Add test for admin exclude fields #209

src/polymorphic/tests/admin.py

@@ -31,7 +31,11 @@ class Model2Admin(PolymorphicParentModelAdmin):
 
 admin_site.register(Model2B, PolymorphicChildModelAdmin)
 admin_site.register(Model2C, PolymorphicChildModelAdmin)
-admin_site.register(Model2D, PolymorphicChildModelAdmin)
+
+
+@register(Model2D)
+class Model2DAdmin(PolymorphicChildModelAdmin):
+    exclude = ("field3",)
 
 
 @register(PlainA)

src/polymorphic/tests/migrations/0001_initial.py

@@ -1,4 +1,4 @@
-# Generated by Django 4.2 on 2025-12-11 18:22
+# Generated by Django 4.2 on 2025-12-11 18:43
 
 from django.conf import settings
 from django.db import migrations, models
@@ -13,8 +13,8 @@ class Migration(migrations.Migration):
     initial = True
 
     dependencies = [
-        ('auth', '0012_alter_user_first_name_max_length'),
         ('contenttypes', '0002_remove_content_type_name'),
+        ('auth', '0012_alter_user_first_name_max_length'),
     ]
 
     operations = [
@@ -1179,7 +1179,7 @@ class Migration(migrations.Migration):
             name='Model2C',
             fields=[
                 ('model2b_ptr', models.OneToOneField(auto_created=True, on_delete=django.db.models.deletion.CASCADE, parent_link=True, primary_key=True, serialize=False, to='tests.model2b')),
-                ('field3', models.CharField(max_length=30)),
+                ('field3', models.CharField(blank=True, default='', max_length=30)),
             ],
             options={
                 'abstract': False,

src/polymorphic/tests/models.py

@@ -39,7 +39,7 @@ class Model2B(Model2A):
 
 
 class Model2C(Model2B):
-    field3 = models.CharField(max_length=30)
+    field3 = models.CharField(max_length=30, blank=True, default="")
 
 
 class Model2D(Model2C):

src/polymorphic/tests/test_admin.py

@@ -311,7 +311,7 @@ class PolymorphicFormTests(_GenericAdminFormTest):
                 {
                     "field1": "2D1",
                     "field2": "2D2",
-                    "field3": "2D3",
+                    # "field3": "2D3", excluded!
                     "field4": "2D4",
                 },
             ),
@@ -357,7 +357,7 @@ class PolymorphicFormTests(_GenericAdminFormTest):
 
         assert Model2D.objects.first().field1 == "2D1"
         assert Model2D.objects.first().field2 == "2D2"
-        assert Model2D.objects.first().field3 == "2D3"
+        assert Model2D.objects.first().field3 == ""
         assert Model2D.objects.first().field4 == "2D4"
 
 
@@ -397,7 +397,7 @@ class AdminRecentActionsTests(_GenericAdminFormTest):
                 {
                     "field1": "2D1",
                     "field2": "2D2",
-                    "field3": "2D3",
+                    # "field3": "2D3",  excluded!
                     "field4": "2D4",
                 },
             ),
@@ -449,14 +449,15 @@ class AdminRecentActionsTests(_GenericAdminFormTest):
 
                 assert values == ["2A1"]
             elif "model2d" in action_url:
+                # this also tests that exclusion of field3 works
                 inputs = self.page.locator("#model2d_form input[type='text']")
                 count = inputs.count()
-                assert count == 4
+                assert count == 3
 
                 values = []
                 for i in range(count):
                     values.append(inputs.nth(i).input_value())
 
-                assert values == ["2D1", "2D2", "2D3", "2D4"]
+                assert values == ["2D1", "2D2", "2D4"]
             else:
                 assert False, f"Unexpected change url: {action_url}"