Ip\Internal\Grid\Model\Config::checkConfig PHP Method

    protected function checkConfig(&$config, $depth = 1, $gridBreadcrumb = array())
    {
        $fields =& $config['fields'];
        if (!is_array($fields)) {
            throw new \Ip\Exception('GRID configuration is missing \'fields\' attribute for table ' . $config['table']);
        }
        foreach ($fields as &$field) {
            if (empty($field['type'])) {
                $field['type'] = 'Text';
            }
        }
        //if at least one of the fields is of type 'Tab', then make sure the first field is also 'Tab'. Otherwise tabs don't work.
        if ($fields[0]['type'] != 'Tab') {
            $tabExist = false;
            foreach ($fields as $key => $fieldData) {
                if (!empty($fieldData['type']) && $fieldData['type'] == 'Tab') {
                    $tabExist = true;
                    break;
                }
            }
            if ($tabExist) {
                array_unshift($fields, array('label' => __('General', 'Ip-admin', false), 'type' => 'Tab'));
            }
        }
        //automatically add gridId to grid fields
        $gridIndex = 0;
        foreach ($fields as $key => &$fieldData) {
            if (!empty($fieldData['type']) && $fieldData['type'] == 'Grid') {
                $gridIndex++;
                if (empty($fieldData['gridId'])) {
                    $fieldData['gridId'] = 'grid' . $gridIndex;
                }
                $subConfig = $fieldData['config'];
                $loop = false;
                foreach ($gridBreadcrumb as $crumb) {
                    if ($subConfig == $crumb) {
                        $loop = true;
                    }
                }
                if (!$loop) {
                    $newBreadcrumb = array_merge($gridBreadcrumb, array($config));
                    $this->checkConfig($fieldData['config'], $depth + 1, $newBreadcrumb);
                }
            }
        }
        if ($depth == 1) {
            $this->configChecked = true;
        }
    }