CompanyController.php

    public function store(Request $request)
    {
        $db = new Db($request, new CompanyDatabase);
        $db->add();

        return $db->getResult();
    }

CompanyDatabase.php

//abstract class contains basic form validation and file validation

class CompanyDatabase extends DocumentAbstract
{
    protected function validationRules($id = NULL)
    {
        return [
            'owner' => "required|unique:companies,owner," . $id .
                ",id,revision," . $this->request->revision .
                ",control_id," . $this->request->control_id .
                ",file_name," . $this->request->file_name .
                ",date_upload," . $this->request->date_upload,

            'revision' => 'required|min:2',
            'control_id' => 'required',
            'category_id' => 'required',
            'category_name' => 'required',
            'file_name' => 'required',
            'date_upload' => 'required',
            'file' => "required|mimes:pdf"
        ];
    }

    public function addNewDataToTable()
    {
        $newCompanySpecification = company::create($this->request->all());

        $this->setResult($newCompanySpecification);
    }
    
    public function getResult() {
      return $this->result;
    }
}

Db.php

class Db
{
    protected $db;
    private $request;

    public function __construct($request, DocumentInterface $db)
    {
        $this->request = $request;
        $this->db = $db;
    }

    public function add()
    {
        $this->db->validateRequest($this->request);
        $this->db->addNewDataToTable();
    }
}