ldapts represents a missing/absent LDAP attribute as an empty array
([]), not undefined -- entry['mail'] is [] when an account has no mail
set. The field-mapping loop did Array.isArray(value) ? String(value[0])
: ..., and String(undefined) is the literal string "undefined". Every
synced entry without that attribute got mappedData['email'] = "undefined"
(a truthy string, so the `|| fallback` never kicked in), and the second
such entry onward crashed with a unique constraint violation on email
since they all shared the exact same literal string.
Found live: syncing against a real Zentyal/Samba AD directory failed
on every entry after the first (Kevin Schaller, krbtgt, Guest, the DC
computer object, etc.) with "Unique constraint failed on the fields:
(email)".
Fix: resolve array values to their first element (or use the raw
value for non-arrays) and only keep it when actually present and
non-empty, so a genuinely missing attribute falls through to the
`${username}@ldap.local` fallback instead of the string "undefined".
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
schalli
246dc89a98