canvas-lms/db/migrate/20111010205553_drop_deleted...

17 lines
847 B
Ruby

class DropDeletedUniqueIdFromPseudonyms < ActiveRecord::Migration
def self.up
Pseudonym.where("deleted_unique_id IS NOT NULL AND workflow_state='deleted'").update_all('unique_id=deleted_unique_id')
remove_column :pseudonyms, :deleted_unique_id
end
def self.down
add_column :pseudonyms, :deleted_unique_id, :string
Pseudonym.where("unique_id IS NOT NULL AND workflow_state='deleted'").update_all('deleted_unique_id=unique_id')
if %w{MySQL Mysql2}.include?(Pseudonym.connection.adapter_name)
Pseudonym.where("unique_id IS NOT NULL AND workflow_state='deleted'").update_all("unique_id=unique_id || '--' || SUBSTR(RAND(), 3, 4)")
else
Pseudonym.where("unique_id IS NOT NULL AND workflow_state='deleted'").update_all("unique_id=unique_id || '--' || SUBSTR(CAST(RANDOM() AS varchar), 3, 4)")
end
end
end