Try this.

// Article.php
public function scopeDescs($query, $LanguageID = null)
	{
		if($LanguageID)
			return $query->descriptions()->where('LanguageID',$LanguageID)->first();
		return $query->descriptions()->first();
	}

in controller

$article->descs($lang->LanguageID);
$article->descs();

Ty othmanus. I deleted "getDescriptionsAttribute" and copied this scope but: "Call to undefined method Illuminate\Database\Query\Builder::descriptions()". Descriptions is not a field, it's just a relationship. I did anything wrong?

I have a foreach of languages in my view and by each language I want to get $article->descs($language->id).

// Article.php (Model)
public function descriptions()
{
        return $this->hasMany('\App\Models\ArticleDescription',"ArticleID");
}

public function scopeDescs($query, $LanguageID = null)
{
        if($LanguageID)
            return $query->descriptions()->where('LanguageID','=',$LanguageID)->first();

        return $query->descriptions()->first();
}

//ArticleController
$article = Article::with('descriptions')->find($id);

//View
@foreach($languages as $language)
    <?php $description = $article->descs($language->id);?>
@endforeach

Ty for help.