从schema.rb生成迁移文件

本文介绍了从schema.rb生成迁移文件的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我正在寻找从schema.rb生成一个迁移文件.是否有可能?

I'm looking to generate a migration file from the schema.rb. is it possible?

目前我有许多迁移文件，并希望将所有内容合并到一个主迁移文件中.

I have many migration files at the moment and would like to combine everything into one master migration file.

我还认为我有时可能不小心删除了迁移文件.

I also think i may have accidentally deleted a migration file at some point.

感谢您的帮助

推荐答案

不需要这样做.对于新安装，您应该运行rake db:schema:load而不是rake db:migrate，这会将架构加载到数据库中，比运行所有迁移要快.

There's no need to do this. For new installations you should be running rake db:schema:load, not rake db:migrate, this will load the schema into the database, which is faster than running all the migrations.

您永远不应删除迁移，并且绝对不能将它们合并在一起.对于意外删除的情况，您应该使用版本控制系统，例如 Git .

You should never delete migrations, and certainly not combine them. As for accidentally deleting one, you should be using a version control system, such as Git.