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 db:reset - for run db:drop and db:setup or db:migrate:reset - which runs db:drop, db:create and db:migrate.

dependent at you want to use exist schema.rb

Answer 2

Depending on what you're wanting, you can use…

rake db:create

…to build the database from scratch from config/database.yml, or…

rake db:schema:load

…to build the database from scratch from your schema.rb file.

Answer 3

I use the following one liner in Terminal.

$ rake db:drop && rake db:create && rake db:migrate && rake db:schema:dump && rake db:test:prepare

I put this as a shell alias and named it remigrate

By now, you can easily "chain" Rails tasks:

$ rake db:drop db:create db:migrate db:schema:dump db:test:prepare # db:test:prepare no longer available since Rails 4.1.0.rc1+

Answer 4

Just issue the sequence of the steps: drop the database, then re-create it again, migrate data, and if you have seeds, sow the database:

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

Since the default environment for rake is development, in case if you see the exception in spec tests, you should re-create db for the test environment as follows:

RAILS_ENV=test rake db:drop db:create db:migrate

In most cases the test database is being sowed during the test procedures, so db:seed task action isn't required to be passed. Otherwise, you shall to prepare the database:

rake db:test:prepare

or

RAILS_ENV=test rake db:seed

Additionally, to use the recreate task you can add into Rakefile the following code:

namespace :db do
   task :recreate => [ :drop, :create, :migrate ] do
      if ENV[ 'RAILS_ENV' ] !~ /test|cucumber/
         Rake::Task[ 'db:seed' ].invoke
      end
   end
end

Then issue:

rake db:recreate

Answer 5

Update: In Rails 5, this command will be accessible through this command:

rails db:purge db:create db:migrate RAILS_ENV=test

---

As of the newest rails 4.2 release you can now run:

rake db:purge 

Source: commit

# desc "Empty the database from DATABASE_URL or config/database.yml for the current RAILS_ENV (use db:drop:all to drop all databases in the config). Without RAILS_ENV it defaults to purging the development and test databases."
  task :purge => [:load_config] do
    ActiveRecord::Tasks::DatabaseTasks.purge_current
  end

It can be used together like mentioned above:

rake db:purge db:create db:migrate RAILS_ENV=test

Answer 6

From the command line run

rake db:migrate:reset