README

Data providers encapsulate logic for Inertia views, keep your controllers clean and simple.

Installation

Install this package via composer:

composer require webfox/laravel-inertia-dataproviders

We assume you've already for the Inertia adapter for Laravel installed.

What Problem Does This Package Solve?

Controllers in Laravel are meant to be slim. We have Form Requests to extract our the validation & authorization logic and our display logic is in our views, so why do we still insist on making our controllers handle fetching the data for those views?

This is especially evident in Inertia applications due to the introduction of concepts like lazy props.

Data providers extract the data composition for your Inertia views into their own classes. Inertia data providers may prove particularly useful if multiple routes or controllers within your application always needs a particular piece of data.

No more 40 line controller methods for fetching data!

Usage

Using a Data Provider

Data providers take advantage of the fact that Inertia::render can accept an Arrayable. They can also be used as discrete attributes in the data array.

use App\Models\Demo;
use App\DataProviders\DemoDataProvider;

class DemoController extends Controller
{
    public function show(Demo $demo)
    {
        return Inertia::render('DemoPage', new DemoDataProvider($demo));
    }
    
    public function edit(Demo $demo)
    {
        return Inertia::render('DemoPage', [
          'some' => 'data',
          'more' => 'data',
          'demo' => new DemoDataProvider($demo),
        ]);
    }
}

What Does a Data Provider Look Like?

Data providers can live anywhere, but we'll use App/Http/DataProviders for this example.

The simplest data provider is just a class that extends DataProvider, any public methods or properties will be available to the page as data.
A fully featured data provider might look like this:

<?php
declare(strict_types=1);

namespace App\Http\DataProviders;

use Inertia\LazyProp;
use App\Services\InjectedDependency;
use Webfox\InertiaDataProviders\DataProvider;

class DemoDataProvider extends DataProvider
{

    public function __construct(
        /*
         * All public properties are automatically available in the page
         * This would be available to the page as `demo`
         */
        public Demo $demo;
    )
    {
        /*
         * Data providers have a `staticData` property, which you can use to add any data that doesn't warrant a full
         * property or separate method
         */
        $this->staticData = [
            /*
             * This will be available to the page as `title`
             */
            'title' => $this->calculateTitle($demo),
        ];
    }
    
    /*
     * All public methods are automatically evaluated as data and provided to the page.
     * ALWAYS included on first visit, OPTIONALLY included on partial reloads, ALWAYS evaluated
     * This would be available to the page as `someData`.
     * Additionally these methods are resolved through Laravel's service container, so any parameters will be automatically resolved.
     */
    public function someData(InjectedDependency $example): array
    {
        return [
            'some' => $example->doThingWith('some'),
            'more' => 'data',
        ];
    }
    
    /*
     * If a method returns a `Closure` it will be evaluated as a lazy property.
     * ALWAYS included on first visit, OPTIONALLY included on partial reloads, ONLY evaluated when needed
     * Additionally the callback methods are resolved through Laravel's service container, so any parameters will be automatically resolved.
     * @see https://inertiajs.com/partial-reloads#lazy-data-evaluation
     */
    public function quickLazyExample(): Closure
    {
        return function(InjectedDependency $example): string {
            return $example->formatName($this->demo->user->name);
        };
    }
    
    /*
     * If a method is typed to return a LazyProp, it will only be evaluated when requested following inertia's rules for lazy data evaluation
     * NEVER included on first visit, OPTIONALLY included on partial reloads, ONLY evaluated when needed
     * Additionally the lazy callback methods are resolved through Laravel's service container, so any parameters will be automatically resolved.
     * @see https://inertiajs.com/partial-reloads#lazy-data-evaluation
     */
    public function lazyExample(): LazyProp
    {
        return Inertia::lazy(
            fn (InjectedDependency $example) => $example->aHeavyCalculation($this->demo)
        );
    }
    
    /*
     * `protected` and `private` methods are not available to the page
     */
    protected function calculateTitle(Demo $demo): string
    {
        return $demo->name . ' Demo';
    }

}

Using Multiple Data Providers

Sometimes you might find yourself wanting to return multiple DataProviders DataProvider::collection is the method for you. Each DataProvider in the collection will be evaluated and merged into the page's data, later values from DataProviders will override earlier DataProviders.

use App\Models\Demo;
use App\DataProviders\TabDataProvider;
use App\DataProviders\DemoDataProvider;

class DemoController extends Controller
{
    public function show(Demo $demo)
    {
        return Inertia::render('DemoPage', DataProvider::collection(
            new TabDataProvider(current: 'demo'),
            new DemoDataProvider($demo),
        ));
    }
}

You can also conditionally include DataProviders in the collection:

use App\Models\Demo;
use App\DataProviders\TabDataProvider;
use App\DataProviders\DemoDataProvider;
use App\DataProviders\EditDemoDataProvider;
use App\DataProviders\CreateVenueDataProvider;

class DemoController extends Controller
{
    public function show(Demo $demo)
    {
        return Inertia::render('DemoPage', DataProvider::collection(
            new TabDataProvider(current: 'demo'),
            new DemoDataProvider($demo),
        )->when($demo->has_venue, function (DataProviderCollection $collection) use($demo) {
            $collection->push(new CreateVenueDataProvider($demo));
        })
        ->unless($demo->locked, function (DataProviderCollection $collection) use($demo) {
            $collection->push(new EditDemoDataProvider($demo));
        }));
    }
}

Or you can use the DataProviderCollection::add method to add a DataProvider to the collection later:

use App\Models\Demo;
use App\DataProviders\TabDataProvider;
use App\DataProviders\DemoDataProvider;
use App\DataProviders\CreateVenueDataProvider;

class DemoController extends Controller
{
    public function show(Demo $demo)
    {
        $pageData = DataProvider::collection(
            new TabDataProvider(current: 'demo'),
            new DemoDataProvider($demo),
        );
        
        if($demo->has_venue) {
            $pageData->add(new CreateVenueDataProvider($demo));
        }

        return Inertia::render('DemoPage', $pageData);
    }
}

If you need to return the entire dataset as an array, for instance for use in JSON responses, you can use `toNestedArray()

use App\Models\Demo;
use Illuminate\Http\Request;
use App\DataProviders\TabDataProvider;
use App\DataProviders\DemoDataProvider;
use App\DataProviders\CreateVenueDataProvider;

class DemoController extends Controller
{
    public function show(Request $request, Demo $demo)
    {
        return (new DemoDataProvider($demo))->toNestedArray();
    }
}

Changelog

Please see CHANGELOG for more information on what has changed recently.

Contributing

We welcome all contributors to the project.

License

The MIT License (MIT). Please see License File for more information.

webfox / laravel-inertia-dataproviders

Maintainers

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