Fixed #7913 -- Corrected backwards incompatible parts of [7977] when optgroup handling was added to field choices (Ticket #4412). Thanks to Michael Elsdorfer (miracle2k) for the report and patch.

git-svn-id: http://code.djangoproject.com/svn/django/trunk@8102 bcc190cf-cafb-0310-a4f2-bffc1f526a37

tests/regressiontests/model_fields/models.py

@@ -11,6 +11,22 @@ class Bar(models.Model):
     b = models.CharField(max_length=10)
     a = models.ForeignKey(Foo, default=get_foo)
 
+class Whiz(models.Model):
+    CHOICES = (
+        ('Group 1', (
+                (1,'First'),
+                (2,'Second'),
+            )
+        ),
+        ('Group 2', (
+                (3,'Third'),
+                (4,'Fourth'),
+            )
+        ),        
+        (0,'Other'),
+    )
+    c = models.IntegerField(choices=CHOICES, null=True)
+    
 __test__ = {'API_TESTS':"""
 # Create a couple of Places.
 >>> f = Foo.objects.create(a='abc')
@@ -21,4 +37,39 @@ __test__ = {'API_TESTS':"""
 <Foo: Foo object>
 >>> b.save()
 
+# Regression tests for #7913
+# Check that get_choices and get_flatchoices interact with
+# get_FIELD_display to return the expected values.
+
+# Test a nested value
+>>> w = Whiz(c=1)
+>>> w.save()
+>>> w.get_c_display()
+u'First'
+
+# Test a top level value
+>>> w.c = 0
+>>> w.save()
+>>> w.get_c_display()
+u'Other'
+
+# Test an invalid data value
+>>> w.c = 9
+>>> w.save()
+>>> w.get_c_display()
+9
+
+# Test a blank data value
+>>> w.c = None
+>>> w.save()
+>>> print w.get_c_display()
+None
+
+# Test an empty data value
+>>> w.c = ''
+>>> w.save()
+>>> w.get_c_display()
+u''
+
+
 """}