Fixed #31007 -- Allowed specifying type of auto-created primary keys.

This also changes the default type of auto-created primary keys
for new apps and projects to BigAutoField.

2 files changed, 126 insertions, 0 deletions

diff --git a/tests/model_options/apps.py b/tests/model_options/apps.py
new file mode 100644
index 0000000000..be2250fe7a
--- /dev/null
+++ b/tests/model_options/apps.py
@@ -0,0 +1,25 @@
+from django.apps import AppConfig
+
+
+class ModelDefaultPKConfig(AppConfig):
+    name = 'model_options'
+
+
+class ModelPKConfig(AppConfig):
+    name = 'model_options'
+    default_auto_field = 'django.db.models.SmallAutoField'
+
+
+class ModelPKNonAutoConfig(AppConfig):
+    name = 'model_options'
+    default_auto_field = 'django.db.models.TextField'
+
+
+class ModelPKNoneConfig(AppConfig):
+    name = 'model_options'
+    default_auto_field = None
+
+
+class ModelPKNonexistentConfig(AppConfig):
+    name = 'model_options'
+    default_auto_field = 'django.db.models.NonexistentAutoField'
diff --git a/tests/model_options/test_default_pk.py b/tests/model_options/test_default_pk.py
new file mode 100644
index 0000000000..b678848916
--- /dev/null
+++ b/tests/model_options/test_default_pk.py
@@ -0,0 +1,101 @@
+from django.core.exceptions import ImproperlyConfigured
+from django.db import models
+from django.test import SimpleTestCase, override_settings
+from django.test.utils import isolate_apps
+
+
+@isolate_apps('model_options')
+class TestDefaultPK(SimpleTestCase):
+    @override_settings(DEFAULT_AUTO_FIELD='django.db.models.NonexistentAutoField')
+    def test_default_auto_field_setting_nonexistent(self):
+        msg = (
+            "DEFAULT_AUTO_FIELD refers to the module "
+            "'django.db.models.NonexistentAutoField' that could not be "
+            "imported."
+        )
+        with self.assertRaisesMessage(ImproperlyConfigured, msg):
+            class Model(models.Model):
+                pass
+
+    @isolate_apps('model_options.apps.ModelPKNonexistentConfig')
+    def test_app_default_auto_field_nonexistent(self):
+        msg = (
+            "model_options.apps.ModelPKNonexistentConfig.default_auto_field "
+            "refers to the module 'django.db.models.NonexistentAutoField' "
+            "that could not be imported."
+        )
+        with self.assertRaisesMessage(ImproperlyConfigured, msg):
+            class Model(models.Model):
+                pass
+
+    @override_settings(DEFAULT_AUTO_FIELD='django.db.models.TextField')
+    def test_default_auto_field_setting_non_auto(self):
+        msg = (
+            "Primary key 'django.db.models.TextField' referred by "
+            "DEFAULT_AUTO_FIELD must subclass AutoField."
+        )
+        with self.assertRaisesMessage(ValueError, msg):
+            class Model(models.Model):
+                pass
+
+    @isolate_apps('model_options.apps.ModelPKNonAutoConfig')
+    def test_app_default_auto_field_non_auto(self):
+        msg = (
+            "Primary key 'django.db.models.TextField' referred by "
+            "model_options.apps.ModelPKNonAutoConfig.default_auto_field must "
+            "subclass AutoField."
+        )
+        with self.assertRaisesMessage(ValueError, msg):
+            class Model(models.Model):
+                pass
+
+    @override_settings(DEFAULT_AUTO_FIELD=None)
+    def test_default_auto_field_setting_none(self):
+        msg = 'DEFAULT_AUTO_FIELD must not be empty.'
+        with self.assertRaisesMessage(ImproperlyConfigured, msg):
+            class Model(models.Model):
+                pass
+
+    @isolate_apps('model_options.apps.ModelPKNoneConfig')
+    def test_app_default_auto_field_none(self):
+        msg = (
+            'model_options.apps.ModelPKNoneConfig.default_auto_field must not '
+            'be empty.'
+        )
+        with self.assertRaisesMessage(ImproperlyConfigured, msg):
+            class Model(models.Model):
+                pass
+
+    @isolate_apps('model_options.apps.ModelDefaultPKConfig')
+    @override_settings(DEFAULT_AUTO_FIELD='django.db.models.SmallAutoField')
+    def test_default_auto_field_setting(self):
+        class Model(models.Model):
+            pass
+
+        self.assertIsInstance(Model._meta.pk, models.SmallAutoField)
+
+    @isolate_apps('model_options.apps.ModelPKConfig')
+    @override_settings(DEFAULT_AUTO_FIELD='django.db.models.AutoField')
+    def test_app_default_auto_field(self):
+        class Model(models.Model):
+            pass
+
+        self.assertIsInstance(Model._meta.pk, models.SmallAutoField)
+
+    @isolate_apps('model_options.apps.ModelDefaultPKConfig')
+    @override_settings(DEFAULT_AUTO_FIELD='django.db.models.SmallAutoField')
+    def test_m2m_default_auto_field_setting(self):
+        class M2MModel(models.Model):
+            m2m = models.ManyToManyField('self')
+
+        m2m_pk = M2MModel._meta.get_field('m2m').remote_field.through._meta.pk
+        self.assertIsInstance(m2m_pk, models.SmallAutoField)
+
+    @isolate_apps('model_options.apps.ModelPKConfig')
+    @override_settings(DEFAULT_AUTO_FIELD='django.db.models.AutoField')
+    def test_m2m_app_default_auto_field(self):
+        class M2MModel(models.Model):
+            m2m = models.ManyToManyField('self')
+
+        m2m_pk = M2MModel._meta.get_field('m2m').remote_field.through._meta.pk
+        self.assertIsInstance(m2m_pk, models.SmallAutoField)