FOF30\Model\DataModel::canDelete PHP Method

    public function canDelete($oid = null, $joins = null)
    {
        $pkField = $this->getKeyName();
        if ($oid) {
            $this->{$pkField} = intval($oid);
        }
        if (!$this->{$pkField}) {
            throw new \InvalidArgumentException('Master table should be loaded or an ID should be passed');
        }
        if (is_array($joins)) {
            $db = $this->getDbo();
            $query = $db->getQuery(true)->select($db->qn('master') . '.' . $db->qn($pkField))->from($db->qn($this->tableName) . ' AS ' . $db->qn('master'));
            $tableNo = 0;
            foreach ($joins as $table) {
                // Sanity check on passed array
                $check = array('idfield', 'idalias', 'name', 'joinfield', 'label');
                $result = array_intersect($check, array_keys($table));
                if (count($result) != count($check)) {
                    throw new \InvalidArgumentException('Join array missing some keys, please check the documentation');
                }
                $tableNo++;
                $query->select(array('COUNT(DISTINCT ' . $db->qn('t' . $tableNo) . '.' . $db->qn($table['idfield']) . ') AS ' . $db->qn($table['idalias'])));
                $query->join('LEFT', $db->qn($table['name']) . ' AS ' . $db->qn('t' . $tableNo) . ' ON ' . $db->qn('t' . $tableNo) . '.' . $db->qn($table['joinfield']) . ' = ' . $db->qn('master') . '.' . $db->qn($pkField));
            }
            $query->where($db->qn('master') . '.' . $db->qn($pkField) . ' = ' . $db->q($this->{$pkField}));
            $query->group($db->qn('master') . '.' . $db->qn($pkField));
            $this->getDbo()->setQuery((string) $query);
            $obj = $this->getDbo()->loadObject();
            $msg = array();
            $i = 0;
            foreach ($joins as $table) {
                $pkField = $table['idalias'];
                if ($obj->{$pkField} > 0) {
                    $msg[] = \JText::_($table['label']);
                }
                $i++;
            }
            if (count($msg)) {
                $option = $this->container->componentName;
                $comName = $this->container->bareComponentName;
                $tbl = $this->getTableName();
                $tview = str_replace('#__' . $comName . '_', '', $tbl);
                $prefix = $option . '_' . $tview . '_NODELETE_';
                $message = '<ul>';
                foreach ($msg as $key) {
                    $message .= '<li>' . \JText::_(strtoupper($prefix . $key)) . '</li>';
                }
                $message .= '</ul>';
                throw new \RuntimeException($message);
            }
        }
    }