Ticket #17143: 17143_test.diff

new file tests/modeltests/test_17143/models.py

@@ +1 @@
+# coding: utf-8
+"""
+1. Bare-bones model
+
+This is a basic model with only two non-primary-key fields.
+"""
+from django.db import models
+
+
+init_effect = []
+
+
+class A(models.Model):
+    foo = models.CharField(max_length=1, default='N')
+    
+    def __init__(self, *args, **kwargs):
+        super(A, self).__init__(*args, **kwargs)
+        
+        init_effect.append(self.foo)
+    
+class B(A):
+    bar = models.CharField(max_length=1, default='X')

new file tests/modeltests/test_17143/tests.py

@@ +1 @@
+from __future__ import absolute_import
+
+from datetime import datetime
+
+from django.core.exceptions import ObjectDoesNotExist
+from django.db.models.fields import FieldDoesNotExist
+from django.test import TestCase, skipIfDBFeature, skipUnlessDBFeature
+
+from .models import A, B, init_effect
+
+
+class ModelTest(TestCase):
+
+    def setUp(self):
+        self.b = B.objects.create(foo='Y', bar='Z')
+
+    def tearDown(self):
+        init_effect[:] = []
+
+    def test_17143_1(self):
+        self.assertEqual(init_effect, ['Y'])
+
+    def test_17143_2(self):
+        a = A.objects.get()
+        self.assertEqual(init_effect, ['Y'] * 2)
+
+    def test_17143_3(self):
+        b = B.objects.get()
+        self.assertEqual(init_effect, ['Y'] * 2)
+
+    def test_17143_4(self):
+        a = A.objects.get()
+        b = a.b
+        self.assertEqual(b.foo, a.foo)
+        self.assertEqual(init_effect, ['Y'] * 3)
+
+    def test_17143_5(self):
+        (a,) = A.objects.select_related('b')
+        self.assertEqual(a.id, self.b.id)
+        self.assertEqual(a.b.foo, 'Y')
+        self.assertEqual(init_effect, ['Y'] * 3)