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

                         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

                    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:

                                            (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()

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

>>> 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")

"""}