diff --git a/extensions/sphinx/ActiveRecord.php b/extensions/sphinx/ActiveRecord.php
index 15ef719..a5f8c71 100644
--- a/extensions/sphinx/ActiveRecord.php
+++ b/extensions/sphinx/ActiveRecord.php
@@ -253,11 +253,16 @@ class ActiveRecord extends Model
 
 	/**
 	 * Returns the primary key name for this AR class.
-	 * @return string the primary key of the associated Sphinx index.
+	 * The default implementation will return the primary key as declared
+	 * in the Sphinx index, which is associated with this AR class.
+	 *
+	 * Note that an array should be returned even for a table with single primary key.
+	 *
+	 * @return string[] the primary keys of the associated Sphinx index.
 	 */
 	public static function primaryKey()
 	{
-		return static::getIndexSchema()->primaryKey;
+		return [static::getIndexSchema()->primaryKey];
 	}
 
 	/**
@@ -861,8 +866,9 @@ class ActiveRecord extends Model
 		}
 		$values = $this->getDirtyAttributes($attributes);
 		if (empty($values)) {
-			$key = $this->primaryKey();
-			$values[$key] = isset($this->_attributes[$key]) ? $this->_attributes[$key] : null;
+			foreach ($this->primaryKey() as $key) {
+				$values[$key] = isset($this->_attributes[$key]) ? $this->_attributes[$key] : null;
+			}
 		}
 		$db = static::getDb();
 		$command = $db->createCommand()->insert($this->indexName(), $values);
@@ -1231,12 +1237,15 @@ class ActiveRecord extends Model
 	 */
 	public function getPrimaryKey($asArray = false)
 	{
-		$key = $this->primaryKey();
-		$value = isset($this->_attributes[$key]) ? $this->_attributes[$key] : null;
-		if ($asArray) {
-			return [$key => $value];
+		$keys = $this->primaryKey();
+		if (count($keys) === 1 && !$asArray) {
+			return isset($this->_attributes[$keys[0]]) ? $this->_attributes[$keys[0]] : null;
 		} else {
-			return $value;
+			$values = [];
+			foreach ($keys as $name) {
+				$values[$name] = isset($this->_attributes[$name]) ? $this->_attributes[$name] : null;
+			}
+			return $values;
 		}
 	}
 
@@ -1254,12 +1263,15 @@ class ActiveRecord extends Model
 	 */
 	public function getOldPrimaryKey($asArray = false)
 	{
-		$key = $this->primaryKey();
-		$value = isset($this->_oldAttributes[$key]) ? $this->_oldAttributes[$key] : null;
-		if ($asArray) {
-			return [$key => $value];
+		$keys = $this->primaryKey();
+		if (count($keys) === 1 && !$asArray) {
+			return isset($this->_oldAttributes[$keys[0]]) ? $this->_oldAttributes[$keys[0]] : null;
 		} else {
-			return $value;
+			$values = [];
+			foreach ($keys as $name) {
+				$values[$name] = isset($this->_oldAttributes[$name]) ? $this->_oldAttributes[$name] : null;
+			}
+			return $values;
 		}
 	}
 
diff --git a/extensions/sphinx/QueryBuilder.php b/extensions/sphinx/QueryBuilder.php
index 498fb92..e21e620 100644
--- a/extensions/sphinx/QueryBuilder.php
+++ b/extensions/sphinx/QueryBuilder.php
@@ -493,7 +493,7 @@ class QueryBuilder extends Object
 			if (is_object($direction)) {
 				$orders[] = (string)$direction;
 			} else {
-				$orders[] = $this->db->quoteColumnName($name) . ($direction === SORT_DESC ? ' DESC' : '');
+				$orders[] = $this->db->quoteColumnName($name) . ($direction === SORT_DESC ? ' DESC' : 'ASC');
 			}
 		}
 
diff --git a/tests/unit/extensions/sphinx/ActiveDataProviderTest.php b/tests/unit/extensions/sphinx/ActiveDataProviderTest.php
new file mode 100644
index 0000000..17a0970
--- /dev/null
+++ b/tests/unit/extensions/sphinx/ActiveDataProviderTest.php
@@ -0,0 +1,42 @@
+<?php
+
+namespace yiiunit\extensions\sphinx;
+
+use yii\data\ActiveDataProvider;
+use yiiunit\data\sphinx\ar\ActiveRecord;
+use yiiunit\data\sphinx\ar\ArticleIndex;
+
+/**
+ * @group sphinx
+ */
+class ActiveDataProviderTest extends SphinxTestCase
+{
+	protected function setUp()
+	{
+		parent::setUp();
+		ActiveRecord::$db = $this->getConnection();
+	}
+
+	// Tests :
+
+	public function testActiveQuery()
+	{
+		$provider = new ActiveDataProvider([
+			'query' => ArticleIndex::find()->orderBy('id ASC'),
+		]);
+		$models = $provider->getModels();
+		$this->assertEquals(2, count($models));
+		$this->assertTrue($models[0] instanceof ArticleIndex);
+		$this->assertTrue($models[1] instanceof ArticleIndex);
+		$this->assertEquals([1, 2], $provider->getKeys());
+
+		$provider = new ActiveDataProvider([
+			'query' => ArticleIndex::find(),
+			'pagination' => [
+				'pageSize' => 1,
+			]
+		]);
+		$models = $provider->getModels();
+		$this->assertEquals(1, count($models));
+	}
+}
\ No newline at end of file