diff --git a/framework/yii/base/Widget.php b/framework/yii/base/Widget.php
index a0f77958ee..c64cdf485a 100644
--- a/framework/yii/base/Widget.php
+++ b/framework/yii/base/Widget.php
@@ -121,7 +121,7 @@ class Widget extends Component implements ViewContextInterface
 	 * The [[render()]] and [[renderFile()]] methods will use
 	 * this view object to implement the actual view rendering.
 	 * If not set, it will default to the "view" application component.
-	 * @return View the view object that can be used to render views or view files.
+	 * @return \yii\web\View the view object that can be used to render views or view files.
 	 */
 	public function getView()
 	{
diff --git a/framework/yii/grid/ActionColumn.php b/framework/yii/grid/ActionColumn.php
index 2ee1db2910..707d41151d 100644
--- a/framework/yii/grid/ActionColumn.php
+++ b/framework/yii/grid/ActionColumn.php
@@ -32,27 +32,27 @@ class ActionColumn extends Column
 	protected function initDefaultButtons()
 	{
 		if (!isset($this->buttons['view'])) {
-			$this->buttons['view'] = function ($model, $column) {
+			$this->buttons['view'] = function ($model, $key, $index, $column) {
 				/** @var ActionColumn $column */
-				$url = $column->createUrl($model, 'view');
+				$url = $column->createUrl($model, $key, $index, 'view');
 				return Html::a('<span class="glyphicon glyphicon-eye-open"></span>', $url, [
 					'title' => Yii::t('yii', 'View'),
 				]);
 			};
 		}
 		if (!isset($this->buttons['update'])) {
-			$this->buttons['update'] = function ($model, $column) {
+			$this->buttons['update'] = function ($model, $key, $index, $column) {
 				/** @var ActionColumn $column */
-				$url = $column->createUrl($model, 'update');
+				$url = $column->createUrl($model, $key, $index, 'update');
 				return Html::a('<span class="glyphicon glyphicon-pencil"></span>', $url, [
 					'title' => Yii::t('yii', 'Update'),
 				]);
 			};
 		}
 		if (!isset($this->buttons['delete'])) {
-			$this->buttons['delete'] = function ($model, $column) {
+			$this->buttons['delete'] = function ($model, $key, $index, $column) {
 				/** @var ActionColumn $column */
-				$url = $column->createUrl($model, 'delete');
+				$url = $column->createUrl($model, $key, $index, 'delete');
 				return Html::a('<span class="glyphicon glyphicon-trash"></span>', $url, [
 					'title' => Yii::t('yii', 'Delete'),
 					'data-confirm' => Yii::t('yii', 'Are you sure to delete this item?'),
@@ -64,34 +64,30 @@ class ActionColumn extends Column
 
 	/**
 	 * @param \yii\db\ActiveRecord $model
+	 * @param mixed $key the key associated with the data model
+	 * @param integer $index
 	 * @param string $action
 	 * @return string
 	 */
-	public function createUrl($model, $action)
+	public function createUrl($model, $key, $index, $action)
 	{
 		if ($this->urlCreator instanceof Closure) {
-			return call_user_func($this->urlCreator, $model, $action);
+			return call_user_func($this->urlCreator, $model, $key, $index, $action);
 		} else {
-			$params = $model->getPrimaryKey(true);
-			if (count($params) === 1) {
-				$params = ['id' => reset($params)];
-			}
+			$params = is_array($key) ? $key : ['id' => $key];
 			return Yii::$app->controller->createUrl($action, $params);
 		}
 	}
 
 	/**
-	 * Renders the data cell content.
-	 * @param mixed $model the data model
-	 * @param integer $index the zero-based index of the data model among the models array returned by [[dataProvider]].
-	 * @return string the rendering result
+	 * @inheritdoc
 	 */
-	protected function renderDataCellContent($model, $index)
+	protected function renderDataCellContent($model, $key, $index)
 	{
-		return preg_replace_callback('/\\{(\w+)\\}/', function ($matches) use ($model) {
+		return preg_replace_callback('/\\{(\w+)\\}/', function ($matches) use ($model, $key, $index) {
 			$name = $matches[1];
 			if (isset($this->buttons[$name])) {
-				return call_user_func($this->buttons[$name], $model, $this);
+				return call_user_func($this->buttons[$name], $model, $key, $index, $this);
 			} else {
 				return '';
 			}
diff --git a/framework/yii/grid/CheckboxColumn.php b/framework/yii/grid/CheckboxColumn.php
index 23f7ed03e1..6970d4b372 100644
--- a/framework/yii/grid/CheckboxColumn.php
+++ b/framework/yii/grid/CheckboxColumn.php
@@ -67,15 +67,12 @@ class CheckboxColumn extends Column
 	}
 
 	/**
-	 * Renders the data cell content.
-	 * @param mixed $model the data model
-	 * @param integer $index the zero-based index of the data model among the models array returned by [[dataProvider]].
-	 * @return string the rendering result
+	 * @inheritdoc
 	 */
-	protected function renderDataCellContent($model, $index)
+	protected function renderDataCellContent($model, $key, $index)
 	{
 		if ($this->checkboxOptions instanceof Closure) {
-			$options = call_user_func($this->checkboxOptions, $model, $index, $this);
+			$options = call_user_func($this->checkboxOptions, $model, $key, $index, $this);
 		} else {
 			$options = $this->checkboxOptions;
 		}
diff --git a/framework/yii/grid/Column.php b/framework/yii/grid/Column.php
index fa49147c95..5cc4c423ce 100644
--- a/framework/yii/grid/Column.php
+++ b/framework/yii/grid/Column.php
@@ -71,17 +71,18 @@ class Column extends Object
 	/**
 	 * Renders a data cell.
 	 * @param mixed $model the data model being rendered
+	 * @param mixed $key the key associated with the data model
 	 * @param integer $index the zero-based index of the data item among the item array returned by [[dataProvider]].
 	 * @return string the rendering result
 	 */
-	public function renderDataCell($model, $index)
+	public function renderDataCell($model, $key, $index)
 	{
 		if ($this->contentOptions instanceof Closure) {
-			$options = call_user_func($this->contentOptions, $model, $index, $this);
+			$options = call_user_func($this->contentOptions, $model, $key, $index, $this);
 		} else {
 			$options = $this->contentOptions;
 		}
-		return Html::tag('td', $this->renderDataCellContent($model, $index), $options);
+		return Html::tag('td', $this->renderDataCellContent($model, $key, $index), $options);
 	}
 
 	/**
@@ -117,13 +118,14 @@ class Column extends Object
 	/**
 	 * Renders the data cell content.
 	 * @param mixed $model the data model
+	 * @param mixed $key the key associated with the data model
 	 * @param integer $index the zero-based index of the data model among the models array returned by [[dataProvider]].
 	 * @return string the rendering result
 	 */
-	protected function renderDataCellContent($model, $index)
+	protected function renderDataCellContent($model, $key, $index)
 	{
 		if ($this->content !== null) {
-			return call_user_func($this->content, $model, $index, $this);
+			return call_user_func($this->content, $model, $key, $index, $this);
 		} else {
 			return $this->grid->emptyCell;
 		}
diff --git a/framework/yii/grid/DataColumn.php b/framework/yii/grid/DataColumn.php
index bd6eacb733..d51af8fb3e 100644
--- a/framework/yii/grid/DataColumn.php
+++ b/framework/yii/grid/DataColumn.php
@@ -133,14 +133,17 @@ class DataColumn extends Column
 		}
 	}
 
-	protected function renderDataCellContent($model, $index)
+	/**
+	 * @inheritdoc
+	 */
+	protected function renderDataCellContent($model, $key, $index)
 	{
 		if ($this->value !== null) {
 			$value = call_user_func($this->value, $model, $index, $this);
 		} elseif ($this->content === null && $this->attribute !== null) {
 			$value = ArrayHelper::getValue($model, $this->attribute);
 		} else {
-			return parent::renderDataCellContent($model, $index);
+			return parent::renderDataCellContent($model, $key, $index);
 		}
 		return $this->grid->formatter->format($value, $this->format);
 	}
diff --git a/framework/yii/grid/GridView.php b/framework/yii/grid/GridView.php
index 9e470177f4..35d89b2593 100644
--- a/framework/yii/grid/GridView.php
+++ b/framework/yii/grid/GridView.php
@@ -366,7 +366,7 @@ class GridView extends BaseListView
 		$cells = [];
 		/** @var Column $column */
 		foreach ($this->columns as $column) {
-			$cells[] = $column->renderDataCell($model, $index);
+			$cells[] = $column->renderDataCell($model, $key, $index);
 		}
 		if ($this->rowOptions instanceof Closure) {
 			$options = call_user_func($this->rowOptions, $model, $key, $index, $this);
diff --git a/framework/yii/grid/SerialColumn.php b/framework/yii/grid/SerialColumn.php
index 6a875ae664..8179ead0ef 100644
--- a/framework/yii/grid/SerialColumn.php
+++ b/framework/yii/grid/SerialColumn.php
@@ -18,12 +18,9 @@ class SerialColumn extends Column
 	public $header = '#';
 
 	/**
-	 * Renders the data cell content.
-	 * @param mixed $model the data model
-	 * @param integer $index the zero-based index of the data model among the models array returned by [[dataProvider]].
-	 * @return string the rendering result
+	 * @inheritdoc
 	 */
-	protected function renderDataCellContent($model, $index)
+	protected function renderDataCellContent($model, $key, $index)
 	{
 		$pagination = $this->grid->dataProvider->getPagination();
 		if ($pagination !== false) {