[TYPO3-mvc] Preparing extensions for 6.x

[Jan Kornblum]

Hi group,

i want to get common on how to prepare extensions for 6.x and later. So 
as a first step i want to try it with a very simple extension: the 
extension offers a slider for teaserelements. there is a database table 
containing the "teaserelements" (title, text, link, image, and so on) 
and an additional field in table "pages" (added to rootline-fields), 
where the teaserelement uids are stored as commaseperated list. the 
extenions code walks through the rootline 
(foreach($GLOBALS['TSFE']->rootLine as $element){}) to get the uids of 
the "teaserelements".

As far as i know tslib_pibase features will still be available after 
6.x because this class will still extists under a different name. So in 
case of this very simple extension it shouldn't be difficult to adjust 
the extensions code. but i want to put it on completely "new feets" 
without using old pibase features, just for learning a little more;)

What would be a good way to do it with extbase and especially how to 
realize the relation between "pages" and "teaserelements" and the 
rootline-functionality? I suppose that extbase won't support any 
comma-separated-list relations in "pages", is this correct? So in this 
case i would have to create a "pages" model and a "teaserlement" model 
with an m:n relation, right? But in this case how could i "walk through 
the rootline" as the relation isn't stored in an additional field in 
table "pages" any longer, but in a third relations-table?

Another idea is to only create a "teaserelement" model (model, 
repository, controller, view), extend pages with an additional field 
where the teaserelement-uids are stored as it has been before (but not 
creating a model for "pages" at all) and adding a new method to the 
"teaserelement" repository like "findByRootline()". In this context, 
should i use TYPO3\CMS\Core\Utility\RootlineUtility instead of 
"$GLOBALS['TSFE']->rootLine"?

I know this is a very simple and certainly not difficult example, but i 
just would just like to know how others, which are more "extbase 
experienced", would solve it ;)

Kind regards, Jan