Tickets :: Comment on [#10880] Rdo: Make *- to-one-relations aware of "no relation" state

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Comment	> I feel the current behaviour of Horde_Rdo resolving to-one-relations > for the corner case of NULL or "empty string" in the relation key > field is misleading. > > Example: > > Two data entities exist, a network host table and a certificate table. > A host may or may not have a certificate. > > Since certificates are managed for other objects too it is not > feasible to reverse the relation and say the certificate must > reference the host. > > CREATE TABLE `appname_hosts` ( > `host_id` int(10) NOT NULL auto_increment, > `certificate_id` int(10) default NULL, > #[... more fields that don't matter here] > PRIMARY KEY (`host_id`) > ) ENGINE=MyISAM AUTO_INCREMENT=125 DEFAULT CHARSET=latin1 > > CREATE TABLE `appname_certificates` ( > `certificate_id` int(10) unsigned NOT NULL auto_increment, > `certificate_crt` text, > `certificate_key` text, > `ca_id` int(10) default NULL, > `certificate_cn` varchar(100) default NULL, > `certificate_csr` text, > `certificate_pkcs12` text, > PRIMARY KEY (`certificate_id`) > ) ENGINE=MyISAM AUTO_INCREMENT=151 DEFAULT CHARSET=latin; > > Now we have a Appname_HostMapper Class with relation > > protected $_lazyRelationships = array( > 'certificate' => array('type' => Horde_Rdo::ONE_TO_ONE, > 'foreignKey' => 'certificate_id', > 'mapper' => 'Appname_CertificateMapper') > ); > > Now when I have a Host table entry with value of '' or NULL, I do get > an instance of Appname_Certificate as a response, usually the first > entry in the table (with default order). > > Rdo currently doesn't understand the concept of a missing relation. > I'd suggest to either return no object or an exception. > Consistence with to-many-relations is hard. > These relations always return a list object, possibly an empty one. > As to-one-relations are often used in chains (at least in my code) > I'd prefer a clean exception over an empty result but the current > situation is worst for me. > > My current workaround is to check length($this->certificate_id) > before accessing $this->certificate but it's obviously not a clean > solution. > > I've classified this as an enhancement rather than a bug because it > breaks current behaviour and Rdo possibly wasn't designed with this > case in mind.
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