Test Your Migrations

Today I discovered rake db:migrate:redo. This command rolls back a migration, and then runs the migration again. It's a convenience method for checking your work and iterating through complex migrations.

The Hashrocket Dotmatrix leverages this via the twiki method:

twiki () {
  rake db:migrate && rake db:migrate:redo && rake db:test:prepare
}

Migrate the database, then roll it back, then migrate it again, then rebuild the test database. If anything is wrong going up or coming down, this will catch it.

h/t Josh Branchaud