[limb-issues] Assigned: (AR-4) Current implementation of AR does not allow to create single direction one-to-one relation. This should be possible.

[Sergey Yudin (JIRA)]

     [ http://jira.limb-project.com/browse/AR-4?page=all ]

Sergey Yudin reassigned AR-4:
-----------------------------

    Assignee: Sergey Yudin

> Current implementation of AR does not allow to create single direction one-to-one relation. This should be possible.
> --------------------------------------------------------------------------------------------------------------------
>
>                 Key: AR-4
>                 URL: http://jira.limb-project.com/browse/AR-4
>             Project: ACTIVE_RECORD
>          Issue Type: Improvement
>            Reporter: Sergey Yudin
>         Assigned To: Sergey Yudin
>
> Current implementation of AR does not allow to create single direction one-to-one relation.
> One describe one-to-one relation with 2 attrubutes in 2 classes: $_has_on and $_belongs_to, e.g.:
> [code]
> class PersonForTest extends lmbActiveRecord
> {
>   protected $_has_one = array('social_security' => array('field' => 'person_id',
>                                                        'class' => 'SocialSecurityForTest'));
> }
> class SocialSecurityForTest extends lmbActiveRecord
> {
>   protected $_belongs_to = array('person' => array('field' => 'person_id',
>                                                   'class' => 'PersonForTest'));
> }
> [/code]
> There person_id field is stored in social_security_for_test db_table.
> I need to create several single direction one-to-one relations like that I would describe like this:
> [code]
> class CatalogItem extends lmbActiveRecord
> {
>   protected $_has_one = array('large_image' => array('field' => 'image_id',
>                                                                                                   'class' => 'Image'),
>                                                         small_image' => array('field' => 'small_image_id',
>                                                                                                   'class' => 'Image'));
> }
> class Sertificate extends lmbActiveRecord
> {
>   protected $_has_one = array('image' => array('field' => 'image_id'));
> }
> class Image extends lmbActiveRecord
> {
> }
> [/code]
> I want Image objects don't know anything about what objects are related to them.
> We should "revert" our implementation of one-to-one relation that is storing key field in parent table (say in "person_for_test" table as in the first example) not in child table (say in "social_security_for_test" table).
> There are some problems here:
> 1) $_belongs_to is used in one-to-many relations. If we "revert" one-to-one relation we will face problems with one-to-many relations. It seems we will need a new attribute say $_many_belongs_to that will work like the old $_belongs_to

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