$db public property The DB connection object or the application

$migrationCollection public property The name of the collection

getMigrationHistory() protected method Returns the migration

$templateFile public property The template file for generating

createMigration() protected method Creates a new migration

removeMigrationHistory() protected method Removes existing

options() public method Returns the names of valid options

addMigrationHistory() protected method Adds new migration

beforeAction() public method This method is invoked right

ensureBaseMigrationHistory() protected method Ensures