[TYPO3-mvc] Blog Example and Value Object question

[Franz Koch]

Hi,

> How do I access the post repository from the blog repository? Somehow I don't understand why not the
> blog repository can get the findByTag() method.

I think the method shouldn't be inside the blogRepository but the blog 
model as aggregate root if I understood Jochen correctly. If you like to 
move it to a repository, then the postRepository might be the correct 
one and you would need 4 methods in total for a complete featureset:

findByTag
findAllByTag
findByBlogAndTag
findAllByBlogAndTag

Those methods might also accept arrays as tag parameter, if multiple 
tags/categories get selected/filtered. But for me those 
findByFooAndBarAndFoobar methods look odd, especially if you have 
various enableFields (maybe by having a additional country or language 
filter, author filter and need to combine them). It's just like 
reinventing the wheel for every additional sql criteria you need.

findAllByBlogAndAuthorAndTagAndTimerange($blog,$author,$tag,array('min'=>$date,'max'=>$date))

That's ridiculous and way to much overhead in my eyes as I thought the 
extBase/Flow3 approach would simplify things. A "cleaner" way would be 
to let the blogObject/aggregateRoot itterate over the blogPosts and 
apply various filter options at a time - but that's somewhat slow and 
not applicable on larger projects.

So maybe a more generic method like "findAllByBlogAndMultipleProperties" 
might be the way to go, although writing tests for this might be a bit 
more difficult than for "simpler" methods.

$postRepository->findAllByBlogAndMultipleProperties(
	$blog,
	array (
		'author' => $author,
		'tag' => $date,
		'timerange' => array(
			'min' => $dateMin,
			'max' => $dateMax
		)
	));

What do you think? If you think this would be a good idea, we should 
think of a proper method name and provide a generic 
"findByMultipleProperties" in the abstractRepository of extbase as a) 
usefull addition and b) as a reference for other methods of this type.

-- 
kind regards,
Franz Koch

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