my blog has 5 kinds of post,3 have detail page and 2 with no detail page,I have to search previous and next post by post id ,if the previous doesn't have detail page,continue , here is my code:
class Post_detail_View(View):
def get(self,request,post_id):
try:
post = Post.objects.select_related('standardpost', 'quotepost', 'linkpost', 'audiopost', 'videopost').get(pk=post_id)
previous = self.get_previous(post_id)
next_post = self.get_next(post_id)
if post.type == 'standard':
content = markdown.markdown(post.standardpost.content, extensions=['markdown.extensions.extra',
'markdown.extensions.codehilite',
'markdown.extensions.toc', ])
return render_to_response('post-detail.html', locals())
elif post.type == 'audio':
content = markdown.markdown(post.audiopost.content, extensions=['markdown.extensions.extra',
'markdown.extensions.codehilite',
'markdown.extensions.toc', ])
return render_to_response('post-detail.html', locals())
elif post.type == 'video':
content = markdown.markdown(post.videopost.content, extensions=['markdown.extensions.extra',
'markdown.extensions.codehilite',
'markdown.extensions.toc', ])
return render_to_response('post-detail.html', locals())
except:
raise Http404
def get_previous(self,post_id):
post_id = int(post_id)
if post_id > 1:
try:
previous = Post.objects.select_related('standardpost', 'quotepost', 'linkpost', 'audiopost','videopost').get(pk=str(post_id - 1))
if previous.type == 'quote' or previous.type == 'link':
if post_id - 1 > 1:
self.get_previous(str(post_id - 1))
else:
return 0
else:
return previous
except:
return 0
else:
return 0
def get_next(self,post_id):
post_id = int(post_id)
try:
next_post = Post.objects.select_related('standardpost', 'quotepost', 'linkpost', 'audiopost','videopost').get(pk=str(post_id + 1))
if next_post.type == 'quote' or next_post.type == 'link':
self.get_next(str(post_id + 1))
else:
return next_post
except:
return 0
when I debug this previous = self.get_previous(post_id)
next_post = self.get_next(post_id)
after one or more recursion,before return,they both have objects to return,but they will become None after return,if directly return with no recursion ,it will be ok.
before return:
after return:
