How do you rake a Heroku database?

I have an application on Heroku. However, whenever I change my database locally and then push the changes to the application, the database doesn't not change.

I realized that I need to run a rake on the Heroku database. However when I try heroku rake db:migrate I get the following error.

rake aborted! uninitialized constant Rake::DSL`

How do I solve this problem?

I've been improvising with heroku db:push, but 开发者_开发问答that will not be able to hold because it deletes the current database.

If you are using the new Cedar Stack, you should use

heroku run rake db:migrate

Use:

heroku rake db:version

Source:

http://devcenter.heroku.com/articles/rake

Append w/ "heroku" or just type "heroku" in your terminal for instructions

heroku rake db:migrate 

Your error for rake aborted! Uninitialized constant Rake::DSL is probably down to rake versions - see Stack Overflow question Ruby on Rails and Rake problems: uninitialized constant Rake::DSL for a fix.