LAR_Maintenance/app/Livewire/Maintenance/Form.php

<?php

namespace App\Livewire\Maintenance;

use App\Models\Host;
use Livewire\Component;
use App\Models\Maintenance;

class Form extends Component
{
    public $model;
    public string $name = "";
    public string $description = "";
    public string $schedule = "";

    public $action = 'store';

    public $hosts = [];
    public $hosts_available = [];


    protected function rules()
    {
        return [
            'name' => 'required',
            'description' => 'required',
            'schedule' => 'required',
        ];
    }

    public function mount($model = null)
    {
        $this->hosts_available = Host::all()->pluck('hostname', 'id')->toArray();
        if (!empty($model)) {
            $maintenance = Maintenance::find($model);

            $this->model = $model;

            $this->name = $maintenance->name;
            $this->description = $maintenance->description;
            $this->schedule = $maintenance->schedule;
            $this->hosts = $maintenance->hosts()->pluck('hosts.id')->toArray();

            $this->action = 'update';
        }
    }

    public function store()
    {
        $validatedData = $this->validate();
        $maintenance = Maintenance::create($validatedData);
        $hosts = Host::whereIn('id', $this->hosts)->get();
        foreach ($hosts as $key => $host) {
            $maintenance->hosts()->attach($host);
        }
        $this->dispatch('closeModal');
    }

    public function update()
    {
        $validatedData = $this->validate();
        $maintenance = Maintenance::find($this->model);
        $maintenance->hosts()->whereNotIn('host_id', $this->hosts)->delete();

        if (!empty($maintenance)) {
            $maintenance->update($validatedData);
            $hosts = Host::whereIn('id', $this->hosts)->whereNotIn('id', $maintenance->hosts()->pluck('hosts.id')->toArray())->get();
            foreach ($hosts as $key => $host) {
                $maintenance->hosts()->attach($host);
            }
        }

        $this->dispatch('closeModal');
    }

    public function render()
    {
        return view('livewire.maintenance.form');
    }

    public function addHost()
    {
        $this->hosts[] = [];
    }

    public function removeHost($id)
    {
        unset($this->hosts[$id]);
    }
}