From a request | laravel-data | Spatie

 SPATIE

  Laravel Data
===============

spatie.be/open-source

  [Docs](https://spatie.be/docs)  [Laravel-data](https://spatie.be/docs/laravel-data/v2)  As-a-data-transfer-object  From a request

 Version   v4   v3   v2   v1

 Other versions for crawler [v4](https://spatie.be/docs/laravel-data/v4) [v3](https://spatie.be/docs/laravel-data/v3) [v2](https://spatie.be/docs/laravel-data/v2) [v1](https://spatie.be/docs/laravel-data/v1)

- [ Introduction ](https://spatie.be/docs/laravel-data/v2/introduction)
- [ Support us ](https://spatie.be/docs/laravel-data/v2/support-us)
- [ Requirements ](https://spatie.be/docs/laravel-data/v2/requirements)
- [ Installation & setup ](https://spatie.be/docs/laravel-data/v2/installation-setup)
- [ Questions and issues ](https://spatie.be/docs/laravel-data/v2/questions-issues)
- [ Changelog ](https://spatie.be/docs/laravel-data/v2/changelog)
- [ About us ](https://spatie.be/docs/laravel-data/v2/about-us)

Getting started
---------------

- [ Quickstart ](https://spatie.be/docs/laravel-data/v2/getting-started/quickstart)

As a DTO
--------

- [ Creating a data object ](https://spatie.be/docs/laravel-data/v2/as-a-data-transfer-object/creating-a-data-object)
- [ Optional properties ](https://spatie.be/docs/laravel-data/v2/as-a-data-transfer-object/optional-properties)
- [ Nesting ](https://spatie.be/docs/laravel-data/v2/as-a-data-transfer-object/nesting)
- [ Collections ](https://spatie.be/docs/laravel-data/v2/as-a-data-transfer-object/collections)
- [ Casts ](https://spatie.be/docs/laravel-data/v2/as-a-data-transfer-object/casts)
- [ From a request ](https://spatie.be/docs/laravel-data/v2/as-a-data-transfer-object/request-to-data-object)

As a resource
-------------

- [ From data to resource ](https://spatie.be/docs/laravel-data/v2/as-a-resource/from-data-to-resource)
- [ Including and excluding properties ](https://spatie.be/docs/laravel-data/v2/as-a-resource/lazy-properties)
- [ Wrapping ](https://spatie.be/docs/laravel-data/v2/as-a-resource/wrapping)
- [ Transforming data ](https://spatie.be/docs/laravel-data/v2/as-a-resource/transformers)

Advanced usage
--------------

- [ Eloquent casting ](https://spatie.be/docs/laravel-data/v2/advanced-usage/eloquent-casting)
- [ Transforming to TypeScript ](https://spatie.be/docs/laravel-data/v2/advanced-usage/typescript)
- [ Working with dates ](https://spatie.be/docs/laravel-data/v2/advanced-usage/working-with-dates)
- [ Normalizers ](https://spatie.be/docs/laravel-data/v2/advanced-usage/normalizers)
- [ Pipeline ](https://spatie.be/docs/laravel-data/v2/advanced-usage/pipeline)
- [ Use with Inertia ](https://spatie.be/docs/laravel-data/v2/advanced-usage/use-with-inertia)
- [ Use with Livewire ](https://spatie.be/docs/laravel-data/v2/advanced-usage/use-with-livewire)
- [ Creating a cast ](https://spatie.be/docs/laravel-data/v2/advanced-usage/creating-a-cast)
- [ Creating a transformer ](https://spatie.be/docs/laravel-data/v2/advanced-usage/creating-a-transformer)
- [ Creating a rule inferrer ](https://spatie.be/docs/laravel-data/v2/advanced-usage/creating-a-rule-inferrer)
- [ Internal structures ](https://spatie.be/docs/laravel-data/v2/advanced-usage/internal-structures)
- [ Validation attributes ](https://spatie.be/docs/laravel-data/v2/advanced-usage/validation-attributes)

      You are viewing the documentation for **an older version** of this package. You can check the version you are using with the following command:

 `                                    composer show spatie/laravel-data                                                                                                                                                                                                                                    `

From a request
==============

###  On this page

1. [ Using validation ](#content-using-validation)
2. [ Mapping a request onto a data object ](#content-mapping-a-request-onto-a-data-object)
3. [ Authorizing a request ](#content-authorizing-a-request)
4. [ Validating a collection of data objects: ](#content-validating-a-collection-of-data-objects)
5. [ Validating a data object without request ](#content-validating-a-data-object-without-request)
6. [ Retrieving validation rules for a data object ](#content-retrieving-validation-rules-for-a-data-object)
7. [ Validation and nesting or collecting the same class ](#content-validation-and-nesting-or-collecting-the-same-class)

You can create a data object by the values given in the request.

For example, let's say you send a POST request to an endpoint with the following data:

```
{
    "title" : "Never gonna give you up",
    "artist" : "Rick Astley"
}
```

This package can automatically resolve a `SongData` object from these values by using the `SongData` class we saw in an earlier chapter:

```
class SongData extends Data
{
    public function __construct(
        public string $title,
        public string $artist,
    ) {
    }
}
```

You can now inject the `SongData` class in your controller. It will already be filled with the values found in the request.

```
class SongController{
    ...

    public function update(
        Song $model,
        SongData $data
    ){
        $model->update($data->all());

        return redirect()->back();
    }
}
```

Using validation
--------------------------------------------------------------------------------------------------------

When creating a data object from a request, the package can also validate the values from the request that will be used to construct the data object.

It is possible to add rules as attributes to properties of a data object:

```
class SongData extends Data
{
    public function __construct(
        public string $title,
        #[Max(20)]
        public string $artist,
    ) {
    }
}
```

When you provide an artist with a length of more than 20 characters, the validation will fail just like it would when you created a custom request class for the endpoint.

You can find a complete list of available rules [here](/docs/laravel-data/v2/advanced-usage/validation-attributes).

One special attribute is the `Rule` attribute. With it, you can write rules just like you would when creating a custom Laravel request:

```
// using an array
#[Rule(['required', 'string'])]
public string $property

// using a string
#[Rule('required|string')]
public string $property

// using multiple arguments
#[Rule('required', 'string')]
public string $property
```

It is also possible to write rules down in a dedicated method on the data object. This can come in handy when you want to construct a custom rule object which isn't possible with attributes:

```
class SongData extends Data
{
    public function __construct(
        public string $title,
        public string $artist,
    ) {
    }

    public static function rules(): array
    {
        return [
            'title' => ['required', 'string'],
            'artist' => ['required', 'string'],
        ];
    }
}
```

It is even possible to use the validationAttribute objects within the `rules` method:

```
class SongData extends Data
{
    public function __construct(
        public string $title,
        public string $artist,
    ) {
    }

    public static function rules(): array
    {
        return [
            'title' => [new Required(), new StringType()],
            'artist' => [new Required(), new StringType()],
        ];
    }
}
```

Rules defined within the `rules` method will always overwrite automatically generated rules.

You can even add dependencies to be automatically injected:

```
use SongSettingsRepository;

class SongData extends Data
{
    public function __construct(
        public string $title,
        public string $artist,
    ) {
    }

    public static function rules(SongSettingsRepository $settings): array
    {
        return [
            'title' => [new RequiredIf($settings->forUser(auth()->user())->title_required), new StringType()],
            'artist' => [new Required(), new StringType()],
        ];
    }
}
```

Additionally, if you need to access the data payload, you can use `$payload` parameter:

```
class SongData extends Data
{
    public function __construct(
        public string $title,
        public string $artist,
    ) {
    }

    public static function rules(array $payload): array
    {
        return [
            'title' => ['required'],
            'artist' => Rule::requiredIf($payload['title'] !== 'Never Gonna Give You Up'),
        ];
    }
}
```

By default, the provided payload is the whole request payload provided to the data object. If you want to generate rules in nested data objects then a relative payload can be more useful. You can inject such payload as follows:

```
class AlbumData extends Data
{
    public function __construct(
        public string $title,
        #[DataCollectionOf(SongData::class)]
        public DataCollection $songs,
    ) {
    }
}

class SongData extends Data
{
    public function __construct(
        public string $title,
        public ?string $artist,
    ) {
    }

    public static function rules(array $relativePayload): array
    {
        return [
            'title' => ['required'],
            'artist' => Rule::requiredIf($relativePayload['title'] !== 'Never Gonna Give You Up'),
        ];
    }
}
```

When providing such payload:

```
[
    'title' => 'Best songs ever made',
    'songs' => [
        ['title' => 'Never Gonna Give You Up'],
        ['title' => 'Heroes', 'artist' => 'David Bowie'],
    ],
];
```

The rules will be:

```
[
    'title' => ['string', 'required'],
    'songs' => ['present', 'array'],
    'songs.*.title' => ['string', 'required'],
    'songs.*.artist' => ['string', 'nullable'],
    'songs.*' => [NestedRules(...)],
]
```

Make sure the name of the parameter is `$relativePayload` in the `rules` method, otherwise no payload will be injected.

As you can see we're using the `NestedRules` [rule](https://laravel.com/docs/9.x/validation#accessing-nested-array-data) recently introduced with Laravel. This feature will not work if you're not using Laravel 9!

Mapping a request onto a data object
--------------------------------------------------------------------------------------------------------------------------------------------------------------------

By default, the package will do a one to one mapping from request to the data object, which means that for each property within the data object, a value with the same key will be searched within the request values.

If you want to customize this mapping, then you can always add a magical creation method like this:

```
class SongData extends Data
{
    public function __construct(
        public string $title,
        public string $artist,
    ) {
    }

    public static function fromRequest(Request $request): static
    {
        return new self(
            $request->input('title_of_song'),
            $request->input('artist_name')
        );
    }
}
```

### Getting the data object filled with request data from anywhere

You can resolve a data object from the container.

```
app(SongData::class);
```

We resolve a data object from the container, it's properties will allready be filled by the values of the request with matching key names. If the request contains data that is not compatible with the data object, a validation exception will be thrown.

### Automatically inferring rules for properties

Since we have such strongly typed data objects, we can infer some validation rules from them. Rule inferrers will take information about the type of the property and will create validation rules from that information.

Rule inferrers are configured in the `data.php` config file:

```
/*
 * Rule inferrers can be configured here. They will automatically add
 * validation rules to properties of a data object based upon
 * the type of the property.
 */
'rule_inferrers' => [
    Spatie\LaravelData\RuleInferrers\SometimesRuleInferrer::class,
    Spatie\LaravelData\RuleInferrers\BuiltInTypesRuleInferrer::class,
    Spatie\LaravelData\RuleInferrers\AttributesRuleInferrer::class,
    Spatie\LaravelData\RuleInferrers\NullableRuleInferrer::class,
    Spatie\LaravelData\RuleInferrers\RequiredRuleInferrer::class,
],
```

By default, four rule inferrers are enabled:

- **SometimesRuleInferrer** will add a `sometimes` rule when the property is optional
- **NullableRuleInferrer** will add a `nullable` rule when the property is nullable
- **RequiredRuleInferrer** will add a `required` rule when the property is not nullable
- **BuiltInTypesRuleInferrer** will add a rules which are based upon the built-in php types:
    - An `int` or `float` type will add the `numeric` rule
    - A `bool` type will add the `boolean` rule
    - A `string` type will add the `string` rule
    - A `array` type will add the `array` rule
- **AttributesRuleInferrer** will make sure that rule attributes we described above will also add their rules

It is possible to write your rule inferrers. You can find more information [here](/docs/laravel-data/v2/advanced-usage/creating-a-rule-inferrer).

### Skipping validation

Sometimes you don't want properties to be automatically validated, for instance when you're manually overwriting the rules method like this:

```
class SongData extends Data
{
    public function __construct(
        public string $name,
    ) {
    }

    public static function fromRequest(Request $request): static{
        return new self("{$request->input('first_name')} {$request->input('last_name')}")
    }

    public static function rules(): array
    {
        return [
            'first_name' => ['required', 'string'],
            'last_name' => ['required', 'string'],
        ];
    }
}
```

When a request is being validated, the rules will look like this:

```
[
    'name' => ['required', 'string'],
    'first_name' => ['required', 'string'],
    'last_name' => ['required', 'string'],
]
```

We know we never want to validate the `name` property since it won't be in the request payload, this can be done as such:

```
class SongData extends Data
{
    public function __construct(
        #[WithoutValidation]
        public string $name,
    ) {
    }
}
```

Now the validation rules will look like this:

```
[
    'first_name' => ['required', 'string'],
    'last_name' => ['required', 'string'],
]
```

### Overwriting the validator

Before validating the values, it is possible to plugin into the validator. This can be done as such:

```
class SongData extends Data
{
    public function __construct(
        public string $title,
        public string $artist,
    ) {
    }

    public static function withValidator(Validator $validator): void
    {
        $validator->after(function ($validator) {
            $validator->errors()->add('field', 'Something is wrong with this field!');
        });
    }
}
```

### Overwriting messages

It is possible to overwrite the error messages that will be returned when an error fails:

```
class SongData extends Data
{
    public function __construct(
        public string $title,
        public string $artist,
    ) {
    }

    public static function messages(): array
    {
        return [
            'title.required' => 'A title is required',
            'artist.required' => 'An artist is required',
        ];
    }
}
```

### Overwriting attributes

In the default Laravel validation rules, you can overwrite the name of the attribute as such:

```
class SongData extends Data
{
    public function __construct(
        public string $title,
        public string $artist,
    ) {
    }

    public static function attributes(): array
    {
        return [
            'title' => 'titel',
            'artist' => 'artiest',
        ];
    }
}
```

### Overwriting other validation functionality

Next to overwriting the validator, attributes and messages it is also possible to overwrite the following functionality.

The redirect when a validation failed:

```
class SongData extends Data
{
    // ...

    public static function redirect(): string
    {
        return action(HomeController::class);
    }
}
```

Or the route which will be used to redirect after a validation failed:

```
class SongData extends Data
{
    // ...

    public static function redirectRoute(): string
    {
        return 'home';
    }
}
```

Whether to stop validating on the first failure:

```
class SongData extends Data
{
    // ...

    public static function stopOnFirstFailure(): bool
    {
        return true;
    }
}
```

The name of the error bag:

```
class SongData extends Data
{
    // ...

    public static function errorBag(): string
    {
        return 'never_gonna_give_an_error_up';
    }
}
```

### Using dependencies in overwritten functionality

You can also provide dependencies to be injected in the overwritten validator functionality methods like `messages`, `attributes`, `redirect`, `redirectRoute`, `stopOnFirstFailure`, `errorBag`:

```
class SongData extends Data
{
    public function __construct(
        public string $title,
        public string $artist,
    ) {
    }

    public static function attributes(
        ValidationAttributesLanguageRepository $validationAttributesLanguageRepository
    ): array
    {
        return [
            'title' => $validationAttributesLanguageRepository->get('title'),
            'artist' => $validationAttributesLanguageRepository->get('artist'),
        ];
    }
}
```

Authorizing a request
-----------------------------------------------------------------------------------------------------------------------

Just like with Laravel requests, it is possible to authorize an action for certain people only:

```
class SongData extends Data
{
    public function __construct(
        public string $title,
        public string $artist,
    ) {
    }

    public static function authorize(): bool
    {
        return Auth::user()->name === 'Ruben';
    }
}
```

If the method returns `false`, then an `AuthorizationException` is thrown.

Validating a collection of data objects:
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Let's say we want to create a data object like this from a request:

```
class AlbumData extends Data
{
    public function __construct(
        public string $title,
        #[DataCollectionOf(SongData::class)]
        public DataCollection $songs,
    ) {
    }
}
```

Since the `SongData` has its own validation rules, the package will automatically apply them when resolving validation rules for this object.

In this case the validation rules for `AlbumData` would look like this:

```
[
    'title' => ['required', 'string'],
    'songs' => ['required', 'array'],
    'songs.*.title' => ['required', 'string'],
    'songs.*.artist' => ['required', 'string'],
]
```

Validating a data object without request
--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

It is also possible to validate values for a data object without using a request:

```
SongData::validate(['title' => 'Never gonna give you up', 'artist' => 'Rick Astley']);
```

This will either throw a `ValidationException` or return a validated version of the payload.

It is possible to return a data object when the payload is valid when calling:

```
SongData::validateAndCreate(['title' => 'Never gonna give you up', 'artist' => 'Rick Astley']);
```

Retrieving validation rules for a data object
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

You can retrieve the validation rules a data object will generate as such:

```
AlbumData::getValidationRules();
```

This will produce the following array with rules:

```
[
    'title' => ['required', 'string'],
    'songs' => ['required', 'array'],
    'songs.*.title' => ['required', 'string'],
    'songs.*.artist' => ['required', 'string'],
]
```

You can also select specific fields as such:

```
AlbumData::getValidationRules(['title']);
```

Which will provide you the following rules:

```
[
    'title' => ['required', 'string'],
]
```

When you're having rules depending on a specific payload, you can provide the payload:

```
AlbumData::getValidationRules(payload: $payload);
```

Validation and nesting or collecting the same class
-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Be aware that it is impossible to nest or collect the same class and then create validation rules. The following examples will cause an infinite loop because the rules will be generated each time again and again until your memory runs dry:

```
class Genre extends Data {
  public function __construct(
    public int $id,
    public string $name,
    public ?Genre $sub_genre
  ) {}
}
```

```
class Genre extends Data {
  public function __construct(
    public int $id,
    public string $name,
    #[DataCollectionOf(Genre::class)]
    public DataCollection $sub_genre
  ) {}
}
```

You can still use this package with these kinds of data objects. Magic creation methods, transforming, and all other functionalities of this package will still work.

But using this data object to generate validation rules is impossible. Notice that the package also generates validation rules when injecting a data object in a controller. The best solution in such a case is manually defining validation rules and using a magical creation method to create the data objects like this:

```
Genre::from(request()->all());
```