https://bugzilla.wikimedia.org/show_bug.cgi?id=57259
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Bug ID: 57259
Summary: No proper handling of multivalued fileds
Product: MediaWiki extensions
Version: unspecified
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: Unprioritized
Component: CommonsMetadata
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected]
Classification: Unclassified
Mobile Platform: ---
Fields can have multiple values, in several different ways:
* some file metadata (EXIF etc) fields can have multiple values
* we parse some data from HTML code of license templates; some images have
multiple license templates
* sometimes the same property can have a value from both the file and the
description
* categories, and any properties based on categories, are in many-to-many
relation with images
* (there are also multi-languaged values which can be multivalued when all
languages are requested, but we already deal with that)
Right now we handle this in a very hacky way for some fields (e.g. concatenate
categories with "|") and don't handle it at all for most (one of the values is
selected by some random aspect of the code). This will be especially
problematic if we want to use CommonsMetadata as a helper tool for the Wikidata
migration.
A proper multivalue handling should probably be able to:
* indicate whether or not the given field is multivalued
* indicate the source (e.g. if one of the values comes from the file, the other
from the description, we should be able to somehow tell that)
* synchronize properties somehow (e.g. a multilicensed image will have multiple
license names and multiple license URLs; the user of the API has to be able to
match the right name to the right link)
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