Scalr\Model\AbstractEntity::update PHP Method

    public function update($fieldValues)
    {
        $it = $this->getIterator();
        $pk = $it->getPrimaryKey();
        if (empty($pk)) {
            throw new ModelException(sprintf("Primary key has not been defined with @Id tag for %s", get_class($this)));
        }
        $stmtFields = $stmtWhere = '';
        $arguments = $argumentsPk = [];
        foreach ($pk as $name) {
            $field = $it->getField($name);
            if (!isset($this->{$name})) {
                throw new ModelException(sprintf('Field "%s" is not initialized inside the %s.', $name, get_class($this)));
            } else {
                $stmtWhere .= ' AND ' . $field->getColumnName() . ' = ' . $field->type->wh();
                $argumentsPk[] = $field->type->toDb($this->{$name});
            }
        }
        if ($stmtWhere != '') {
            $stmtWhere = substr($stmtWhere, 5);
        }
        foreach ($fieldValues as $fieldName => $value) {
            if (is_numeric($fieldName)) {
                $fieldName = $value;
                $itselfValue = true;
            } else {
                $itselfValue = false;
            }
            $field = $it->getField($fieldName);
            if ($field === null) {
                throw new ModelException(sprintf('Field "%s" does not exist in %s.', $fieldName, get_class($this)));
            }
            if (isset($field->id)) {
                if (!$itselfValue && $value != $this->{$fieldName}) {
                    throw new ModelException(sprintf('It is forbidden to change PK value from the update() method. ' . 'Field "%s" of the %s is the part of the Primary Key.', $fieldName, get_class($this)));
                }
                continue;
            }
            if (!$itselfValue) {
                $this->{$fieldName} = $value;
            }
            if (!isset($this->{$fieldName}) && $field->column->nullable) {
                $stmtFields .= ', ' . $field->getColumnName() . ' = NULL';
            } else {
                $stmtFields .= ', ' . $field->getColumnName() . ' = ' . $field->type->wh();
                $arguments[] = $field->type->toDb($this->{$fieldName});
            }
        }
        if (!empty($stmtFields)) {
            $stmtFields = substr($stmtFields, 2);
            //Saves record making insert or update
            $this->db()->Execute("UPDATE " . $this->table() . " " . "SET " . $stmtFields . " " . "WHERE " . $stmtWhere . " LIMIT 1", array_merge($arguments, $argumentsPk));
        }
    }