https://bugzilla.wikimedia.org/show_bug.cgi?id=43734
Web browser: ---
Bug ID: 43734
Summary: "soft" uniqueness checks must only be performed on
item creation.
Product: MediaWiki extensions
Version: unspecified
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: Unprioritized
Component: WikidataRepo
Assignee: wikidata-b...@lists.wikimedia.org
Reporter: daniel.kinz...@wikimedia.de
CC: wikibugs-l@lists.wikimedia.org,
wikidata-b...@lists.wikimedia.org
Classification: Unclassified
Mobile Platform: ---
Soft constraints (those that allow false negatives for technical/performance
reasons) must only be applied on item creation. One example is the constraint
that an item's combination of label and description must be unique for any
given language. We check this, but can not (efficiently) do this with 100%
accuracy.
The effect is that two items with the same label/description/language
combination may exist in the database. These conflicting items can then no
longer be modified (except by resolving the conflict), because any attempt to
save them would fail due to the uniqueness constraint (and currently without an
error message, see bug 43720).
The main use of this constraint is to keep people from creating a data item
about some concept that already has an item. Applying the uniqueness check when
creating the item, and refusing the create the item if there already is one
with the same label/description/language, would solve that problem, but would
still allow conflicting items to be edited later.
It however also allows conflicts to be introduced by editing existing items. A
special page for listing such conflicting items could be a solution.
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