From 2512256ac330271213783d4e937ff11dc4b01bfc Mon Sep 17 00:00:00 2001
From: fzaninotto <fzaninotto@gmail.com>
Date: Sun, 3 Jan 2021 16:26:11 +0100
Subject: [PATCH] Fix findDOMNode warning in StrictMode when using
 SimpleformIterator

Closes #5693
---
 packages/ra-ui-materialui/src/form/SimpleFormIterator.tsx | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/packages/ra-ui-materialui/src/form/SimpleFormIterator.tsx b/packages/ra-ui-materialui/src/form/SimpleFormIterator.tsx
index ce6991e27e2..0fb1f314a81 100644
--- a/packages/ra-ui-materialui/src/form/SimpleFormIterator.tsx
+++ b/packages/ra-ui-materialui/src/form/SimpleFormIterator.tsx
@@ -114,6 +114,7 @@ const SimpleFormIterator: FC<SimpleFormIteratorProps> = props => {
         defaultValue,
     } = props;
     const classes = useStyles(props);
+    const nodeRef = useRef(null);
 
     // We need a unique id for each field for a proper enter/exit animation
     // so we keep an internal map between the field position and an auto-increment id
@@ -184,6 +185,7 @@ const SimpleFormIterator: FC<SimpleFormIteratorProps> = props => {
             <TransitionGroup component={null}>
                 {fields.map((member, index) => (
                     <CSSTransition
+                        nodeRef={nodeRef}
                         key={ids.current[index]}
                         timeout={500}
                         classNames="fade"