[TYPO3-mvc] Conceptual Question with RELATION_HAS_ONE

[Jeff Segars]

Sebastian Fischer wrote:
> Jeff Segars schrieb:
>> Hey guys,
>> I know things are in a bit of flux with all the persistence work 
>> underway but I wanted throw out what is probably an obvious question 
>> on a simple field with RELATION_HAS_ONE.
>>
>> Inside the extbase test cases, 
>> Tx_Extbase_Persistence_Mapper_DataMap_testcase contains a TCA 
>> definition for a blog author that references an author table rather 
>> than just being an input field as it is in blog_example. Since it's 
>> already in the test case, seems like a good example for my question :)
>>
>>> 'author' => array(
>>>     'exclude' => 1,
>>>     'label'   => 
>>> 'LLL:EXT:blog_example/Resources/Language/locallang_db.xml:tx_blogexample_domain_model_blog.author', 
>>>
>>>     'config' => array(
>>>         'type' => 'select',
>>>         'foreign_class' => 'Tx_BlogExample_Domain_Model_Author',
>>>         'foreign_table' => 'tx_blogexample_domain_model_author',
>>>         'maxitems' => 1,
>>>     )
>>> ),
>>
>>  From what I can see of the persistence framework (both in trunk and 
>> in persistence rewrite) it expects that this simple relation also 
>> provides a foreign_field and foreign_table field so that the relation 
>> is saved in the child table rather than the parent table.
>>
>> This of course doesn't match the blog model that would allow the same 
>> author to be assigned multiple blogs and doesn't work with the backend 
>> select type that saves a UID directly in the parent table.
>>
>> It seems like I must be missing something obvious here so if anyone 
>> can enlighten me, it would be greatly appreciated ... and if the 
>> answer is "I'm busy...wait for the persistence rewrite to get done and 
>> it will all work" that's perfectly fine too ;)
>>
>> Thanks,
>> Jeff
> 
> Hi Jeff,
> 
> i guess, but i expect to have one answer here, "take a mm relation", but 
> i agree with you, it should be possible to store the authers id in the 
> blog model and not always store the blog in the author. So it should be 
> possible to get it work without the foreign_table field in the author 
> model.
> 
> As seen in http://en.wikipedia.org/wiki/File:ERD_Representation.svg the 
> Chen notain could go with an extra table birthplace, but like in IDEF1X 
> is also possible to store the place id in the persons dataset.
> 
> Greetings
> Sebastian

Thanks for the response :)  Using an MM relation has been my temporary 
workaround but I'm not too fond of dealing with an array when i just 
want a single object.

Hopefully, we'll get some word on the *right* way to do this soon.

Thanks,
Jeff