Purge or recreate a Ruby on Rails database

Question

I have a dev Ruby on Rails database full of data. I want to delete everything and rebuild the database. I\'m thinking of using something like:

rake db:recrea         


        

Answer 1

You can use this following command line:

rake db:drop db:create db:migrate db:seed db:test:clone

Answer 2

On Rails 4, all needed is

$ rake db:schema:load

That would delete the entire contents on your DB and recreate the schema from your schema.rb file, without having to apply all migrations one by one.

Answer 3

According to Rails guide, this one liner should be used because it would load from the schema.rb instead of reloading the migration files one by one:

rake db:reset

Answer 4

On rails 4.2, to remove all data but preserve the database

$ bin/rake db:purge && bin/rake db:schema:load

https://github.com/rails/rails/blob/4-2-stable/activerecord/CHANGELOG.md

Answer 5

Use like

rake db:drop db:create db:migrate db:seed

All in one line. This is faster since the environment doesn't get reloaded again and again.

db:drop - will drop database.

db:create - will create database (host/db/password will be taken from config/database.yml)

db:migrate - will run existing migrations from directory (db/migration/.rb)*.

db:seed - will run seed data possible from directory (db/migration/seed.rb)..

I usually prefer:

rake db:reset

to do all at once.

Cheers!

Answer 6

To drop a particular database, you can do this on rails console:

$rails console
Loading development environment
1.9.3 > ActiveRecord::Migration.drop_table(:<table_name>)
1.9.3 > exit

And then migrate DB again

$bundle exec rake db:migrate