Do I have to "rake db:migrate" all the time when I committed fully migrated repository in github?
For example, I committed the rails repository in c9.io to github.
It was fully "rake db:migrate"d and didn't need to migrate.
But when I cloned my github repository and executed it,
there was a problem that " hasn't been migrated and you need to rake db:migrate"
I want to know what "really rake db:migrate" meaning in rails
and why cloned repo does need "rake db:migrate" all the time