How to use rake db: migrate

Question

I just want to collapse one version, but I don’t know the current version, is there a command to check it?

Answer 1

First, it’s worth the time to read the Rails Guide regarding migration . Then for your specific question:

... rollback of one version:

rake db:rollback STEP=1

... to see the current version:

rake db:version

Answer 2

VERSION , . "", . , db/migrate ( ). , .

STEP, .

Answer 3

Migrations have a time stamp. It is safe to assume that the last timestamp is the current migration in most cases.

http://guides.rubyonrails.org/migrations.html#rolling-back