4..2.1/lib/active_record/connection_adapters/abstract_mysql_adapter.rb:299:in `query'

问题是什么？

Answer 1

您可以使用 change_column_null

getsockname()

Answer 2

class ChangeCourseDefaults < ActiveRecord::Migration
  def change
    change_column_null :course_objects, :active, false, 0
  end
end

参考：change_column_null for existing column

Rails迁移文件失败 - Mysql2 ::错误：列的数据被截断

2 个答案: