Fixed #7588 -- Inherit fields from concrete ancestor classes via abstract base

classes. Based on a patch from emulbreh.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@8932 bcc190cf-cafb-0310-a4f2-bffc1f526a37

django/db/models/base.py

@@ -94,8 +94,8 @@ class ModelBase(type):
                          new_class._meta.virtual_fields
             field_names = set([f.name for f in new_fields])
 
-            # Concrete classes...
             if not base._meta.abstract:
+                # Concrete classes...
                 if base in o2o_map:
                     field = o2o_map[base]
                     field.primary_key = True
@@ -107,9 +107,11 @@ class ModelBase(type):
                     new_class.add_to_class(attr_name, field)
                 new_class._meta.parents[base] = field
 
-            # .. and abstract ones.
             else:
-                # Check for clashes between locally declared fields and those on the ABC.
+                # .. and abstract ones.
+
+                # Check for clashes between locally declared fields and those
+                # on the ABC.
                 parent_fields = base._meta.local_fields + base._meta.local_many_to_many
                 for field in parent_fields:
                     if field.name in field_names:
@@ -119,6 +121,9 @@ class ModelBase(type):
                                             (field.name, name, base.__name__))
                     new_class.add_to_class(field.name, copy.deepcopy(field))
 
+                # Pass any non-abstract parent classes onto child.
+                new_class._meta.parents.update(base._meta.parents)
+
             # Inherit managers from the abstract base classes.
             base_managers = base._meta.abstract_managers
             base_managers.sort()

tests/regressiontests/model_inheritance_regress/models.py

@@ -77,6 +77,16 @@ class M2MBase(models.Model):
 class M2MChild(M2MBase):
     name = models.CharField(max_length=50)
 
+class Evaluation(Article):
+    quality = models.IntegerField()
+
+    class Meta:
+        abstract = True
+
+class QualityControl(Evaluation):
+    assignee = models.CharField(max_length=50)
+
+
 __test__ = {'API_TESTS':"""
 # Regression for #7350, #7202
 # Check that when you create a Parent object with a specific reference to an
@@ -242,4 +252,9 @@ DoesNotExist: ArticleWithAuthor matching query does not exist.
 >>> M2MChild.objects.filter(articles__isnull=False)
 []
 
+# All fields from an ABC, including those inherited non-abstractly should be
+# available on child classes (#7588). Creating this instance should work
+# without error.
+>>> _ = QualityControl.objects.create(headline="Problems in Django", pub_date=datetime.datetime.now(), quality=10, assignee="adrian")
+
 """}