mongo parent using has() with mysql children and hybridrelations

[vesper8]

There must be something I am not understanding here.

I have a Submission model which is a mongo collection and it hasMany images which previously was also a mongo collection. I was using $submissions = Submission::has('images')->get(); and this was working fine, returning all submissions with at least one image.

Now I decided to convert my Image mongo collection to a mysql table and now it seems I can't use has() anymore

Submission.php

use Jenssegers\Mongodb\Eloquent\Model as Eloquent;

class Submission extends Eloquent
{
    protected $connection = 'mongodb';
    protected $collection = 'submissions';

    public function images()
    {
        return $this->hasMany('\App\Models\Image', "submission_id");
    }
}

Image.php

use Illuminate\Database\Eloquent\Model;
use Jenssegers\Mongodb\Eloquent\HybridRelations;

class Image extends Model
{
    use HybridRelations;

    protected $connection = 'default';
    public $table = 'images';

    public function submission()
    {
        return $this->belongsTo('\App\Models\Submission', "submission_id");
    }
}

When I try to run my query I get

BadMethodCallException in Builder.php line 2508:
Call to undefined method Illuminate\Database\Query\Builder::getHasCompareKey()

Please someone help.. been trying to solve this for hours.

[vesper8]

anyone can help please?