rake db:test:prepare 实际上做了什么? [英] What does rake db:test:prepare actually do?

问题描述

我正在关注 rails 教程视频，但我无法弄清楚 db:test:prepare 命令实际上做了什么.有人可以提供解释吗?

I am following the rails tutorial videos and I can't figure out what the db:test:prepare command actually does. Can someone provide an explanation?

推荐答案

上面的 rake db:migrate 在开发环境和更新 db/schema.rb.耙子db:test:load 从当前数据库重新创建测试数据库db/schema.rb.在随后的尝试中，最好先运行db:test:prepare，因为它首先检查挂起的迁移并发出警告你适当地.

The rake db:migrate above runs any pending migrations on the development environment and updates db/schema.rb. The rake db:test:load recreates the test database from the current db/schema.rb. On subsequent attempts, it is a good idea to first run db:test:prepare, as it first checks for pending migrations and warns you appropriately.

-- http://guides.rubyonrails.org/testing.html

基本上它处理克隆数据库，因此您不必针对测试运行迁移来更新测试数据库.

Basically it handles cloning the database so you don't have to run the migrations against test to update the test database.

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