CommunityConfiguration nested arrays don't use valid message keys, breaking support for them
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	STran
	Apr 17 2026, 11:00 AM

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	Apr 17 2026, 11:00 AM

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Description

Reproduction steps

Use the following configuration schema:

	public const CCExample_Pages = [
	/	/ Copy-pasted from the root example
		self::TYPE => self::TYPE_OBJECT,
		self::PROPERTIES => [
			'NestedPage' => [
				self::TYPE => self::TYPE_ARRAY,
				self::DEFAULT => [],
				self::ITEMS => [
					self::TYPE => self::TYPE_OBJECT,
					self::PROPERTIES => [
						'title' => [
							self::REF => [
								'class' => MediaWikiDefinitions::class,
								'field' => 'PageTitle',
							],
							// TODO: this does not work!
							self::MIN_LENGTH => 1,
						],
					],
					self::REQUIRED => [ 'title' ],
				],
			]
		],
	];

No messages show up when an item is added:

Expected Behavior

Arrays should use valid message keys like when they're in the root:

Event Timeline

STran created this task.Apr 17 2026, 11:00 AM

Restricted Application added a subscriber: Aklapper. · View Herald TranscriptApr 17 2026, 11:00 AM

I noodled around for a bit but am not sure if this is user error or if something is happening in the config passthrough. Checking the i18nMessages generated in GenericFormEditorCapability, I see that it's expecting communityconfiguration-communityconfigurationexample-ccexample_pages-nestedpage-item-label but when the js tries to render it, it outputs communityconfiguration-communityconfigurationexample-nestedpage-item-label which fails the null check for the message and therefore never shows up.

I think (?) I narrowed it down to whatever's being passed through to useJsonFormArrayControl. Investigating the i18nPrefix passed through to buildUISubSchema, I see communityconfiguration-communityconfigurationexample instead of the expected communityconfiguration-communityconfigurationexample-CCExample_Pages even though the scope is still CCExample_Pages_NestedPage #/properties/CCExample_Pages/properties/CCExample_Pages_NestedPage.

Thanks for the report, @STran! At first sight, this looks indeed unexpected. I'm curious, is this blocking your team from using CommunityConfiguration for something? This would help us with prioritizing this accordingly.

(I'm also CCing @Sgs, the primary author of the form editor, for thoughts)

CC @KStoller-WMF for awareness

Urbanecm_WMF moved this task from Inbox to Needs Discussion on the Growth-Team board.Apr 20 2026, 3:02 PM

DMburugu moved this task from Needs Discussion to Triaged on the Growth-Team board.Jun 29 2026, 10:23 AM

CommunityConfiguration nested arrays don't use valid message keys, breaking support for themOpen, Needs TriagePublicActions

Description

Event Timeline

CommunityConfiguration nested arrays don't use valid message keys, breaking support for them
Open, Needs TriagePublic
Actions