Last modified: 2014-06-09 12:51:37 UTC

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Bug 63595 - Merging items with same referenced claim is not possible


Summary:	Merging items with same referenced claim is not possible

Status:	NEW

Product:	MediaWiki extensions
Classification:	Unclassified
Component:	WikidataClient (Other open bugs)
Version:	unspecified
Hardware:	All All

Importance:	High major (vote)
Target Milestone:	---
Assigned To:	Wikidata bugs

URL:
Whiteboard:	u=dev c=backend p=5
Keywords:	need-volunteer, testme

Depends on:
Blocks:
	Show dependency tree / graph

Reported:	2014-04-06 15:44 UTC by Matěj Suchánek
Modified:	2014-06-09 12:51 UTC (History)
CC List:	6 users (show)

See Also:
Web browser:	---
Mobile Platform:	---
Assignee Huggle Beta Tester:	---

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Description Matěj Suchánek 2014-04-06 15:44:26 UTC

This bug is similar to 63278. When I try to merge two items which have same claim, and this claim is same referenced, I get this error message: "Exception while applying changes: Claim has already a reference with hash 7eb64cf9621d34c54fd4bd040ed".

Why is it a problem to merge items having a same referenced claim?

Example: [[d:Q8262804]], [[d:Q15403782]]

Comment 1 Addshore 2014-04-07 22:21:50 UTC

https://github.com/wikimedia/mediawiki-extensions-Wikibase/blob/master/repo/includes/ChangeOp/ChangeOpsMerge.php#L183

generateClaimsChangeOps() simply needs to make sure a claim / statement with the same hash doesn't already exist on the item.
If it does exist then don't bother adding the claim to the new item!

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