From 33bfc66add643f49d466c5a646989ad91677753d Mon Sep 17 00:00:00 2001
From: Tim Graham <timograham@gmail.com>
Date: Sat, 4 Apr 2026 18:02:17 -0400
Subject: Fixed #37023 -- Made XML serializer put each ManyToManyField object
 on its own line.

---
 django/core/serializers/xml_serializer.py | 8 +++++++-
 tests/serializers/test_xml.py             | 5 ++++-
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/django/core/serializers/xml_serializer.py b/django/core/serializers/xml_serializer.py
index 82a345d57f..5dfbb76a01 100644
--- a/django/core/serializers/xml_serializer.py
+++ b/django/core/serializers/xml_serializer.py
@@ -199,6 +199,8 @@ class Serializer(base.Serializer):
             else:
 
                 def handle_m2m(value):
+                    # Put each object on its own line.
+                    self.indent(self.indent_level + 1)
                     self.xml.addQuickElement("object", attrs={"pk": str(value.pk)})
 
                 def queryset_iterator(obj, field):
@@ -217,9 +219,13 @@ class Serializer(base.Serializer):
                 field.name,
                 queryset_iterator(obj, field),
             )
+            relobj = None
             for relobj in m2m_iter:
                 handle_m2m(relobj)
-
+            if relobj:
+                # If there are related objects (which appear each on their own
+                # line), put the closing </field> on the next line.
+                self.indent(self.indent_level)
             self.xml.endElement("field")
             self.indent_level -= 1
 
diff --git a/tests/serializers/test_xml.py b/tests/serializers/test_xml.py
index 0ae66f77d0..884746dfac 100644
--- a/tests/serializers/test_xml.py
+++ b/tests/serializers/test_xml.py
@@ -24,7 +24,10 @@ class XmlSerializerTestCase(SerializersTestBase, TestCase):
     <field name="author" rel="ManyToOneRel" to="serializers.author">%(author_pk)s</field>
     <field name="headline" type="CharField">Poker has no place on ESPN</field>
     <field name="pub_date" type="DateTimeField">2006-06-16T11:00:00</field>
-    <field name="categories" rel="ManyToManyRel" to="serializers.category"><object pk="%(first_category_pk)s"></object><object pk="%(second_category_pk)s"></object></field>
+    <field name="categories" rel="ManyToManyRel" to="serializers.category">
+      <object pk="%(first_category_pk)s"></object>
+      <object pk="%(second_category_pk)s"></object>
+    </field>
     <field name="meta_data" rel="ManyToManyRel" to="serializers.categorymetadata"></field>
     <field name="topics" rel="ManyToManyRel" to="serializers.topic"></field>
   </object>
-- 
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