class FieldInstancePerFormDisplay

class FieldInstancePerFormDisplay extends DrupalSqlBase {
    
    /**
     * {@inheritdoc}
     */
    protected function initializeIterator() {
        $rows = [];
        $result = $this->prepareQuery()
            ->execute();
        while ($field_row = $result->fetchAssoc()) {
            $bundle = $field_row['type_name'];
            $field_name = $field_row['field_name'];
            $index = "{$bundle}.{$field_name}";
            $rows[$index]['type_name'] = $bundle;
            $rows[$index]['widget_active'] = (bool) $field_row['widget_active'];
            $rows[$index]['field_name'] = $field_name;
            $rows[$index]['type'] = $field_row['type'];
            $rows[$index]['module'] = $field_row['module'];
            $rows[$index]['weight'] = $field_row['weight'];
            $rows[$index]['widget_type'] = $field_row['widget_type'];
            $rows[$index]['widget_settings'] = unserialize($field_row['widget_settings']);
            $rows[$index]['display_settings'] = unserialize($field_row['display_settings']);
        }
        return new \ArrayIterator($rows);
    }
    
    /**
     * {@inheritdoc}
     */
    public function query() {
        $query = $this->select('content_node_field_instance', 'cnfi')
            ->fields('cnfi', [
            'field_name',
            'type_name',
            'weight',
            'label',
            'widget_type',
            'widget_settings',
            'display_settings',
            'description',
            'widget_module',
            'widget_active',
        ])
            ->fields('cnf', [
            'type',
            'module',
        ]);
        $query->join('content_node_field', 'cnf', '[cnfi].[field_name] = [cnf].[field_name]');
        $query->orderBy('cnfi.weight');
        return $query;
    }
    
    /**
     * {@inheritdoc}
     */
    public function fields() {
        return [
            'field_name' => $this->t('The machine name of field.'),
            'type_name' => $this->t('Content type where this field is used.'),
            'weight' => $this->t('Weight.'),
            'label' => $this->t('A name to show.'),
            'widget_type' => $this->t('Widget type.'),
            'widget_settings' => $this->t('Serialize data with widget settings.'),
            'display_settings' => $this->t('Serialize data with display settings.'),
            'description' => $this->t('A description of field.'),
            'widget_module' => $this->t('Module that implements widget.'),
            'widget_active' => $this->t('Status of widget'),
        ];
    }
    
    /**
     * {@inheritdoc}
     */
    public function getIds() {
        $ids['type_name']['type'] = 'string';
        $ids['field_name']['type'] = 'string';
        return $ids;
    }

}