Fixes #1402: AR eager loading has problem when asArray() is used together with viaTable().

framework/yii/db/ActiveQueryTrait.php

@@ -146,7 +146,7 @@ trait ActiveQueryTrait
 	 * Finds records corresponding to one or multiple relations and populates them into the primary models.
 	 * @param array $with a list of relations that this query should be performed with. Please
 	 * refer to [[with()]] for details about specifying this parameter.
-	 * @param ActiveRecord[] $models the primary models
+	 * @param array $models the primary models (can be either AR instances or arrays)
 	 */
 	public function findWith($with, &$models)
 	{

framework/yii/db/ActiveRelationTrait.php

@@ -236,7 +236,7 @@ trait ActiveRelationTrait
 	}
 
 	/**
-	 * @param ActiveRecord[] $primaryModels
+	 * @param array $primaryModels either array of AR instances or arrays
 	 * @return array
 	 */
 	private function findPivotRows($primaryModels)
@@ -247,6 +247,10 @@ trait ActiveRelationTrait
 		$this->filterByModels($primaryModels);
 		/** @var ActiveRecord $primaryModel */
 		$primaryModel = reset($primaryModels);
+		if (!$primaryModel instanceof ActiveRecordInterface) {
+			// when primaryModels are array of arrays (asArray case)
+			$primaryModel = new $this->modelClass;
+		}
 		return $this->asArray()->all($primaryModel->getDb());
 	}
 }

tests/unit/framework/ar/ActiveRecordTestTrait.php

@@ -411,6 +411,10 @@ trait ActiveRecordTestTrait
 		$this->assertTrue($customer->isRelationPopulated('orders'));
 		$this->assertEquals(1, count($customer->orders));
 		$this->assertEquals(1, count($customer->populatedRelations));
+
+		// https://github.com/yiisoft/yii2/issues/1402
+		$orders = $this->callOrderFind()->with('books')->asArray()->all();
+		$this->assertEquals(3, count($orders));
 	}
 
 	public function testFindLazyVia()