from django.conf import settings

from django.core.exceptions import ObjectDoesNotExist, ImproperlyConfigured

from django.db import connection

from django.db.models.loading import get_apps, get_app, get_models, get_model, register_models

from django.db.models.query import Q

from django.db.models.expressions import F

from django.db.models.manager import Manager

from django.db.models.base import Model

from django.db.models.aggregates import *

from django.db.models.fields import *

from django.db.models.fields.subclassing import SubfieldBase

from django.db.models.fields.files import FileField, ImageField

from django.db.models.fields.related import ForeignKey, OneToOneField, ManyToManyField, ManyToOneRel, ManyToManyRel, OneToOneRel

from django.db.models import signals

# Admin stages.

ADD, CHANGE, BOTH = 1, 2, 3

def permalink(func):

    """

    Decorator that calls urlresolvers.reverse() to return a URL using

    parameters returned by the decorated function "func".

    "func" should be a function that returns a tuple in one of the

    following formats:

        (viewname, viewargs)

        (viewname, viewargs, viewkwargs)

    """

    from django.core.urlresolvers import reverse

    def inner(*args, **kwargs):

        bits = func(*args, **kwargs)

        return reverse(bits[0], None, *bits[1:3])

    return inner