Charles Bochet ee6fcdbec2 fix(front): show readable targets in morph relation picker (#21513)
## Problem

The **morph relation picker is broken** when the user does not have read
permission on *every* object a morph relation can point to.

A morph (polymorphic) relation can target several objects. The
single-record picker passed **all** of those target objects to the
`search` query via `includedObjectNameSingulars`. The backend runs the
per-object searches inside a single `Promise.all`, so if **one** target
object is forbidden, the whole search rejects and the picker shows **"No
records found"** — even for the target objects the user *can* read.

This makes the morph relation picker unusable in any workspace where a
role restricts read access to one of the morph targets (e.g. the demo
workspace's `Object-restricted` role, which denies reading `Rocket` —
the picker for a Pet's polymorphic owner then shows nothing, hiding the
readable `Survey result` records too).

## Fix

Filter the searched target objects down to the ones the current user is
allowed to read before querying, in
`useSingleRecordPickerPerformSearch`. This mirrors what the
multiple-record picker (`useMultipleRecordPickerPerformSearch`) already
does via `filteredSearchableObjectMetadataItems`.

For a normal (single-target) relation this is a no-op; for a morph
relation the picker now lists records from every target the user can
read and silently skips the forbidden ones.

## Test

Added `useSingleRecordPickerPerformSearch.test.tsx`:
- excludes morph target objects the user cannot read from the search
- keeps all targets when the user can read all of them

## Verification

Reproduced locally on a Pet's "Polymorphic Owner" morph relation
(targets `Rocket` + `Survey result`) with `Rocket` read denied:
- **Before:** picker shows "No records found".
- **After:** picker lists the readable `Survey result` records and omits
the `Rocket` ones.

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2026-06-12 23:28:50 +02:00
2026-06-11 11:02:28 +02:00

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