[StorageListItem] add definitive StorageList (Order/Wishlist) field to Item

[dpfaffenbauer]

Q	A
Bug fix?	yes
New feature?	yes
BC breaks?	no
Deprecations?	no
Fixed tickets	#2115

@TobiSW This is a different approach to the issue. This solves the underlying issue of the relation between order and order-item (eg. storage-list and storage-list-item).

@dkarlovi @solverat @breakone Any thoughts on that?

[solverat]

Mhmm. It would be interesting to know why the message appears at all. Is it because in V2 the objects were saved more often?

However, it's a relation more but also no more do/while magic.

[dpfaffenbauer]

@solverat It happens because the order gets moved and processed before saved. so the items are still in the old location. so the parent is basically not there anymore for the item

[solverat]

Ah I see, that's because of the cart/order behavior (same object)!

Well, that's going to be a heavy migration then. :)

[dpfaffenbauer]

@solverat exactly. About the migration: Well, yes... There is the other PR #2116 too, which just does a save before doing the calculations.

But I think in the long term, it is better to have a real relation between the two.