建立DJANGO的自定义TAG-白红宇

DJANGO的TAG分为三类：

• simple_tag : Processes the data and returns a string

• inclusion_tag : Processes the data and returns a rendered template

• assignment_tag : Processes the data and sets a variable in the context

blog_tags.py

from django import templateregister = template.Library()from ..models import Postfrom django.db.models import Count@register.simple_tagdef total_posts():    return Post.published.count()@register.inclusion_tag('blog/post/latest_posts.html')def show_latest_posts(count=5):    latest_posts = Post.published.order_by('-publish')[:count]    return {
   'latest_posts': latest_posts}@register.assignment_tagdef get_most_commented_posts(count=5):    return Post.published.annotate(total_comments=Count('comments')).order_by('-total_comments')[:count]

latest_posts.html


     
          {% for post in latest_posts %}    
              {
   { post.title }}    
    {% endfor %}

base.html


             
      My blog
            
      This is my blog. I've written {% total_posts %} posts so far.
        
      Latest posts
        {% show_latest_posts 3 %}        
      Most commented post
        {% get_most_commented_posts as most_commented_posts%}        
      
                   {% for post in most_commented_posts %}            
                       {
   { post.title }}            
            {% endfor %}

无css层展示