diff --git a/extensions/sphinx/Schema.php b/extensions/sphinx/Schema.php
index 5afb445..557becd 100644
--- a/extensions/sphinx/Schema.php
+++ b/extensions/sphinx/Schema.php
@@ -86,9 +86,6 @@ class Schema extends \yii\db\mysql\Schema
 			$table->columns[$column->name] = $column;
 			if ($column->isPrimaryKey) {
 				$table->primaryKey[] = $column->name;
-				if ($column->autoIncrement) {
-					$table->sequenceName = '';
-				}
 			}
 		}
 		return true;
@@ -104,9 +101,9 @@ class Schema extends \yii\db\mysql\Schema
 		$column = new ColumnSchema;
 
 		$column->name = $info['Field'];
+		$column->isPrimaryKey = ($column->name == 'id');
 		// Not supported :
 		//$column->allowNull = $info['Null'] === 'YES';
-		//$column->isPrimaryKey = strpos($info['Key'], 'PRI') !== false;
 		//$column->autoIncrement = stripos($info['Extra'], 'auto_increment') !== false;
 		//$column->comment = $info['Comment'];
 
diff --git a/tests/unit/data/sphinx/sphinx.conf b/tests/unit/data/sphinx/sphinx.conf
index fb28525..e58166c 100644
--- a/tests/unit/data/sphinx/sphinx.conf
+++ b/tests/unit/data/sphinx/sphinx.conf
@@ -1,6 +1,13 @@
+# Sphinx configuration for the unit tests
 #
-# Minimal Sphinx configuration sample (clean, simple, functional)
-#
+# Setup test environment:
+# - initialize test database source:
+# mysql -D yii2test -u test < /path/to/yii/tests/unit/data/sphinx/sphinx.sql
+# - setup test Sphinx indexes:
+# indexer --config /path/to/yii/tests/unit/data/sphinx/sphinx.conf --all [--rotate]
+# - run the "searchd" daemon:
+# searchd --config /path/to/yii/tests/unit/data/sphinx/sphinx.conf
+
 
 source yii2_test_article_src
 {
@@ -19,6 +26,7 @@ source yii2_test_article_src
 	sql_attr_uint		= id
 	sql_attr_uint		= author_id
 	sql_attr_timestamp	= add_date
+	sql_attr_multi		= uint tag from query; SELECT article_id AS id, tag_id AS tag FROM yii2_test_article_tag
 
 	sql_query_info		= SELECT * FROM yii2_test_article WHERE id=$id
 }
diff --git a/tests/unit/data/sphinx/sphinx.sql b/tests/unit/data/sphinx/sphinx.sql
index b6a2ef7..1cdd5ae 100644
--- a/tests/unit/data/sphinx/sphinx.sql
+++ b/tests/unit/data/sphinx/sphinx.sql
@@ -26,3 +26,16 @@ CREATE TABLE IF NOT EXISTS `yii2_test_item` (
 INSERT INTO `yii2_test_item` (`id`, `name`, `description`, `category_id`, `price`) VALUES
 (1, 'pencil', 'Simple pencil', 1, 2.5),
 (2, 'table', 'Wooden table', 2, 100);
+
+CREATE TABLE IF NOT EXISTS `yii2_test_article_tag` (
+  `article_id` int(11) NOT NULL,
+  `tag_id` int(11) NOT NULL,
+  PRIMARY KEY (`article_id`,`tag_id`)
+) ENGINE=MyISAM DEFAULT CHARSET=utf8;
+
+INSERT INTO `yii2_test_article_tag` (`article_id`, `tag_id`) VALUES
+(1, 1),
+(1, 2),
+(1, 3),
+(2, 3),
+(2, 4);
\ No newline at end of file