Well... I'm working on a situation where I have 2 subcategories that both come from a master category and multi-level inheritance was really neccessary[ie define fields on the master category and the children, and the children would inherit the master].For the most part, this isn't a problem because K2 doesn't care what data you put in the field, it stores it no matter what.However, loading the select boxes it does care about... so I ended up with the following core hack:Replace the extrafields function in both controller\item.php files [one on the frontend, one on the back]
That's it...it handles circular logic[3 categories , ABC where A is the parent to B, B is the parent to C, and C is the parent to A] - so once it goes around the cycle it gives up.It handles duplicate logic[3 Categories where you have Cart --> Order --> Saved Cart and 2 extra group fields, one called ShoppingCart and one called Orders... Cart and saved Cart are both of Extra group Shopping cart..... The code tracks which group sets it has loaded and won't load Cart ShoppingCart a second time]Enjoy.....
