什么是：force =>在模式文件中的真实意义

问题描述

如果你看看db / schema.rb，你会看到如下：

  create_tableusers > true do | t | 
  

：force => ：

基本上，这有助于确保数据库的完整性。如果您手动处理迁移，那么确保您从一个干净的平面创建新表，而不是冒着从一次性创建的表中冒出命名冲突的风险。

If you look in db/schema.rb you will see something like:

create_table "users", :force => true do |t|

What does the :force => true mean?

解决方案

From the Rails docs:

Basically, this helps ensure database integrity. If you're manually tooling around with your migrations, it's helpful to ensure that you're creating new tables from a clean slate, rather than risking naming conflicts that stem from tables that have been created on a one-off basis.

这篇关于什么是：force =>在模式文件中的真实意义的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！