[5.0.x] Fixed #35056 -- Fixed system check crash on reverse m2m relations with related_name in ModelAdmin.filter_horizontal/vertical.

Thanks Thomas Feldmann for the report.

Regression in 107865780aa44914e21d27fdf4ca269bc61c7f01.
Backport of 751d732a3815a68bdb5b7aceda0e7d5981362c4a from main

1 files changed, 36 insertions, 0 deletions

diff --git a/tests/modeladmin/test_checks.py b/tests/modeladmin/test_checks.py
index 2ed27f8a3d..85c175d581 100644
--- a/tests/modeladmin/test_checks.py
+++ b/tests/modeladmin/test_checks.py
@@ -323,6 +323,24 @@ class FilterVerticalCheckTests(CheckTestCase):
         )
 
     @isolate_apps("modeladmin")
+    def test_invalid_reverse_m2m_field_with_related_name(self):
+        class Contact(Model):
+            pass
+
+        class Customer(Model):
+            contacts = ManyToManyField("Contact", related_name="customers")
+
+        class TestModelAdmin(ModelAdmin):
+            filter_vertical = ["customers"]
+
+        self.assertIsInvalid(
+            TestModelAdmin,
+            Contact,
+            "The value of 'filter_vertical[0]' must be a many-to-many field.",
+            "admin.E020",
+        )
+
+    @isolate_apps("modeladmin")
     def test_invalid_m2m_field_with_through(self):
         class Artist(Model):
             bands = ManyToManyField("Band", through="BandArtist")
@@ -385,6 +403,24 @@ class FilterHorizontalCheckTests(CheckTestCase):
         )
 
     @isolate_apps("modeladmin")
+    def test_invalid_reverse_m2m_field_with_related_name(self):
+        class Contact(Model):
+            pass
+
+        class Customer(Model):
+            contacts = ManyToManyField("Contact", related_name="customers")
+
+        class TestModelAdmin(ModelAdmin):
+            filter_horizontal = ["customers"]
+
+        self.assertIsInvalid(
+            TestModelAdmin,
+            Contact,
+            "The value of 'filter_horizontal[0]' must be a many-to-many field.",
+            "admin.E020",
+        )
+
+    @isolate_apps("modeladmin")
     def test_invalid_m2m_field_with_through(self):
         class Artist(Model):
             bands = ManyToManyField("Band", through="BandArtist")