Fixed #7918 -- Allow the foreign key in an inline to be any where in the...

            fk = fks_to_parent[0]

            if not isinstance(fk, ForeignKey) or \

                    (fk.rel.to != parent_model and

                     fk.rel.to not in parent_model._meta.parents.keys()):

                     fk.rel.to not in parent_model._meta.get_parent_list()):

                raise Exception("fk_name '%s' is not a ForeignKey to %s" % (fk_name, parent_model))

        elif len(fks_to_parent) == 0:

            raise Exception("%s has no field named '%s'" % (model, fk_name))

            f for f in opts.fields

            if isinstance(f, ForeignKey)

            and (f.rel.to == parent_model

                or f.rel.to in parent_model._meta.parents.keys())

                or f.rel.to in parent_model._meta.get_parent_list())

        ]

        if len(fks_to_parent) == 1:

            fk = fks_to_parent[0]

    some_field = models.CharField(max_length=100)

# models for inheritance tests.

class Place(models.Model):

    name = models.CharField(max_length=50)

    city = models.CharField(max_length=50)

    def __unicode__(self):

        return self.name

class Owner(models.Model):

    name = models.CharField(max_length=100)

    place = models.ForeignKey(Place)

class Restaurant(Place):

    serves_pizza = models.BooleanField()

    def __unicode__(self):

        return self.name

class MexicanRestaurant(Restaurant):

    serves_tacos = models.BooleanField()

__test__ = {'API_TESTS': """

>>> from datetime import date

<p><label for="id_form-0-my_pk">My pk:</label> <input id="id_form-0-my_pk" type="text" name="form-0-my_pk" maxlength="10" /></p>

<p><label for="id_form-0-some_field">Some field:</label> <input id="id_form-0-some_field" type="text" name="form-0-some_field" maxlength="100" /></p>

# Foreign keys in parents ########################################

>>> from django.forms.models import _get_foreign_key

>>> type(_get_foreign_key(Restaurant, Owner))

<class 'django.db.models.fields.related.ForeignKey'>

>>> type(_get_foreign_key(MexicanRestaurant, Owner))

<class 'django.db.models.fields.related.ForeignKey'>

"""}