lithium\data\source\Database::_on PHP Method

    protected function _on(array $constraints, $aliasFrom, $aliasTo, $mapAlias = array())
    {
        $result = array();
        foreach ($constraints as $key => $value) {
            $isAliasable = !is_numeric($key) && !isset($this->_constraintTypes[$key]) && !isset($this->_operators[$key]);
            if ($isAliasable) {
                $key = $this->_aliasing($key, $aliasFrom, $mapAlias);
            }
            if (is_string($value)) {
                $result[$key] = $this->_aliasing($value, $aliasTo, $mapAlias);
            } elseif (is_array($value)) {
                $result[$key] = $this->_on($value, $aliasFrom, $aliasTo, $mapAlias);
            } else {
                $result[$key] = $value;
            }
        }
        return $result;
    }