django cms搜索多个站点？

HAYSTACK_SITECONF = \'mysite.search_sites\'

from cms.models import monkeypatch_reverse
import haystack

monkeypatch_reverse()
haystack.autodiscover()

from django.conf import settings
from django.utils.translation import string_concat, ugettext_lazy
from django.utils.html import strip_tags

from haystack import indexes, site

from cms.models.managers import PageManager
from cms.models.pagemodel import Page
from cms.models.pluginmodel import CMSPlugin

def page_index_factory(lang, lang_name):
    if isinstance(lang_name, basestring):
        lang_name = ugettext_lazy(lang_name)

    def get_absolute_url(self):
        if \'cms.middleware.multilingual.MultilingualURLMiddleware\' in settings.MIDDLEWARE_CLASSES:
            return \'/%s%s\' % (lang, Page.get_absolute_url(self))
        else:
            return Page.get_absolute_url(self)

    class Meta:
        proxy = True
        app_label = \'cms\'
        if len(settings.LANGUAGES) > 1:
            verbose_name = string_concat(Page._meta.verbose_name, \' (\', lang_name, \')\')
            verbose_name_plural = string_concat(Page._meta.verbose_name_plural, \' (\', lang_name, \')\')
        else:
            verbose_name = Page._meta.verbose_name
            verbose_name_plural = Page._meta.verbose_name_plural

    attrs = {\'__module__\': Page.__module__,
             \'Meta\': Meta,
             \'objects\': PageManager(),
             \'get_absolute_url\': get_absolute_url}

    _PageProxy = type(\"Page_%s\" % lang.title() , (Page,), attrs)

    _PageProxy._meta.parent_attr = \'parent\'
    _PageProxy._meta.left_attr = \'lft\'
    _PageProxy._meta.right_attr = \'rght\'
    _PageProxy._meta.tree_id_attr = \'tree_id\'

    class _PageIndex(indexes.SearchIndex):
        site_id = indexes.IntegerField(model_attr=\"site__id\")
        language = lang
        text = indexes.CharField(document=True, use_template=False)
        pub_date = indexes.DateTimeField(model_attr=\'publication_date\')
        login_required = indexes.BooleanField(model_attr=\'login_required\')
        url = indexes.CharField(stored=True, indexed=False, model_attr=\'get_absolute_url\')
        title = indexes.CharField(stored=True, indexed=False, model_attr=\'get_title\')

        def prepare(self, obj):
            self.prepared_data = super(_PageIndex, self).prepare(obj)
            plugins = CMSPlugin.objects.filter(language=lang, placeholder__in=obj.placeholders.all())
            text = \'\'
            for plugin in plugins:
                instance, _ = plugin.get_plugin_instance()
                if hasattr(instance, \'search_fields\'):
                    text += \'\'.join(strip_tags(getattr(instance, field, \'\')) for field in instance.search_fields)
                if getattr(instance, \'search_fulltext\', False):
                    text += strip_tags(instance.render_plugin())
            self.prepared_data[\'text\'] = text
            return self.prepared_data

        def index_queryset(self):
            qs = _PageProxy.objects.published().filter(title_set__language=lang).distinct()
            if \'publisher\' in settings.INSTALLED_APPS:
                qs = qs.filter(publisher_is_draft=True)
            return qs

    return _PageProxy, _PageIndex

for lang_tuple in settings.LANGUAGES:
    lang, lang_name = lang_tuple
    site.register(*page_index_factory(lang, lang_name))