$pages->delete throws Exception although there is no child anymore

[foxcraft_aw]

Hello!

I have a strange problem with the "delete" method of the "pages" API-variable: When I insert a parent- and a child-page, and then immediately try to delete first the child- and then the parent-page, an exception is thrown telling me that the parent cannot be deleted, because it still contains a child-page.

You can reproduce this behaviour using the following code:

<?php

require 'index.php';

$parentPage = new ProcessWire\Page;
$parentPage->name = 'parent';
$parentPage->template = 'basic-page';
$parentPage->title = 'parent';
$parentPage->parent = $pages->get('/');
$parentPage->save();

$childPage = new ProcessWire\Page;
$childPage->name = 'child';
$childPage->template = 'basic-page';
$childPage->title = 'child';
$childPage->parent = $pages->get('/parent');
$childPage->save();

$pages->delete($pages->get('/parent/child'));
$pages->delete($pages->get('/parent'));

(I put this code into a file called "experiments.php" in the root directory of the site, because I do not know of any better way for quickly testing out code in ProcessWire yet)

 

Can you tell me why this code throws an exception?
What am I missing?

I am using ProcessWire 3.

Thanks for your help!

 

PS: Yes, I know about the second parameter in the "$pages->delete" method, but it should not be necessary to be set in this scenario if I`m correct.

[BitPoet]

Does uncaching the parent page fix it?

$pages->delete($pages->get('/parent/child'));

$prnt = $pages->get('/parent');
$pages->uncache($prnt);
$pages->delete($prnt);

 

[foxcraft_aw]

34 minutes ago, BitPoet said:

Does uncaching the parent page fix it?

$pages->delete($pages->get('/parent/child'));

$prnt = $pages->get('/parent');
$pages->uncache($prnt);
$pages->delete($prnt);

 

Thanks for the tip!
It does not work when I only uncache the parent, but it does work when I simply uncache all pages:

$pages->delete($pages->get('/parent/child'));

$pages->uncache();
$pages->delete($pages->get('/parent'));

 

I did not know there was some caching going on behind the scenes. Do you know about any documentation on this mechanism?

 

[BitPoet]

1 hour ago, foxcraft_aw said:

Do you know about any documentation on this mechanism?

Only the bits and pieces I picked up in forum discussions. A search for "uncache" brings up some interesting topics, mostly about manipulating large numbers of pages through the api.

[foxcraft_aw]

Okay I'll have a look, thanks for the insights!