CODEWITHSUNDEEP
ruby-on-railsdatabaseseeding
Blankman
Blankman

Reputation: 267120

Reset the database (purge all), then seed a database

Is there a rake command to wipe out the data in the database tables?

How do I create a db:seed script to pre-fill data to my tables?

Upvotes: 169

Views: 125759

Answers (7)

Moshe Edri
Moshe Edri

Reputation: 31

Please follow below commands:

  1. rails db:migrate:reset

  2. rails db:seed again

Upvotes: 1

MZaragoza
MZaragoza

Reputation: 10111

on Rails 6 you can now do something like

rake db:seed:replant This Truncates tables of each database for current environment and loads the seeds

https://blog.saeloun.com/2019/09/30/rails-6-adds-db-seed-replant-task-and-db-truncate_all.html

$ rails db:seed:replant --trace
** Invoke db:seed:replant (first_time)
** Invoke db:load_config (first_time)
** Invoke environment (first_time)
** Execute environment
** Execute db:load_config
** Invoke db:truncate_all (first_time)
** Invoke db:load_config
** Invoke db:check_protected_environments (first_time)
** Invoke db:load_config
** Execute db:check_protected_environments
** Execute db:truncate_all
** Invoke db:seed (first_time)
** Invoke db:load_config
** Execute db:seed
** Invoke db:abort_if_pending_migrations (first_time)
** Invoke db:load_config
** Execute db:abort_if_pending_migrations
** Execute db:seed:replant

Upvotes: 8

Nesha Zoric
Nesha Zoric

Reputation: 6640

You can use rake db:reset when you want to drop the local database and start fresh with data loaded from db/seeds.rb. This is a useful command when you are still figuring out your schema, and often need to add fields to existing models.

Once the reset command is used it will do the following: Drop the database: rake db:drop Load the schema: rake db:schema:load Seed the data: rake db:seed

But if you want to completely drop your database you can use rake db:drop. Dropping the database will also remove any schema conflicts or bad data. If you want to keep the data you have, be sure to back it up before running this command.

This is a detailed article about the most important rake database commands.

Upvotes: 0

DazBaldwin
DazBaldwin

Reputation: 4305

As of Rails 5, the rake commandline tool has been aliased as rails so now

rails db:reset instead of rake db:reset

will work just as well

Upvotes: 12

Tom Hundt
Tom Hundt

Reputation: 1850

If you don't feel like dropping and recreating the whole shebang just to reload your data, you could use MyModel.destroy_all (or delete_all) in the seed.db file to clean out a table before your MyModel.create!(...) statements load the data. Then, you can redo the db:seed operation over and over. (Obviously, this only affects the tables you've loaded data into, not the rest of them.)

There's a "dirty hack" at https://stackoverflow.com/a/14957893/4553442 to add a "de-seeding" operation similar to migrating up and down...

Upvotes: 8

laffuste
laffuste

Reputation: 17095

You can delete everything and recreate database + seeds with both:

  1. rake db:reset: loads from schema.rb
  2. rake db:drop db:create db:migrate db:seed: loads from migrations

Make sure you have no connections to db (rails server, sql client..) or the db won't drop.

schema.rb is a snapshot of the current state of your database generated by:

rake db:schema:dump

Upvotes: 173

JackCA
JackCA

Reputation: 4885

I use rake db:reset which drops and then recreates the database and includes your seeds.rb file. http://guides.rubyonrails.org/migrations.html#resetting-the-database

Upvotes: 297

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