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Ruby%20On%20Rails%20Interview%20Questions%20and%20Answers

Question: How can you migrate your database schema one level down?
Answer:

The rake tool does most of the migrations. 

It has this nifty syntax to go back one step:

rake db:rollback

If you want to rollback all the way to the beginning you would use:

rake db:reset

This would drop the database, recreate the Database and load the current schema into it

If you want to rollback multiple steps at the same time you would use:

rake db:rollback STEP=3

To rollback all the way and if you are not worried about losing the data then you can drop the database completely with purge like this:

rake db:purge
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