diff --git a/docs/api/db/ActiveRecord.md b/docs/api/db/ActiveRecord.md
index 0120998..70f171b 100644
--- a/docs/api/db/ActiveRecord.md
+++ b/docs/api/db/ActiveRecord.md
@@ -175,7 +175,7 @@ class Customer extends \yii\db\ActiveRecord
 {
 	public function getOrders()
 	{
-		return $this->hasMany('Order', ['customer_id' => 'id']);
+		return $this->hasMany(Order::className(), ['customer_id' => 'id']);
 	}
 }
 
@@ -183,7 +183,7 @@ class Order extends \yii\db\ActiveRecord
 {
 	public function getCustomer()
 	{
-		return $this->hasOne('Customer', ['id' => 'customer_id']);
+		return $this->hasOne(Customer::className(), ['id' => 'customer_id']);
 	}
 }
 ~~~
@@ -194,8 +194,7 @@ a one-many relationship. For example, a customer has many orders. And the [[hasO
 method declares a many-one or one-one relationship. For example, an order has one customer.
 Both methods take two parameters:
 
-- `$class`: the name of the class related models should use. If specified without
-  a namespace, the namespace will be taken from the declaring class.
+- `$class`: the name of the class that the related models should use.
 - `$link`: the association between columns from two tables. This should be given as an array.
   The keys of the array are the names of the columns from the table associated with `$class`,
   while the values of the array are the names of the columns from the declaring class.
@@ -223,7 +222,7 @@ class Customer extends \yii\db\ActiveRecord
 {
 	public function getBigOrders($threshold = 100)
 	{
-		return $this->hasMany('Order', ['customer_id' => 'id'])
+		return $this->hasMany(Order::className(), ['customer_id' => 'id'])
 			->where('subtotal > :threshold', [':threshold' => $threshold])
 			->orderBy('id');
 	}
@@ -244,7 +243,7 @@ class Order extends \yii\db\ActiveRecord
 {
 	public function getItems()
 	{
-		return $this->hasMany('Item', ['id' => 'item_id'])
+		return $this->hasMany(Item::className(), ['id' => 'item_id'])
 			->viaTable('tbl_order_item', ['order_id' => 'id']);
 	}
 }
@@ -259,12 +258,12 @@ class Order extends \yii\db\ActiveRecord
 {
 	public function getOrderItems()
 	{
-		return $this->hasMany('OrderItem', ['order_id' => 'id']);
+		return $this->hasMany(OrderItem::className(), ['order_id' => 'id']);
 	}
 
 	public function getItems()
 	{
-		return $this->hasMany('Item', ['id' => 'item_id'])
+		return $this->hasMany(Item::className(), ['id' => 'item_id'])
 			->via('orderItems');
 	}
 }
diff --git a/docs/guide/active-record.md b/docs/guide/active-record.md
index 3de4a01..e0d16c9 100644
--- a/docs/guide/active-record.md
+++ b/docs/guide/active-record.md
@@ -202,7 +202,7 @@ class Customer extends \yii\db\ActiveRecord
 {
 	public function getOrders()
 	{
-		return $this->hasMany('Order', ['customer_id' => 'id']);
+		return $this->hasMany(Order::className, ['customer_id' => 'id']);
 	}
 }
 
@@ -210,7 +210,7 @@ class Order extends \yii\db\ActiveRecord
 {
 	public function getCustomer()
 	{
-		return $this->hasOne('Customer', ['id' => 'customer_id']);
+		return $this->hasOne(Customer::className(), ['id' => 'customer_id']);
 	}
 }
 ```
@@ -257,7 +257,7 @@ class Customer extends \yii\db\ActiveRecord
 {
 	public function getBigOrders($threshold = 100)
 	{
-		return $this->hasMany('Order', ['customer_id' => 'id'])
+		return $this->hasMany(Order::className(), ['customer_id' => 'id'])
 			->where('subtotal > :threshold', [':threshold' => $threshold])
 			->orderBy('id');
 	}
@@ -291,7 +291,7 @@ class Order extends \yii\db\ActiveRecord
 {
 	public function getItems()
 	{
-		return $this->hasMany('Item', ['id' => 'item_id'])
+		return $this->hasMany(Item::className(), ['id' => 'item_id'])
 			->viaTable('tbl_order_item', ['order_id' => 'id']);
 	}
 }
@@ -306,12 +306,12 @@ class Order extends \yii\db\ActiveRecord
 {
 	public function getOrderItems()
 	{
-		return $this->hasMany('OrderItem', ['order_id' => 'id']);
+		return $this->hasMany(OrderItem::className(), ['order_id' => 'id']);
 	}
 
 	public function getItems()
 	{
-		return $this->hasMany('Item', ['id' => 'item_id'])
+		return $this->hasMany(Item::className(), ['id' => 'item_id'])
 			->via('orderItems');
 	}
 }
@@ -517,7 +517,7 @@ class Feature extends \yii\db\ActiveRecord
 
 	public function getProduct()
 	{
-		return $this->hasOne('Product', ['product_id' => 'id']);
+		return $this->hasOne(Product::className(), ['product_id' => 'id']);
 	}
 }
 
@@ -527,7 +527,7 @@ class Product extends \yii\db\ActiveRecord
 
 	public function getFeatures()
 	{
-		return $this->hasMany('Feature', ['id' => 'product_id']);
+		return $this->hasMany(Feature::className(), ['id' => 'product_id']);
 	}
 }
 ```
@@ -566,7 +566,7 @@ class Feature extends \yii\db\ActiveRecord
 
 	public function getProduct()
 	{
-		return $this->hasOne('Product', ['product_id' => 'id']);
+		return $this->hasOne(Product::className(), ['product_id' => 'id']);
 	}
 
 	public function scenarios()
@@ -586,7 +586,7 @@ class Product extends \yii\db\ActiveRecord
 
 	public function getFeatures()
 	{
-		return $this->hasMany('Feature', ['id' => 'product_id']);
+		return $this->hasMany(Feature::className(), ['id' => 'product_id']);
 	}
 
 	public function scenarios()
diff --git a/framework/yii/db/ActiveRecord.php b/framework/yii/db/ActiveRecord.php
index 3f158cf..806a6c1 100644
--- a/framework/yii/db/ActiveRecord.php
+++ b/framework/yii/db/ActiveRecord.php
@@ -456,7 +456,7 @@ class ActiveRecord extends Model
 	 * ~~~
 	 * public function getCountry()
 	 * {
-	 *     return $this->hasOne('Country', ['id' => 'country_id']);
+	 *     return $this->hasOne(Country::className(), ['id' => 'country_id']);
 	 * }
 	 * ~~~
 	 *
@@ -475,7 +475,7 @@ class ActiveRecord extends Model
 	public function hasOne($class, $link)
 	{
 		return new ActiveRelation([
-			'modelClass' => $this->getNamespacedClass($class),
+			'modelClass' => $class,
 			'primaryModel' => $this,
 			'link' => $link,
 			'multiple' => false,
@@ -496,7 +496,7 @@ class ActiveRecord extends Model
 	 * ~~~
 	 * public function getOrders()
 	 * {
-	 *     return $this->hasMany('Order', ['customer_id' => 'id']);
+	 *     return $this->hasMany(Order::className(), ['customer_id' => 'id']);
 	 * }
 	 * ~~~
 	 *
@@ -513,7 +513,7 @@ class ActiveRecord extends Model
 	public function hasMany($class, $link)
 	{
 		return new ActiveRelation([
-			'modelClass' => $this->getNamespacedClass($class),
+			'modelClass' => $class,
 			'primaryModel' => $this,
 			'link' => $link,
 			'multiple' => true,
@@ -1439,24 +1439,6 @@ class ActiveRecord extends Model
 	}
 
 	/**
-	 * Changes the given class name into a namespaced one.
-	 * If the given class name is already namespaced, no change will be made.
-	 * Otherwise, the class name will be changed to use the same namespace as
-	 * the current AR class.
-	 * @param string $class the class name to be namespaced
-	 * @return string the namespaced class name
-	 */
-	protected static function getNamespacedClass($class)
-	{
-		if (strpos($class, '\\') === false) {
-			$reflector = new \ReflectionClass(static::className());
-			return $reflector->getNamespaceName() . '\\' . $class;
-		} else {
-			return $class;
-		}
-	}
-
-	/**
 	 * @param array $link
 	 * @param ActiveRecord $foreignModel
 	 * @param ActiveRecord $primaryModel
diff --git a/tests/unit/data/ar/Customer.php b/tests/unit/data/ar/Customer.php
index 441b37c..60a68b5 100644
--- a/tests/unit/data/ar/Customer.php
+++ b/tests/unit/data/ar/Customer.php
@@ -24,7 +24,7 @@ class Customer extends ActiveRecord
 
 	public function getOrders()
 	{
-		return $this->hasMany('Order', ['customer_id' => 'id'])->orderBy('id');
+		return $this->hasMany(Order::className(), ['customer_id' => 'id'])->orderBy('id');
 	}
 
 	public static function active($query)
diff --git a/tests/unit/data/ar/Order.php b/tests/unit/data/ar/Order.php
index b6392ed..6d5e926 100644
--- a/tests/unit/data/ar/Order.php
+++ b/tests/unit/data/ar/Order.php
@@ -19,17 +19,17 @@ class Order extends ActiveRecord
 
 	public function getCustomer()
 	{
-		return $this->hasOne('Customer', ['id' => 'customer_id']);
+		return $this->hasOne(Customer::className(), ['id' => 'customer_id']);
 	}
 
 	public function getOrderItems()
 	{
-		return $this->hasMany('OrderItem', ['order_id' => 'id']);
+		return $this->hasMany(OrderItem::className(), ['order_id' => 'id']);
 	}
 
 	public function getItems()
 	{
-		return $this->hasMany('Item', ['id' => 'item_id'])
+		return $this->hasMany(Item::className(), ['id' => 'item_id'])
 			->via('orderItems', function ($q) {
 				// additional query configuration
 			})->orderBy('id');
@@ -37,7 +37,7 @@ class Order extends ActiveRecord
 
 	public function getBooks()
 	{
-		return $this->hasMany('Item', ['id' => 'item_id'])
+		return $this->hasMany(Item::className(), ['id' => 'item_id'])
 			->viaTable('tbl_order_item', ['order_id' => 'id'])
 			->where(['category_id' => 1]);
 	}
diff --git a/tests/unit/data/ar/OrderItem.php b/tests/unit/data/ar/OrderItem.php
index ad931a8..b340a46 100644
--- a/tests/unit/data/ar/OrderItem.php
+++ b/tests/unit/data/ar/OrderItem.php
@@ -19,11 +19,11 @@ class OrderItem extends ActiveRecord
 
 	public function getOrder()
 	{
-		return $this->hasOne('Order', ['id' => 'order_id']);
+		return $this->hasOne(Order::className(), ['id' => 'order_id']);
 	}
 
 	public function getItem()
 	{
-		return $this->hasOne('Item', ['id' => 'item_id']);
+		return $this->hasOne(Item::className(), ['id' => 'item_id']);
 	}
 }