public function ViewsDataHelper::fetchFields in Drupal 8

Same name and namespace in other branches

1. 9 core/modules/views/src/ViewsDataHelper.php \Drupal\views\ViewsDataHelper::fetchFields()

Fetches a list of all fields available for a given base type.

Parameters

array|string $base: A list or a single base_table, for example node.

string $type: The handler type, for example field or filter.

bool $grouping: Should the result grouping by its 'group' label.

string $sub_type: An optional sub type. E.g. Allows making an area plugin available for header only, instead of header, footer, and empty regions.

Return value

array A keyed array of in the form of 'base_table' => 'Description'.

File

core/modules/views/src/ViewsDataHelper.php, line 52

Class

ViewsDataHelper

Defines a helper class for stuff related to views data.

Namespace

Drupal\views

Code

public function fetchFields($base, $type, $grouping = FALSE, $sub_type = NULL) {
  if (!$this->fields) {
    $data = $this->data
      ->getAll();

    // This constructs this ginormous multi dimensional array to
    // collect the important data about fields. In the end,
    // the structure looks a bit like this (using nid as an example)
    // $strings['nid']['filter']['title'] = 'string'.
    //
    // This is constructed this way because the above referenced strings
    // can appear in different places in the actual data structure so that
    // the data doesn't have to be repeated a lot. This essentially lets
    // each field have a cheap kind of inheritance.
    foreach ($data as $table => $table_data) {
      $bases = [];
      $strings = [];
      $skip_bases = [];
      foreach ($table_data as $field => $info) {

        // Collect table data from this table
        if ($field == 'table') {

          // calculate what tables this table can join to.
          if (!empty($info['join'])) {
            $bases = array_keys($info['join']);
          }

          // And it obviously joins to itself.
          $bases[] = $table;
          continue;
        }
        foreach ([
          'field',
          'sort',
          'filter',
          'argument',
          'relationship',
          'area',
        ] as $key) {
          if (!empty($info[$key])) {
            if ($grouping && !empty($info[$key]['no group by'])) {
              continue;
            }
            if ($sub_type && isset($info[$key]['sub_type']) && !in_array($sub_type, (array) $info[$key]['sub_type'])) {
              continue;
            }
            if (!empty($info[$key]['skip base'])) {
              foreach ((array) $info[$key]['skip base'] as $base_name) {
                $skip_bases[$field][$key][$base_name] = TRUE;
              }
            }
            elseif (!empty($info['skip base'])) {
              foreach ((array) $info['skip base'] as $base_name) {
                $skip_bases[$field][$key][$base_name] = TRUE;
              }
            }
            foreach ([
              'title',
              'group',
              'help',
              'base',
              'aliases',
            ] as $string) {

              // First, try the lowest possible level
              if (!empty($info[$key][$string])) {
                $strings[$field][$key][$string] = $info[$key][$string];
              }
              elseif (!empty($info[$string])) {
                $strings[$field][$key][$string] = $info[$string];
              }
              elseif (!empty($table_data['table'][$string])) {
                $strings[$field][$key][$string] = $table_data['table'][$string];
              }
              elseif ($string == 'help') {
                $strings[$field][$key][$string] = '';
              }
              else {
                if ($string != 'base') {
                  $strings[$field][$key][$string] = new FormattableMarkup("Error: missing @component", [
                    '@component' => $string,
                  ]);
                }
              }
            }
          }
        }
      }
      foreach ($bases as $base_name) {
        foreach ($strings as $field => $field_strings) {
          foreach ($field_strings as $type_name => $type_strings) {
            if (empty($skip_bases[$field][$type_name][$base_name])) {
              $this->fields[$base_name][$type_name]["{$table}.{$field}"] = $type_strings;
            }
          }
        }
      }
    }
  }

  // If we have an array of base tables available, go through them
  // all and add them together. Duplicate keys will be lost and that's
  // Just Fine.
  if (is_array($base)) {
    $strings = [];
    foreach ($base as $base_table) {
      if (isset($this->fields[$base_table][$type])) {
        $strings += $this->fields[$base_table][$type];
      }
    }
    uasort($strings, [
      'self',
      'fetchedFieldSort',
    ]);
    return $strings;
  }
  if (isset($this->fields[$base][$type])) {
    uasort($this->fields[$base][$type], [
      $this,
      'fetchedFieldSort',
    ]);
    return $this->fields[$base][$type];
  }
  return [];
}