class SingleObjectMixin

def get_context_data(self, **kwargs):
    context = kwargs
    context_object_name = self.get_context_object_name(self.object)
    if context_object_name:
        context[context_object_name] = self.object
    return context

def get_context_object_name(self, obj):
    """
    Get the name to use for the object.
    """
    if self.context_object_name:
        return self.context_object_name
    elif hasattr(obj, '_meta'):
        return smart_str(obj._meta.object_name.lower())
    else:
        return None

def get_object(self, queryset=None):
    """
    Returns the object the view is displaying.
    By default this requires `self.queryset` and a `pk` or `slug` argument
    in the URLconf, but subclasses can override this to return any object.
    """
    # Use a custom queryset if provided; this is required for subclasses
    # like DateDetailView
    if queryset is None:
        queryset = self.get_queryset()
    # Next, try looking up by primary key.
    pk = self.kwargs.get(self.pk_url_kwarg, None)
    slug = self.kwargs.get(self.slug_url_kwarg, None)
    if pk is not None:
        queryset = queryset.filter(pk=pk)
    # Next, try looking up by slug.
    elif slug is not None:
        slug_field = self.get_slug_field()
        queryset = queryset.filter(**{slug_field: slug})
    # If none of those are defined, it's an error.
    else:
        raise AttributeError(u"Generic detail view %s must be called with "
                             u"either an object pk or a slug."
                             % self.__class__.__name__)
    try:
        obj = queryset.get()
    except ObjectDoesNotExist:
        raise Http404(_(u"No %(verbose_name)s found matching the query") %
                      {'verbose_name': queryset.model._meta.verbose_name})
    return obj

def get_queryset(self):
    """
    Get the queryset to look an object up against. May not be called if
    `get_object` is overridden.
    """
    if self.queryset is None:
        if self.model:
            return self.model._default_manager.all()
        else:
            raise ImproperlyConfigured(u"%(cls)s is missing a queryset. Define "
                                       u"%(cls)s.model, %(cls)s.queryset, or override "
                                       u"%(cls)s.get_object()." % {
                                            'cls': self.__class__.__name__
                                    })
    return self.queryset._clone()

def get_slug_field(self):
    """
    Get the name of a slug field to be used to look up by slug.
    """
    return self.slug_field