~widelands-dev/widelands-website/remove_djangoratings

def get_real_ip(request):

    """Returns the real user IP, even if behind a proxy."""

    for key in ('HTTP_X_FORWARDED_FOR', 'REMOTE_ADDR'):

        if key in request.META:

            return request.META[key]

    # No match -> Return a fictional IP to have the model fields not empty

    return '192.168.255.255'

# AutoOneToOneField

# =================

# Initial implemenation details about AutoOneToOneField:

#   http://softwaremaniacs.org/blog/2007/03/07/auto-one-to-one-field/

#

from django.db.models.fields.related_descriptors import ReverseOneToOneDescriptor

from django.db.models import OneToOneField

from django.db import models

class AutoReverseOneToOneDescriptor(ReverseOneToOneDescriptor):

    """The descriptor that handles the object creation for an

    AutoOneToOneField."""

    def __get__(self, instance, instance_type=None):

        model = getattr(self.related, 'related_model', self.related.model)

        try:

            return (super(AutoReverseOneToOneDescriptor, self)

                    .__get__(instance, instance_type))

        except model.DoesNotExist:

            obj = model(**{self.related.field.name: instance})

            obj.save()

            # Don't return obj directly, otherwise it won't be added

            # to Django's cache, and the first 2 calls to obj.relobj

            # will return 2 different in-memory objects

            return (super(AutoReverseOneToOneDescriptor, self)

                    .__get__(instance, instance_type))

class AutoOneToOneField(OneToOneField):

    """OneToOneField creates dependent object on first request from parent

    object if dependent oject has not created yet."""

    def contribute_to_related_class(self, cls, related):

        setattr(cls, related.get_accessor_name(),

                AutoReverseOneToOneDescriptor(related))