ldc-crm/app/Models/Answer.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;

/**
 * @property integer $id                                   Id.
 * @property string  $answer                               Answer.
 * @property integer $question_id                          Foreign key Question.
 * @property-read \Illuminate\Support\Carbon $created_at   Created date.
 * @property-read \Illuminate\Support\Carbon $updated_at   Updated date.
 *
 * @property-read \App\Models\Question $question Question BelongsTo relation.
 * @property-read \Illuminate\Database\Eloquent\Collection<App\Models\Customer>
 * $customers Customer BelongsToMany relation.
 */
class Answer extends Model
{
    use HasFactory;

    /**
     * The attributes that are mass assignable.
     *
     * @var string[]
     */
    protected $fillable = [
        'answer',
    ];

    // * RELATIONS

    /**
     * Question BelongsTo relation.
     *
     * @return \Illuminate\Database\Eloquent\Relations\BelongsTo
     */
    public function question(): \Illuminate\Database\Eloquent\Relations\BelongsTo
    {
        return $this->belongsTo(Question::class);
    }

    /**
     * Customer belongsToMany relation.
     *
     * @return \Illuminate\Database\Eloquent\Relations\BelongsToMany
     */
    public function customers(): \Illuminate\Database\Eloquent\Relations\BelongsToMany
    {
        return $this->belongsToMany(Customer::class, 'customer_answer');
    }
}