Added basis for migrations deciding what db connection to use, refs #6

classes/minion/migration/base.php

@@ -10,6 +10,40 @@
  */
 abstract class Minion_Migration_Base {
 
+	/**
+	 * Array of information about this migration
+	 * @var array
+	 */
+	protected $_info = array();
+
+	/**
+	 * Constructs the migration
+	 *
+	 * @param array Information about this migration
+	 */
+	public function __construct(array $info)
+	{
+		$this->_info = $info;
+	}
+
+	/**
+	 * Get the name of the database connection group this migration should be run against
+	 *
+	 * @return string
+	 */
+	public function get_database_connection()
+	{
+		$config   = Kohana::config('minion/migration');
+		$location = $this->_info['location'];
+
+		if(isset($config->location_connection[$location]))
+		{
+			return $config->location_connection[$location];
+		}
+
+		return Database::$default;
+	}
+
 	/**
 	 * Runs any SQL queries necessary to bring the database up a migration version
 	 *

classes/minion/migration/manager.php

@@ -153,7 +153,6 @@ class Minion_Migration_Manager {
 	public function run_migration(array $locations = array(), $versions = array(), $default_direction = TRUE)
 	{
 		$migrations = $this->_model->fetch_required_migrations($locations, $versions, $default_direction);
-		$db         = $this->_get_db_instance();
 
 		foreach($migrations as $path => $location)
 		{
@@ -176,24 +175,14 @@ class Minion_Migration_Manager {
 
 				$class = Minion_Migration_Util::get_class_from_migration($migration);
 
-				$db->query(NULL, 'START TRANSACTION');
-
-				try
-				{
-					include_once $file;
-
-					$instance = new $class;
-
-					$instance->$method($db);
-				}
-				catch(Exception $e)
-				{
-					$db->query(NULL, 'ROLLBACK');
-
-					throw $e;
-				}
 				
-				$db->query(NULL, 'COMMIT');
+				include_once $file;
+
+				$instance = new $class($migration);
+
+				$db = $this->_get_db_instance($instance->get_database_connection());
+
+				$instance->$method($db);
 
 				if($this->_dry_run)
 				{
@@ -275,15 +264,14 @@ class Minion_Migration_Manager {
 	/**
 	 * Gets a database connection for running the migrations
 	 *
+	 * @param  string Database connection group name
 	 * @return Kohana_Database Database connection
 	 */
-	protected function _get_db_instance()
+	protected function _get_db_instance($db_group)
 	{
-		// If this isn't a dry run then just use the normal database connection
+		// If this isn't a dry run then just use a normal database connection
 		if( ! $this->_dry_run)
-			return $this->_db;
-
-		$db_group = array_search($this->_db, Database::$instances);
+			return Database::instance($db_group);
 
 		return Minion_Migration_Database::faux_instance($db_group);
 	}

config/minion/migration.php

@@ -2,10 +2,8 @@
 
 
 return array(
-
-	// Allows you to map an environment to a specific database config group
-	'db_connections' => array(
-		'development' => 'default',
-		'unittest'    => 'unittest'
+	// A mapping of location_connections => db_connection to use
+	'location_connection' => array(
+		
 	),
 );