"Notice: Undefined offset: 0 " from VarnishPurger when purging a single tag

[varacti]

API Platform version(s) affected: 2.5.8

Description
An exception is thrown from ApiPlatform\Core\HttpCache\VarnishPurger line 70 with the message "Notice: Undefined offset: 0" when purging a single tag.

The purged tags are defined in class ApiPlatform\Core\Bridge\Doctrine\EventListener\PurgeHttpCacheListener as an associative array [ string => string ], for example in function gatherResourceAndItemTags :

114     $iri = $this->iriConverter->getIriFromResourceClass($resourceClass);
        // $iri is supposed to be a string here because of getIriFromResourceClass signature !!!
115     $this->tags[$iri] = $iri;

Then this array is directly send to VarnishPurger from PurgeHttpCacheListener :

106     $this->purger->purge($this->tags);

But if this array contains a single asociation, VarnishPurger fails line 70 and throws an exception.

Possible Solution
Replace "ApiPlatform\Core\HttpCache\VarnishPurger" Line 70 :

yield $parts[0];

with:

yield array_shift($parts)

[julienfalque]

Woops, likely related to #3843, I'll have a look.

[julienfalque]

See #3894.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[julienfalque]

This issue can be closed as #3894 was merged.