关于使用django生成sitemap的问题

0 0

关于使用django生成sitemap的问题10

我的django的model使用了虚类生成的方法

class News(models.Model):
    title = models.CharField(max_length=100)
    content = models.TextField()
    news_type = models.ForeignKey(ContentType, blank=True, null=True, editable=False)
    pic_recommended = models.BooleanField()
    index_recommended = models.BooleanField()
    privilege = models.IntegerField()
    pub_time = models.DateTimeField()

    def __unicode__(self):
        return u'%s' % (self.title)
    
    def abstract_to_concrete(self):
        concrete = self.news_type.model_class().objects.get(pk=self.id)
        return concrete
    
    class Meta:
        ordering = ['-privilege','-pub_time']

然后由这个模型派生出单个的具体新闻类，如：

class Bulletin(News):
    def save(self, force_insert=False, force_update=False):
        self.news_type = ContentType.objects.get(model='Bulletin')
        super(Bulletin, self).save()

    def get_absolute_url(self):
        return '/bulletin/%s/' % self.id
    
    class Meta:
        verbose_name = u'公告栏'
        verbose_name_plural = u'公告栏'

class Knowledge(News):
    title_pic = models.ImageField(upload_to='knowledge/', null=True, blank=True)
    second_type = models.ForeignKey(SecondType)
    
    def save(self, force_insert=False, force_update=False):
        self.news_type = ContentType.objects.get(model='Knowledge')
        super(Knowledge, self).save()

    def get_absolute_url(self):
        return '/knowledge/%s/' % self.id
    
    class Meta:
        verbose_name = u'综合技术'
        verbose_name_plural = u'综合技术'

等等，为了使用django自带的sitemap生成机制，在url中这样写

from django.contrib.sitemaps import GenericSitemap 
from cmmb.news.models import *

info_dict = {
    'queryset': News.objects.all(),
    'pub_time': 'pub_time',
}

sitemaps = {
    'news': GenericSitemap(info_dict, priority=0.6),
}
urlpatterns=patterns(
    (r'^sitemap.xml$', 'django.contrib.sitemaps.views.sitemap', {'sitemaps': sitemaps}),
)

但是这样就出现了问题，因为News是个公共继承的父类，所以没有get_absolute_url的方法，而其他子类则没有pub_time的字段属性，无法生成sitemap，请问有什么好的解决方法么？？