Devise\Pages\Fields\FieldManager::resetField PHP Method

    public function resetField($fieldId, $scope)
    {
        $field = $scope === 'global' ? $this->GlobalField->findOrFail($fieldId) : $this->Field->findOrFail($fieldId);
        $field->json_value = '{}';
        $field->values->override([]);
        $field->save();
        return $field;
    }

 /**
  * Resets a fields values
  *
  * @param  integer $fieldId
  * @return json
  */
 public function requestReset($fieldId, $scope)
 {
     $field = $this->Manager->resetField($fieldId, $scope);
     return $field;
 }