# Class yii\rest\Action

Inheritance | yii\rest\Action » yii\base\Action » yii\base\Component » yii\base\BaseObject
Implements | yii\base\Configurable
Subclasses | yii\rest\CreateAction, yii\rest\DeleteAction, yii\rest\IndexAction, yii\rest\UpdateAction, yii\rest\ViewAction
Available since version | 2.0
Source Code | https://github.com/yiisoft/yii2/blob/master/framework/rest/Action.php

Action is the base class for action classes that implement RESTful API.

For more details and usage information on Action, see the guide article on rest controllers.

## Public Properties

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Property | Type | Description | Defined By
--- | --- | --- | ---
$behaviors | yii\base\Behavior[] | List of behaviors attached to this component. This property is read-only. | yii\base\Component
$checkAccess | callable | A PHP callable that will be called when running an action to determine if the current user has the permission to execute the action. | yii\rest\Action
$controller | yii\base\Controller|yii\web\Controller|yii\console\Controller | The controller that owns this action | yii\base\Action
$findModel | callable | A PHP callable that will be called to return the model corresponding to the specified primary key value. | yii\rest\Action
$id | string | ID of the action | yii\base\Action
$modelClass | string | Class name of the model which will be handled by this action. | yii\rest\Action
$uniqueId | string | The unique ID of this action among the whole application. This property is read-only. | yii\base\Action

## Public Methods

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Method | Description | Defined By
--- | --- | ---
__call() | Calls the named method which is not a class method. | yii\base\Component
__clone() | This method is called after the object is created by cloning an existing one. | yii\base\Component
__construct() | Constructor. | yii\base\Action
__get() | Returns the value of a component property. | yii\base\Component
__isset() | Checks if a property is set, i.e. defined and not null. | yii\base\Component
__set() | Sets the value of a component property. | yii\base\Component
__unset() | Sets a component property to be null. | yii\base\Component
attachBehavior() | Attaches a behavior to this component. | yii\base\Component
attachBehaviors() | Attaches a list of behaviors to the component. | yii\base\Component
behaviors() | Returns a list of behaviors that this component should behave as. | yii\base\Component
canGetProperty() | Returns a value indicating whether a property can be read. | yii\base\Component
canSetProperty() | Returns a value indicating whether a property can be set. | yii\base\Component
className() | Returns the fully qualified name of this class. | yii\base\BaseObject
detachBehavior() | Detaches a behavior from the component. | yii\base\Component
detachBehaviors() | Detaches all behaviors from the component. | yii\base\Component
ensureBehaviors() | Makes sure that the behaviors declared in behaviors() are attached to this component. | yii\base\Component
findModel() | Returns the data model based on the primary key given. | yii\rest\Action
getBehavior() | Returns the named behavior object. | yii\base\Component
getBehaviors() | Returns all behaviors attached to this component. | yii\base\Component
getUniqueId() | Returns the unique ID of this action among the whole application. | yii\base\Action
hasEventHandlers() | Returns a value indicating whether there is any handler attached to the named event. | yii\base\Component
hasMethod() | Returns a value indicating whether a method is defined. | yii\base\Component
hasProperty() | Returns a value indicating whether a property is defined for this component. | yii\base\Component
init() | Initializes the object. | yii\rest\Action
off() | Detaches an existing event handler from this component. | yii\base\Component
on() | Attaches an event handler to an event. | yii\base\Component
runWithParams() | Runs this action with the specified parameters. | yii\base\Action
trigger() | Triggers an event. | yii\base\Component

## Protected Methods

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Method | Description | Defined By
--- | --- | ---
afterRun() | This method is called right after `run()` is executed. | yii\base\Action
beforeRun() | This method is called right before `run()` is executed. | yii\base\Action

## Property Details

$checkAccess public property

A PHP callable that will be called when running an action to determine if the current user has the permission to execute the action. If not set, the access check will not be performed. The signature of the callable should be as follows,

    function ($action, $model = null) {
        // $model is the requested model instance.
        // If null, it means no specific model (e.g. IndexAction)
    }

public callable $checkAccess = null
$findModel public property

A PHP callable that will be called to return the model corresponding to the specified primary key value. If not set, findModel() will be used instead. The signature of the callable should be:

    function ($id, $action) {
        // $id is the primary key value. If composite primary key, the key values
        // will be separated by comma.
        // $action is the action object currently running
    }

The callable should return the model found, or throw an exception if not found.

public callable $findModel = null
$modelClass public property

Class name of the model which will be handled by this action. The model class must implement yii\db\ActiveRecordInterface. This property must be set.

public string $modelClass = null

## Method Details

findModel() public method

Returns the data model based on the primary key given.

If the data model is not found, a 404 HTTP exception will be raised.

public yii\db\ActiveRecordInterface findModel ( $id )
$id | string | The ID of the model to be loaded. If the model has a composite primary key, the ID must be a string of the primary key values separated by commas. The order of the primary key values should follow that returned by the `primaryKey()` method of the model.
return | yii\db\ActiveRecordInterface | The model found
throws | yii\web\NotFoundHttpException | if the model cannot be found

init() public method

Initializes the object.

This method is invoked at the end of the constructor after the object is initialized with the given configuration.

public void init ( )