From af3cfc863095e70f752c6b1875ed5c5dbaac2c4a Mon Sep 17 00:00:00 2001
From: James Gillard <jamesgillard@live.co.uk>
Date: Sat, 10 Dec 2022 15:46:23 +0000
Subject: [4.1.x] Fixed #34205 -- Fixed Meta.constraints validation crash with
 ArrayField and __len lookup.

Regression in 88fc9e2826044110b7b22577a227f122fe9c1fb5 that began
manifesting in Django 4.1.

Backport of c5ed884eabf3b2b67581c55bf6c87e721f69157f from main.
---
 django/contrib/postgres/fields/array.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'django/contrib/postgres/fields/array.py')

diff --git a/django/contrib/postgres/fields/array.py b/django/contrib/postgres/fields/array.py
index 7269198674..97c6515d95 100644
--- a/django/contrib/postgres/fields/array.py
+++ b/django/contrib/postgres/fields/array.py
@@ -265,7 +265,7 @@ class ArrayLenTransform(Transform):
         return (
             "CASE WHEN %(lhs)s IS NULL THEN NULL ELSE "
             "coalesce(array_length(%(lhs)s, 1), 0) END"
-        ) % {"lhs": lhs}, params
+        ) % {"lhs": lhs}, params * 2
 
 
 @ArrayField.register_lookup
-- 
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