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实现上一篇和下一篇

项目地址：https://github.com/ylpxzx/lifeblog

1. 视图中定义上一篇下一篇逻辑

class PostDetailView(DetailView):    model = Post    template_name = 'detail_post.html'    context_object_name = "post"    pk_url_kwarg = 'post_id'    def get_object(self, queryset=None):        obj = super(PostDetailView,self).get_object()        obj.total_views += 1        obj.save(update_fields=['total_views'])        return obj    def get_context_data(self, **kwargs):        kwargs['author_list'] = Blogger.objects.all()        kwargs['category_list'] = Category.objects.all().order_by('post_category')        kwargs['popular_post'] = Post.objects.all().order_by('-total_views')[:4]        content = super(PostDetailView, self).get_context_data(**kwargs)        num = content['post'].id        # 下一篇，找出id大于当前文章id的文章,升序排序后取第一个，即为下一篇        next_post = Post.objects.filter(id__gt=num).order_by("id")[:1]         if len(next_post) == 0:            content['next_post'] = 0        else:            for next in next_post:                content['next_post'] = next        # 上一篇，找出id小于当前文章id的文章，降序排序后取第一个，即为上一篇        prev_post = Post.objects.filter(id__lt=num).order_by("-id")[:1]         if len(prev_post) == 0:              content['prev_post'] = 0        else:            for prev in prev_post:                content['prev_post'] = prev        return content

2. 模板判断是否有上一篇和下一篇

{
   % if prev_post != 0 %}    
   
		
    
Prev Post
		
    
{
   {
    prev_post.title }}    
   
{
   % endif %}{
   % if next_post != 0 %}    
   
        
    
Next Post
        
    
{
   {
    next_post.title }}    
   
{
   % endif %}

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