Rails的遷移文件失敗 - Mysql2 ::錯誤：數據截斷

Question

列

我已經成立了一個新的遷移文件：

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

我運行它這樣我的Debian服務器上（鋼軌4.2.1紅寶石2.1 ）

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

然後我得到這個錯誤：

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' 

請告訴我這個問題？

Answer 1

您可以使用change_column_null

class ChangeCourseDefaults < ActiveRecord::Migration 
    def change 
    change_column_null :table_name, :column_name, false, 0 # set default as 0 
    end 
end 

Answer 2

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

參考：change_column_null for existing column