public function alterSchema(Schema $schema)
 {
     $customizedType = Inflector::singularize($schema->name());
     $customFields = $this->find()->cache('custom_fields_' . $this->connection()->configName());
     /** @var \Muffin\Webservice\Model\Resource[] $customFields */
     foreach ($customFields as $customField) {
         if ($customField->customized_type !== $customizedType) {
             continue;
         }
         $columnKeys = ['type' => $customField->field_format, 'default' => $customField->default_value, 'custom_field_id' => $customField->id, 'custom_field_filterable' => $customField->is_filter];
         $schema->addColumn(Schema::nameToField($customField->name), $columnKeys);
     }
     return $schema;
 }