https://bugzilla.wikimedia.org/show_bug.cgi?id=64306
Bug ID: 64306
Summary: IdGenerator should skip "used" IDs.
Product: MediaWiki extensions
Version: unspecified
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: Unprioritized
Component: WikidataRepo
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
Web browser: ---
Mobile Platform: ---
When generating the next ID for some kind of entity, IdGenerator should check
whether that supposedly new ID was already used after all, and discard it if
so. This process should be repeated a limited number of times, and an exception
raised of no unused ID could be found with some fixed number of tried.
An ID is considered "used" if an EntityTitleLookup returns a Title object for
that ID, and a call to exists() on that title returns true.
The rationale is that entities with IDs beyond the current counter may be
created on a wiki via importing. Checking whether the "next" ID was already
used prevents nasty conflicts and errors when such imported entities exist on a
wiki. The cost should be relatively low, since new IDs are not often needed,
checking is relatively cheap, and conflicts very rare.
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