[1.7.x] Fixed #23539 -- Added get_extra(), get_max_num(), and get_min_num() hooks to GenericInlineModelAdmin.

Backport of cf43a1ee90 from master

django/contrib/contenttypes/admin.py

@@ -115,12 +115,12 @@ class GenericInlineModelAdmin(InlineModelAdmin):
             "form": self.form,
             "formfield_callback": partial(self.formfield_for_dbfield, request=request),
             "formset": self.formset,
-            "extra": self.extra,
+            "extra": self.get_extra(request, obj),
             "can_delete": can_delete,
             "can_order": False,
             "fields": fields,
-            "min_num": self.min_num,
-            "max_num": self.max_num,
+            "min_num": self.get_min_num(request, obj),
+            "max_num": self.get_max_num(request, obj),
             "exclude": exclude
         }
         defaults.update(kwargs)

docs/releases/1.7.1.txt

@@ -61,3 +61,9 @@ Bugfixes
 
 * Fixed renaming of models with a self-referential many-to-many field
   (``ManyToManyField('self')``) (:ticket:`23503`).
+
+* Added the :meth:`~django.contrib.admin.InlineModelAdmin.get_extra()`,
+  :meth:`~django.contrib.admin.InlineModelAdmin.get_max_num()`, and
+  :meth:`~django.contrib.admin.InlineModelAdmin.get_min_num()` hooks to
+  :class:`~django.contrib.contenttypes.admin.GenericInlineModelAdmin`
+  (:ticket:`23539`).

tests/generic_inline_admin/tests.py

@@ -221,6 +221,63 @@ class GenericInlineAdminParametersTest(TestCase):
         self.assertEqual(formset.total_form_count(), 5)
         self.assertEqual(formset.initial_form_count(), 1)
 
+    def test_get_extra(self):
+
+        class GetExtraInline(GenericTabularInline):
+            model = Media
+            extra = 4
+
+            def get_extra(self, request, obj):
+                return 2
+
+        modeladmin = admin.ModelAdmin(Episode, admin_site)
+        modeladmin.inlines = [GetExtraInline]
+        e = self._create_object(Episode)
+        request = self.factory.get('/generic_inline_admin/admin/generic_inline_admin/episode/%s/' % e.pk)
+        request.user = User(username='super', is_superuser=True)
+        response = modeladmin.changeform_view(request, object_id=str(e.pk))
+        formset = response.context_data['inline_admin_formsets'][0].formset
+
+        self.assertEqual(formset.extra, 2)
+
+    def test_get_min_num(self):
+
+        class GetMinNumInline(GenericTabularInline):
+            model = Media
+            min_num = 5
+
+            def get_min_num(self, request, obj):
+                return 2
+
+        modeladmin = admin.ModelAdmin(Episode, admin_site)
+        modeladmin.inlines = [GetMinNumInline]
+        e = self._create_object(Episode)
+        request = self.factory.get('/generic_inline_admin/admin/generic_inline_admin/episode/%s/' % e.pk)
+        request.user = User(username='super', is_superuser=True)
+        response = modeladmin.changeform_view(request, object_id=str(e.pk))
+        formset = response.context_data['inline_admin_formsets'][0].formset
+
+        self.assertEqual(formset.min_num, 2)
+
+    def test_get_max_num(self):
+
+        class GetMaxNumInline(GenericTabularInline):
+            model = Media
+            extra = 5
+
+            def get_max_num(self, request, obj):
+                return 2
+
+        modeladmin = admin.ModelAdmin(Episode, admin_site)
+        modeladmin.inlines = [GetMaxNumInline]
+        e = self._create_object(Episode)
+        request = self.factory.get('/generic_inline_admin/admin/generic_inline_admin/episode/%s/' % e.pk)
+        request.user = User(username='super', is_superuser=True)
+        response = modeladmin.changeform_view(request, object_id=str(e.pk))
+        formset = response.context_data['inline_admin_formsets'][0].formset
+
+        self.assertEqual(formset.max_num, 2)
+
 
 @override_settings(PASSWORD_HASHERS=('django.contrib.auth.hashers.SHA1PasswordHasher',))
 class GenericInlineAdminWithUniqueTogetherTest(TestCase):