Merging multiple model validations

Currently this solution is up and running.
The question would be, could this be more beautiful?

Code:

        // Load SalesModel
        $salesModel = new \App\Models\SalesModel();

        // Load SaleslineModel
        $saleslineModel = new \App\Models\SaleslineModel();
       
        // merge all validation rules
        $rules = array_merge($salesModel->validationRules, $saleslineModel->validationRules);
       
        // Validate the form data
        if ( ! $this->validate($rules) ) {
            return redirect()->back()->withInput()->with('errors', $this->validator->getErrors());
        }