EntityViewsData::mapSingleFieldViewsData

protected EntityViewsData::mapSingleFieldViewsData($table, $field_name, $field_type, $column_name, $column_type, $first, FieldDefinitionInterface $field_definition)

protected function mapSingleFieldViewsData($table, $field_name, $field_type, $column_name, $column_type, $first, FieldDefinitionInterface $field_definition) {
  $views_field = array();

  // Provide a nicer, less verbose label for the first column within a field.
  // @todo Introduce concept of the "main" column for a field, rather than
  //   assuming the first one is the main column.
  if ($first) {
    $views_field['title'] = $field_definition->getLabel();
  }
  else {
    $views_field['title'] = $field_definition->getLabel() . " ($column_name)";
  }

  if ($description = $field_definition->getDescription()) {
    $views_field['help'] = $description;
  }

  // Set up the field, sort, argument, and filters, based on
  // the column and/or field data type.
  // @todo Allow field types to customize this.
  // @see https://www.drupal.org/node/2337515
  switch ($field_type) {
    // Special case a few field types.
    case 'timestamp':
    case 'created':
    case 'changed':
      $views_field['field']['id'] = 'field';
      $views_field['argument']['id'] = 'date';
      $views_field['filter']['id'] = 'date';
      $views_field['sort']['id'] = 'date';
      break;

    case 'language':
      $views_field['field']['id'] = 'field';
      $views_field['argument']['id'] = 'language';
      $views_field['filter']['id'] = 'language';
      $views_field['sort']['id'] = 'standard';
      break;

    case 'boolean':
      $views_field['field']['id'] = 'field';
      $views_field['argument']['id'] = 'numeric';
      $views_field['filter']['id'] = 'boolean';
      $views_field['sort']['id'] = 'standard';
      break;

    case 'uri':
      // Let's render URIs as URIs by default, not links.
      $views_field['field']['id'] = 'field';
      $views_field['field']['default_formatter'] = 'string';

      $views_field['argument']['id'] = 'string';
      $views_field['filter']['id'] = 'string';
      $views_field['sort']['id'] = 'standard';
      break;

    case 'text':
    case 'text_with_summary':
      // Treat these three long text fields the same.
      $field_type = 'text_long';
      // Intentional fall-through here to the default processing!

    default:
      // For most fields, the field type is generic enough to just use
      // the column type to determine the filters etc.
      switch ($column_type) {

        case 'int':
        case 'integer':
        case 'smallint':
        case 'tinyint':
        case 'mediumint':
        case 'float':
        case 'double':
        case 'decimal':
          $views_field['field']['id'] = 'field';
          $views_field['argument']['id'] = 'numeric';
          $views_field['filter']['id'] = 'numeric';
          $views_field['sort']['id'] = 'standard';
          break;

        case 'char':
        case 'string':
        case 'varchar':
        case 'varchar_ascii':
        case 'tinytext':
        case 'text':
        case 'mediumtext':
        case 'longtext':
          $views_field['field']['id'] = 'field';
          $views_field['argument']['id'] = 'string';
          $views_field['filter']['id'] = 'string';
          $views_field['sort']['id'] = 'standard';
          break;

        default:
          $views_field['field']['id'] = 'field';
          $views_field['argument']['id'] = 'standard';
          $views_field['filter']['id'] = 'standard';
          $views_field['sort']['id'] = 'standard';
      }
  }

  // Do post-processing for a few field types.

  $process_method = 'processViewsDataFor' . Container::camelize($field_type);
  if (method_exists($this, $process_method)) {
    $this->{$process_method}($table, $field_definition, $views_field, $column_name);
  }

  return $views_field;
}