/**
  * Set Validation rules for Form
  * @param $input
  * @return mixed
  */
 private function setValidationRules($input)
 {
     //Set Form validation rules
     return Validator::instance($input, function ($validate) {
         $validate->addRule('product_name', 'required|min:5')->addRule('category', 'required|min:5')->addRule('description', 'required|min:5')->addRule('validity', 'required|min:5')->addRule('price', 'required|min:5')->addRule('created_at', 'required|min:5')->addRule('updated_at', 'required|min:5');
         return $validate;
     });
 }