Fixed deferred loading of fields with default values.

        for field in fields_iter:

            is_related_object = False

            if kwargs:

            # This slightly odd construct is so that we can access any

                # data-descriptor object (DeferredAttribute) without triggering

                # its __get__ method.

            # data-descriptor object (DeferredAttribute) without triggering its

            # __get__ method.

            if (field.attname not in kwargs and

                    isinstance(self.__class__.__dict__.get(field.attname), DeferredAttribute)):

                # This field will be populated on request.

                continue

            if kwargs:

                if isinstance(field.rel, ManyToOneRel):

                    try:

                        # Assume object instance was passed in.

"""

Regression tests for defer() / only() behavior.

"""

from django.conf import settings

from django.db import connection, models

class Item(models.Model):

    name = models.CharField(max_length=10)

    text = models.TextField(default="xyzzy")

    value = models.IntegerField()

    other_value = models.IntegerField(default=0)

    def __unicode__(self):

        return self.name

__test__ = {"regression_tests": """

Deferred fields should really be deferred and not accidentally use the field's

default value just because they aren't passed to __init__.

>>> settings.DEBUG = True

>>> _ = Item.objects.create(name="first", value=42)

>>> obj = Item.objects.only("name", "other_value").get(name="first")

# Accessing "name" doesn't trigger a new database query. Accessing "value" or

# "text" should.

>>> num = len(connection.queries)

>>> obj.name

u"first"

>>> obj.other_value

0

>>> len(connection.queries) == num

True

>>> obj.value

42

>>> len(connection.queries) == num + 1      # Effect of values lookup.

True

>>> obj.text

u"xyzzy"

>>> len(connection.queries) == num + 2      # Effect of text lookup.

True

>>> settings.DEBUG = False

"""

}