LAR_Maintenance/app/Livewire/Host/Form.php

<?php
namespace App\Livewire\Host;

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

class Form extends Component
{
    public $model;
    public string $hostname;

    public $host_groups = [];
    public $host_groups_available = [];

    public $action = 'store';

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

    public function mount ($model = null){
        $this->host_groups_available = HostGroup::pluck('name', 'id')->toArray();

        if (!empty($model)) {
            $host = Host::find($model);

            $this->model = $model;

            $this->hostname = $host->hostname;
            $this->host_groups = $host->hostGroups()->pluck('host_groups.id')->toArray();

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

    public function store()
    {
        $validatedData = $this->validate();
        $host = Host::create($validatedData);
        $host->hostGroups()->sync($this->host_groups);
        $this->dispatch('closeModal');
    }

    public function update()
    {
        $validatedData = $this->validate();
        $host = Host::find($this->model);
        if (!empty($host)) {
            $host->update($validatedData);
            $host->hostGroups()->sync($this->host_groups);
        }
        $this->dispatch('closeModal');
    }

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