rake_migration.rb

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driver.rb migration.rb persistence.rb rake_migration.rb spec.rb

rake_migration.rb
¶

Example of [Data Migration][migration] with Rake Task.

Including db:migration task.
```
require 'mongo/migration/tasks'
```
¶

The db:migration task depends on non-existing db:migration_evnironment task. You need to define this task and perform there all preparations needed for migration.

Let's suppose that You are using some framework (Rails for example) and it has task :environment for preparing framework environment.

We make our db:migration_evnironment dependent on the framework's :environment. So, Your framework will be properly initialized and available in migration scripts.
```
desc "Internal task to prepare migration environment"
task 'db:migration_evnironment' => 'environment' do
  require 'mongo/migration'
```
¶

Usually migrations are defined as files in some folder, loading it.
```
  Dir["./db/**/*.rb"].each{|f| require f.sub(/\.rb$/, '')}
end
```
¶

Now You can migrate Your database (if You omit version the highest availiable will be choosen).
```
rake db:migrate d=my_database_name v=10
```