$db public property The DB connection object or the application

$migrationCollection public property The name of the collection

addMigrationHistory() protected method Adds new migration

$templateFile public property The template file for generating

options() public method Returns the names of valid options

removeMigrationHistory() protected method Removes existing

createMigration() protected method Creates a new migration

getMigrationHistory() protected method Returns the migration

beforeAction() public method This method is invoked right

ensureBaseMigrationHistory() protected method Ensures