From 13a6a8eb4bc04f85b5a92fa1a6243c6adfb73bd8 Mon Sep 17 00:00:00 2001
From: Javier Eguiluz <javier.eguiluz@gmail.com>
Date: Mon, 15 Apr 2019 16:38:34 +0200
Subject: [PATCH] Added a note about UniqueEntity and collections

---
 reference/constraints/UniqueEntity.rst | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/reference/constraints/UniqueEntity.rst b/reference/constraints/UniqueEntity.rst
index 11f783e5a66..1628d9997d6 100644
--- a/reference/constraints/UniqueEntity.rst
+++ b/reference/constraints/UniqueEntity.rst
@@ -114,6 +114,12 @@ your user table:
     this validation has passed and before this entity is actually persisted in
     the database.
 
+.. caution::
+
+    This constraint cannot deal with duplicates found in a collection of items
+    that haven't been persisted as entities yet. You'll need to create your own
+    validator to handle that case.
+
 Options
 -------