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

3 options, same result:

1. All steps:

  $ rake db:drop           # deletes the database for the current env
  $ rake db:create         # creates the database for the current env
  $ rake db:schema:load    # loads the schema already generated from schema.rb / erases data
  $ rake db:seed           # seed with initial data

2. Reset:

  $ rake db:reset          # drop / schema:load / seed

3. Migrate:reset:

  $ rake db:migrate:reset  # drop / create / migrate
  $ rake db:seed

Notes:

• If schema:load is used is faster than doing all migrations, but same result.
• All data will be lost.
• You can run multiple rakes in one line.
• Works with rails 3.

Answer 2

I've today made quite a few changes to my rails schema. I realised I needed an additional two models in a hierarchy and some others to be deleted. There were many little changes required to the models and controllers.

I added the two new models and created them, using:

rake db:migrate

Then I edited the schema.rb file. I manually removed the old models that were no longer required, changed the foreign key field as required and just reordered it a bit to make it clearer to me. I deleted all the migrations, and then re-ran the build via:

rake db:reset

It worked perfectly. All the data has to be reloaded, of course. Rails realised the migrations had been deleted and reset the high-water mark:

-- assume_migrated_upto_version(20121026094813, ["/Users/sean/rails/f4/db/migrate"])

Answer 3

I know two ways to do this:

This will reset your database and reload your current schema with all:

rake db:reset db:migrate

This will destroy your db and then create it and then migrate your current schema:

rake db:drop db:create db:migrate

All data will be lost in both scenarios.

Answer 4

You can manually do:

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

Or just rake db:reset, which will run the above steps but will also run your db/seeds.rb file.

An added nuance is that rake db:reset loads directly from your schema.rb file as opposed to running all the migrations files again.

You data gets blown away in all cases.

Answer 5

I think the best way to run this command:

**rake db:reset** it does db:drop, db:setup
 rake db:setup does db:create, db:schema:load, db:seed

Answer 6

Simply you can run

rake db:setup

It will drop database, create new database and populate db from seed if you created seed file with some data.