# Class yii\base\DynamicModel

Inheritance | yii\base\DynamicModel » yii\base\Model » yii\base\Component » yii\base\BaseObject
Implements | ArrayAccess, IteratorAggregate, yii\base\Arrayable, yii\base\Configurable, yii\base\StaticInstanceInterface
Uses Traits | yii\base\ArrayableTrait, yii\base\StaticInstanceTrait
Available since version | 2.0
Source Code | https://github.com/yiisoft/yii2/blob/master/framework/base/DynamicModel.php

DynamicModel is a model class primarily used to support ad hoc data validation.

The typical usage of DynamicModel is as follows,

    public function actionSearch($name, $email)
    {
        $model = DynamicModel::validateData(compact('name', 'email'), [
            [['name', 'email'], 'string', 'max' => 128],
            ['email', 'email'],
        ]);
        if ($model->hasErrors()) {
            // validation fails
        } else {
            // validation succeeds
        }
    }

The above example shows how to validate `$name` and `$email` with the help of DynamicModel. The validateData() method creates an instance of DynamicModel, defines the attributes using the given data (`name` and `email` in this example), and then calls yii\base\Model::validate().

You can check the validation result by hasErrors(), like you do with a normal model. You may also access the dynamic attributes defined through the model instance, e.g., `$model->name` and `$model->email`.

Alternatively, you may use the following more "classic" syntax to perform ad-hoc data validation:

    $model = new DynamicModel(compact('name', 'email'));
    $model->addRule(['name', 'email'], 'string', ['max' => 128])
        ->addRule('email', 'email')
        ->validate();

DynamicModel implements the above ad-hoc data validation feature by supporting the so-called "dynamic attributes". It basically allows an attribute to be defined dynamically through its constructor or defineAttribute().

## Public Properties

Hide inherited properties

Property | Type | Description | Defined By
--- | --- | --- | ---
$activeValidators | yii\validators\Validator[] | The validators applicable to the current $scenario. This property is read-only. | yii\base\Model
$attributes | array | Attribute values (name => value). | yii\base\Model
$behaviors | yii\base\Behavior[] | List of behaviors attached to this component. This property is read-only. | yii\base\Component
$errors | array | An array of errors for all attributes. Empty array is returned if no error. The result is a two-dimensional array. See getErrors() for detailed description. This property is read-only. | yii\base\Model
$firstErrors | array | The first errors. The array keys are the attribute names, and the array values are the corresponding error messages. An empty array will be returned if there is no error. This property is read-only. | yii\base\Model
$iterator | ArrayIterator | An iterator for traversing the items in the list. This property is read-only. | yii\base\Model
$scenario | string | The scenario that this model is in. Defaults to SCENARIO_DEFAULT. | yii\base\Model
$validators | ArrayObject|yii\validators\Validator[] | All the validators declared in the model. This property is read-only. | yii\base\Model

## Public Methods

Hide inherited methods

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() | Constructors. | yii\base\DynamicModel
__get() | Returns the value of a component property. | yii\base\DynamicModel
__isset() | Checks if a property is set, i.e. defined and not null. | yii\base\DynamicModel
__set() | Sets the value of a component property. | yii\base\DynamicModel
__unset() | Sets a component property to be null. | yii\base\DynamicModel
activeAttributes() | Returns the attribute names that are subject to validation in the current scenario. | yii\base\Model
addError() | Adds a new error to the specified attribute. | yii\base\Model
addErrors() | Adds a list of errors. | yii\base\Model
addRule() | Adds a validation rule to this model. | yii\base\DynamicModel
afterValidate() | This method is invoked after validation ends. | yii\base\Model
attachBehavior() | Attaches a behavior to this component. | yii\base\Component
attachBehaviors() | Attaches a list of behaviors to the component. | yii\base\Component
attributeHints() | Returns the attribute hints. | yii\base\Model
attributeLabels() | {@inheritDoc} | yii\base\DynamicModel
attributes() | Returns the list of attribute names. | yii\base\DynamicModel
beforeValidate() | This method is invoked before validation starts. | yii\base\Model
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\DynamicModel
canSetProperty() | Returns a value indicating whether a property can be set. | yii\base\DynamicModel
className() | Returns the fully qualified name of this class. | yii\base\BaseObject
clearErrors() | Removes errors for all attributes or a single attribute. | yii\base\Model
createValidators() | Creates validator objects based on the validation rules specified in rules(). | yii\base\Model
defineAttribute() | Defines an attribute. | yii\base\DynamicModel
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
extraFields() | Returns the list of fields that can be expanded further and returned by toArray(). | yii\base\ArrayableTrait
fields() | Returns the list of fields that should be returned by default by toArray() when no specific fields are specified. | yii\base\ArrayableTrait
formName() | Returns the form name that this model class should use. | yii\base\Model
generateAttributeLabel() | Generates a user friendly attribute label based on the give attribute name. | yii\base\Model
getActiveValidators() | Returns the validators applicable to the current $scenario. | yii\base\Model
getAttributeHint() | Returns the text hint for the specified attribute. | yii\base\Model
getAttributeLabel() | Returns the text label for the specified attribute. | yii\base\Model
getAttributes() | Returns attribute values. | yii\base\Model
getBehavior() | Returns the named behavior object. | yii\base\Component
getBehaviors() | Returns all behaviors attached to this component. | yii\base\Component
getErrorSummary() | Returns the errors for all attributes as a one-dimensional array. | yii\base\Model
getErrors() | Returns the errors for all attributes or a single attribute. | yii\base\Model
getFirstError() | Returns the first error of the specified attribute. | yii\base\Model
getFirstErrors() | Returns the first error of every attribute in the model. | yii\base\Model
getIterator() | Returns an iterator for traversing the attributes in the model. | yii\base\Model
getScenario() | Returns the scenario that this model is used in. | yii\base\Model
getValidators() | Returns all the validators declared in rules(). | yii\base\Model
hasAttribute() | Returns a value indicating whether the model has an attribute with the specified name. | yii\base\DynamicModel
hasErrors() | Returns a value indicating whether there is any validation error. | yii\base\Model
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\base\BaseObject
instance() | Returns static class instance, which can be used to obtain meta information. | yii\base\StaticInstanceTrait
isAttributeActive() | Returns a value indicating whether the attribute is active in the current scenario. | yii\base\Model
isAttributeRequired() | Returns a value indicating whether the attribute is required. | yii\base\Model
isAttributeSafe() | Returns a value indicating whether the attribute is safe for massive assignments. | yii\base\Model
load() | Populates the model with input data. | yii\base\Model
loadMultiple() | Populates a set of models with the data from end user. | yii\base\Model
off() | Detaches an existing event handler from this component. | yii\base\Component
offsetExists() | Returns whether there is an element at the specified offset. | yii\base\Model
offsetGet() | Returns the element at the specified offset. | yii\base\Model
offsetSet() | Sets the element at the specified offset. | yii\base\Model
offsetUnset() | Sets the element value at the specified offset to null. | yii\base\Model
on() | Attaches an event handler to an event. | yii\base\Component
onUnsafeAttribute() | This method is invoked when an unsafe attribute is being massively assigned. | yii\base\Model
rules() | Returns the validation rules for attributes. | yii\base\Model
safeAttributes() | Returns the attribute names that are safe to be massively assigned in the current scenario. | yii\base\Model
scenarios() | Returns a list of scenarios and the corresponding active attributes. | yii\base\Model
setAttributeLabel() | Sets a label for an attribute. | yii\base\DynamicModel
setAttributeLabels() | Sets the attribute labels in a massive way. | yii\base\DynamicModel
setAttributes() | Sets the attribute values in a massive way. | yii\base\Model
setScenario() | Sets the scenario for the model. | yii\base\Model
toArray() | Converts the model into an array. | yii\base\ArrayableTrait
trigger() | Triggers an event. | yii\base\Component
undefineAttribute() | Undefines an attribute. | yii\base\DynamicModel
validate() | Performs the data validation. | yii\base\Model
validateData() | Validates the given data with the specified validation rules. | yii\base\DynamicModel
validateMultiple() | Validates multiple models. | yii\base\Model

## Protected Methods

Hide inherited methods

Method | Description | Defined By
--- | --- | ---
extractFieldsFor() | Extract nested fields from a fields collection for a given root field Nested fields are separated with dots (.). e.g: "item.id" The previous example would extract "id". | yii\base\ArrayableTrait
extractRootFields() | Extracts the root field names from nested fields. | yii\base\ArrayableTrait
resolveFields() | Determines which fields can be returned by toArray(). | yii\base\ArrayableTrait

## Events

Hide inherited events

Event | Type | Description | Defined By
--- | --- | --- | ---
EVENT_AFTER_VALIDATE | yii\base\Event | An event raised at the end of validate() | yii\base\Model
EVENT_BEFORE_VALIDATE | yii\base\ModelEvent | An event raised at the beginning of validate(). | yii\base\Model

## Constants

Hide inherited constants

Constant | Value | Description | Defined By
--- | --- | --- | ---
SCENARIO_DEFAULT | 'default' | The name of the default scenario. | yii\base\Model

## Method Details

__construct() public method

Constructors.

public void __construct ( array $attributes = [], $config = [] )
$attributes | array | The dynamic attributes (name-value pairs, or names) being defined
$config | array | The configuration array to be applied to this object.

__get() public method

Returns the value of a component property.

This method will check in the following order and act accordingly:

- a property defined by a getter: return the getter result
- a property of a behavior: return the behavior property value

Do not call this method directly as it is a PHP magic method that will be implicitly called when executing `$value = $component->property;`.

public mixed __get ( $name )
$name | string | The property name
return | mixed | The property value or the value of a behavior's property
throws | yii\base\UnknownPropertyException | if the property is not defined
throws | yii\base\InvalidCallException | if the property is write-only.

__isset() public method

Checks if a property is set, i.e. defined and not null.

This method will check in the following order and act accordingly:

- a property defined by a setter: return whether the property is set
- a property of a behavior: return whether the property is set
- return `false` for non existing properties

Do not call this method directly as it is a PHP magic method that will be implicitly called when executing `isset($component->property)`.

public boolean __isset ( $name )
$name | string | The property name or the event name
return | boolean | Whether the named property is set

__set() public method

Sets the value of a component property.

This method will check in the following order and act accordingly:

- a property defined by a setter: set the property value
- an event in the format of "on xyz": attach the handler to the event "xyz"
- a behavior in the format of "as xyz": attach the behavior named as "xyz"
- a property of a behavior: set the behavior property value

Do not call this method directly as it is a PHP magic method that will be implicitly called when executing `$component->property = $value;`.

public void __set ( $name, $value )
$name | string | The property name or the event name
$value | mixed | The property value
throws | yii\base\UnknownPropertyException | if the property is not defined
throws | yii\base\InvalidCallException | if the property is read-only.

__unset() public method

Sets a component property to be null.

This method will check in the following order and act accordingly:

- a property defined by a setter: set the property value to be null
- a property of a behavior: set the property value to be null

Do not call this method directly as it is a PHP magic method that will be implicitly called when executing `unset($component->property)`.

public void __unset ( $name )
$name | string | The property name
throws | yii\base\InvalidCallException | if the property is read only.

addRule() public method

Adds a validation rule to this model.

You can also directly manipulate $validators to add or remove validation rules. This method provides a shortcut.

public $this addRule ( $attributes, $validator, $options = [] )
$attributes | string|array | The attribute(s) to be validated by the rule
$validator | string|yii\validators\Validator|Closure | The validator. This can be either: a built-in validator name listed in builtInValidators; a method name of the model class; an anonymous function; a validator class name. a Validator.
$options | array | The options (name-value pairs) to be applied to the validator
return | $this | The model itself

attributeLabels() public method

{@inheritDoc}

public void attributeLabels ( )

attributes() public method

Returns the list of attribute names.

By default, this method returns all public non-static properties of the class. You may override this method to change the default behavior.

public array attributes ( )
return | array | List of attribute names.

canGetProperty() public method

Returns a value indicating whether a property can be read.

A property can be read if:

- the class has a getter method associated with the specified name (in this case, property name is case-insensitive);
- the class has a member variable with the specified name (when `$checkVars` is true);
- an attached behavior has a readable property of the given name (when `$checkBehaviors` is true).

public boolean canGetProperty ( $name, $checkVars = true, $checkBehaviors = true )
$name | string | The property name
$checkVars | boolean | Whether to treat member variables as properties
$checkBehaviors | boolean | Whether to treat behaviors' properties as properties of this component
return | boolean | Whether the property can be read

canSetProperty() public method

Returns a value indicating whether a property can be set.

A property can be written if:

- the class has a setter method associated with the specified name (in this case, property name is case-insensitive);
- the class has a member variable with the specified name (when `$checkVars` is true);
- an attached behavior has a writable property of the given name (when `$checkBehaviors` is true).

public boolean canSetProperty ( $name, $checkVars = true, $checkBehaviors = true )
$name | string | The property name
$checkVars | boolean | Whether to treat member variables as properties
$checkBehaviors | boolean | Whether to treat behaviors' properties as properties of this component
return | boolean | Whether the property can be written

defineAttribute() public method

Defines an attribute.

public void defineAttribute ( $name, $value = null )
$name | string | The attribute name
$value | mixed | The attribute value

hasAttribute() public method (available since version 2.0.16)

Returns a value indicating whether the model has an attribute with the specified name.

public boolean hasAttribute ( $name )
$name | string | The name of the attribute
return | boolean | Whether the model has an attribute with the specified name.

setAttributeLabel() public method (available since version 2.0.35)

Sets a label for an attribute.

See also:

- attributeLabels()
- $_attributeLabels

public $this setAttributeLabel ( $attribute, $label )
$attribute | string | Attribute name
$label | string | Attribute label value

setAttributeLabels() public method (available since version 2.0.35)

Sets the attribute labels in a massive way.

See also:

- attributeLabels()
- $_attributeLabels

public $this setAttributeLabels ( array $labels = [] )
$labels | array | Array of attribute labels

undefineAttribute() public method

Undefines an attribute.

public void undefineAttribute ( $name )
$name | string | The attribute name

validateData() public static method

Validates the given data with the specified validation rules.

This method will create a DynamicModel instance, populate it with the data to be validated, create the specified validation rules, and then validate the data using these rules.

public static static validateData ( array $data, $rules = [] )
$data | array | The data (name-value pairs) to be validated
$rules | array | The validation rules. Please refer to yii\base\Model::rules() on the format of this parameter.
return | static | The model instance that contains the data being validated
throws | yii\base\InvalidConfigException | if a validation rule is not specified correctly.