Laravel Livewire error when I add a constructor to call a service class

Question

I've got a piece of code I want to reuse. I've read this Laravel cleaner code article and this other Laravel Services Pattern article, where I have realized I can reuse code in several places of the application by using services classes.

In this case, I created a new MyService class, inside a new folder app/Services/MyService.

namespace App\Services;

class MyService
{
    public function reuse_code($param){
       return void;
    }
}

The problem comes when I want to call the class through the constructor inside a Livewire class component, as follows:

<?php

namespace App\Http\Livewire;

use App\Services\MyService;
use Livewire\Component;
use Livewire\WithPagination;

class LivewireTable extends Component
{
    use WithPagination;

    private $myClassService;

    public function __construct(MyService $myService)
    {
        $this->myClassService = $myService;
    }

    public function render()
    {
       $foo = $this->myClassService->reuse_code($param);
       return view('my.view',compact('foo'));
    }
}

The error displayed is the following:

Argument 1 passed to App\Http\Livewire\LivewireTable::__construct() must be an instance of App\Services\MyService, string given

(However, If I use a trait, there are no problems. But I am afraid then my traits collide as previous experiences)

How do I fix it? What am I missing?

how are you calling the Livewire class? Have you tried using mount() instead of __construct()? — IGP
– IGP, Commented Jan 26, 2021 at 19:54
Indeed, in the docs it says so! That did the trick. Thx a lot! — Pathros
– Pathros, Commented Jan 26, 2021 at 20:24

Pathros · Accepted Answer · 2022-06-27 19:11:10Z

10

Solved Just like @IGP said, reading in the livewire docs it says:

In Livewire components, you use mount() instead of a class constructor __construct() like you may be used to.

So, my working code is as follows:

    <?php
    
    namespace App\Http\Livewire;
    
    use App\Services\MyService;
    use Livewire\Component;
    use Livewire\WithPagination;
    
    class LivewireTable extends Component
    {
        use WithPagination;
    
        private $myClassService;
    
        public function mount(MyService $myService)
        {
            $this->myClassService = $myService;
        }
    
        public function render()
        {
           $foo = $this->myClassService->reuse_code($param);
           return view('my.view',compact('foo'));
        }
    }

edited Jun 27, 2022 at 19:11

answered Feb 26, 2021 at 17:52

Pathros

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2 Comments

Theodory Over a year ago

Yes when you're inside livewire component you can inject service class using mount() method.

fuziion_dev Over a year ago

I know this is an old post but I am encountering a similar issue where I load my class in mount just like you however I get the error that the class is called before being initialized.

sh6210 · Accepted Answer · 2023-05-24 16:12:49Z

10

Livewire's boot method Runs on every request, immediately after the component is instantiated, but before any other lifecycle methods are called

Here's the solution worked for me.

public bool $checkAllRecords = false;

public array $checkedRecords = [];

private MailService $service;

public function boot(MailInterface $service)
{
    $this->service = $service;
}

public function updatingCheckAllRecords($value)
{
    $this->checkRecords = $value ? (array) $this->service->getListData($this->perPage, $this->search)->pluck('id') : []
}

edited May 24, 2023 at 16:12

answered Oct 14, 2021 at 17:44

sh6210

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Comments

Azeame · Accepted Answer · 2024-02-07 02:29:10Z

0

Adding a public function boot() method to the component can be useful for things like initializing protected properties, which do not need to be persisted between requests. Below is an example of initializing a protected property as an Eloquent model from the Livewire documentation:

use Livewire\Attributes\Locked;
use Livewire\Component;
use App\Models\Post;
 
class ShowPost extends Component
{
    #[Locked]
    public $postId = 1;
 
    protected Post $post;
 
    public function boot() 
    {
        $this->post = Post::find($this->postId);
    }
 
    // ...
}

See https://livewire.laravel.com/docs/lifecycle-hooks#boot

edited Feb 7, 2024 at 2:29

Azeame

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answered Feb 1, 2024 at 13:09

amiralidev

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