PHPLIB-1167: Fix CachingIterator::count() on empty Cursor
#1118
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Fix error: Cannot advance a completed or failed cursor.
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alcaeus
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Jun 26, 2023
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* v1.16: PHPLIB-1167: Fix CachingIterator::count() on empty Cursor (mongodb#1118)
jmikola
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Jun 26, 2023
| @@ -152,6 +150,8 @@ private function exhaustIterator(): void | |||
| private function storeCurrentItem(): void | |||
| { | |||
| if (! $this->iterator->valid()) { | |||
| $this->iteratorExhausted = true; | |||
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I was looking at this last week but never submitted a review as I couldn't figure out a way to break the patch (^_^).
This addition struck me as a bit odd, since storeCurrentItem() now thinks about iteratorExhausted, but I suppose the alternative would have been copying
$this->iteratorExhausted = ! $this->iterator->valid();...into the constructor.
I'll assume it's OK as-is, since the regression test definitely covers the original bug.
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The private method could have been renamed.
In fact, this does 1 less call to $this->iterator->valid() at each next() call.
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Fix PHPLIB-1167 from #1097 (comment)
Previous error when calling
CachingIterator::count()on an empty Cursor (no result).After many tests, I have come to the conclusion that when
$iterator->valid()isfalseafter arewind(), it means that the$iteratoris empty. Therefore, we set the property$this->iteratorExhaustedtotrueso thenext()is not called.