DataMigration

DataMigration adds the ability to create data migration files (similar to Rails schema migrations) and migrate them. The main benefit is they are separate from Rails schema migrations and can therefore be run at different stages.

Use cases

• Run 'one off' rake tasks
• Run data inserts/updates, separate from schema migrations

Installation

Add this line to your application's Gemfile:

gem 'data_migration', github: 'ashmckenzie/data_migration'

And then execute:

$ bundle

Usage

Add data migration support

$ rails generate data_migration:install
$ rake db:migrate

This drops a new schema migration into db/migrate called YYYYMMDDHHMMSS_add_data_migration_support.rb and creates a new data_migrations table.

Adding new data migrations

$ rails generate data_migration:new <name_of_migration>
$ rake db:data_migrate

Rolling back data migrations

Using STEP=n

$ rake db:data_migrate:rollback STEP=1

Using VERSION=YYYYMMDDHHMMSS

$ rake db:data_migrate:rollback VERSION=YYYYMMDDHHMMSS

Data migrations status

$ rake db:data_migrate:status

TODO

1. Specs!

Contributing

1. Fork it
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request