TYPO3 Core

Maybe this issue is stronly related to http://bugs.typo3.org/view.php?id=13665...
I found the ticket right now.

Hi, Alex

Thanks for answering on this old ticket.

I tried it now again, with a TYPO3 v6.2.x installation and got the following confirmed:

Moving a page in to or out from the menu SOMETIME triggers cache-clearing. To keep the example, I had initially, I tried it again by moving page3 to the following places:

Initial:

• Startpage (current view)
  • page 1
  • page 2
  • page 3

Moving page 3 to the following places triggers cache-clearing:

• Startpage (current view)
  • page 1
  • page 3
  • page 2

• Startpage (current view)
  • page 1
  • page 2
• page 3

And now, what doesn't trigger cache-clearing:

• Startpage (current view)
  • page 1
  • page 2
    • page 3

Please write back if you can't confirm it.

I don't have such a setup yet.

Can you please check the page cache on your last test, which pages get cleared?

Hi, Alex

Yea, there is an entry left there, having the id 1 ... but that doesn't tell me much. I can't look into the binary content. I can just tell you, that the md5-string for the identifier remained the same as for the startpage ;) (confirmed that by clearing the cache and just loading the startpage)

In cf_cache_pages_tags you will find the information which identifier is for which page.

So if you move the page it seams the page cache is cleared for Page2 and Page3 but not for Page1?

As I remember correctly the page is cache is normally cleared for the neighbors and childs of an edited Page record. So it seams this cache clearing doesn't know of the move and do not clear the page cache of the neighbors for his old position.

Does this describes your problem?

Hi, Alexander

Right. That's exactly the case.

The cache for Page1 is not cleared when moving Page3 into Page2 (see my example yesterday, not the initial one ;)).

But as I see it: This is a matter of compromise ... You, upfront, have to know what the menu is, and clear the cache depending on whether the structure has changed - depending on what kind of menu it is (to make it perfect ;)).

But it's quite usual, that you have a menu, listing all children ;) So therefore, I think, it's quite natural to clear the cache for the parent-page of the old position.

I don't know whose cache to clear else. Depending on the menu (when using an expanded menu) you have to clear the cache of more pages here. But at least the parent of the old position should be in the list of pages to clear the cache for ;)

What's your opinion on that?

Mathias Schreiber wrote in #note-10:

We'r sorry to say, but Frank and me consider this issue unsolvable.

I like the spirit of this answer.