From daba3c04c0bcfa3101edbc10fd2c6ae881a4a4df Mon Sep 17 00:00:00 2001
From: Florian Sylvain <contact@floriansylvain.fr>
Date: Fri, 23 Oct 2026 00:48:10 +0200
Subject: [PATCH] fix: relation picker page size refused by entry list

---
 docs/release-notes.md                       |  1 +
 docs/releases/v3.5.1-beta.md                |  9 +++++++++
 web/src/lib/__tests__/relationField.spec.ts | 14 +++++++++++++-
 web/src/lib/relationField.ts                |  2 +-
 4 files changed, 24 insertions(+), 2 deletions(-)
 create mode 100644 docs/releases/v3.5.1-beta.md

diff --git a/docs/release-notes.md b/docs/release-notes.md
index 25c333f..4cced1c 100644
--- a/docs/release-notes.md
+++ b/docs/release-notes.md
@@ -44,3 +44,4 @@ Each body lives in `docs/releases/<tag>.md`. Publish with `tea releases create -
 | `v3.4.1-beta` | Media field and security updates |
 | `v3.4.2-beta` | Security and privacy hardening |
 | `v3.5.0-beta` | Relation field |
+| `v3.5.1-beta` | Relation picker fix |
diff --git a/docs/releases/v3.5.1-beta.md b/docs/releases/v3.5.1-beta.md
new file mode 100644
index 0000000..8e20ebf
--- /dev/null
+++ b/docs/releases/v3.5.1-beta.md
@@ -0,0 +1,9 @@
+This release fixes the Relation field picker, which could not load any entries.
+
+## Improvements and fixes
+
+- Choosing a target for a Relation field no longer fails with "Couldn't load" and a `400` error. The picker asked for pages of 10 entries, a size the entry list refuses, and now asks for 25.
+
+## Upgrading
+
+- Replace the binary, or pull the new image. No schema migration and no new environment variable.
diff --git a/web/src/lib/__tests__/relationField.spec.ts b/web/src/lib/__tests__/relationField.spec.ts
index dd69a14..70853e7 100644
--- a/web/src/lib/__tests__/relationField.spec.ts
+++ b/web/src/lib/__tests__/relationField.spec.ts
@@ -14,7 +14,13 @@ import { ruleMessage } from '@/lib/entryMessages'
 import { groupFields } from '@/lib/entryLayout'
 import { classifyRefusal, parseEntryRefusal } from '@/lib/entryServerError'
 import { FIELD_TYPES, fieldTypeSpec } from '@/lib/fieldTypes'
-import { isRelationId, relationIdsOf, summariesOf, type RelationSummary } from '@/lib/relationField'
+import {
+	RELATION_PAGE_SIZE,
+	isRelationId,
+	relationIdsOf,
+	summariesOf,
+	type RelationSummary,
+} from '@/lib/relationField'
 import { relationRowOf } from '@/lib/relationRows'
 import { ApiError } from '@/lib/apiError'
 import { diffFields } from '@/lib/schemaBuilderDiff'
@@ -481,3 +487,9 @@ describe('relation in the builder model', () => {
 		expect(data.speakers).toEqual([])
 	})
 })
+
+describe('the picker page size', () => {
+	it('is one of the sizes the entry list endpoint accepts', () => {
+		expect([5, 25, 50, 100]).toContain(RELATION_PAGE_SIZE)
+	})
+})
diff --git a/web/src/lib/relationField.ts b/web/src/lib/relationField.ts
index e048a83..6075a82 100644
--- a/web/src/lib/relationField.ts
+++ b/web/src/lib/relationField.ts
@@ -7,7 +7,7 @@ export type RelationKind = (typeof RELATION_KINDS)[number]
 
 export const DEFAULT_RELATION_KIND: RelationKind = 'one_to_many'
 export const RELATION_MAX = 50
-export const RELATION_PAGE_SIZE = 10
+export const RELATION_PAGE_SIZE = 25
 
 const RELATION_ID_MAX = 4294967295