inclusion_tag module

inclusion_tag module

1. When a piece of content area of ​​the page to be presented for use on multiple pages, and the contents of the region need to pass parameters to display properly, then we can prioritize inclusion_tag modules:

Custom label filter inclusion_tag three-step strategy:

1. In the application must create a new folder named templatetags

2. py files in any folder under a new name

3. You must write two codes within the py file

from django.template import Library
register = Library

2. Let's look at an example of a BBS

from django.template import Library
from app01 import models
from django.db.models import Count
from django.db.models.functions import TruncMonth

register = Library()

@register.inclusion_tag('left_menu.html')
# 定义一个函数，接收一个username参数，(因为调用这个的时候需要传一个username参数)
def my_menu(username):
    user_obj = models.Userinfo.objects.filter(username=username).first()
    # 因为用户表与blog表示一对一的关系表所以可以通过下面的方法取值
    blog = user_obj.blog
    # 1.查询当前用户每一个分类及分类下的文章数
    category_list = models.Categroy.objects.filter(blog=blog).annotate(num=Count('article')).values_list('num', 'cate_name','pk')

    # 2.查询当前用户每一个标签及标签下的文章数
    tag_list = models.Tag.objects.filter(blog=blog).annotate(num=Count('article')).values_list('tag_name', 'num', 'pk')

    # 3.按年月分组
    data_list = models.Article.objects.filter(blog=blog).annotate(month=TruncMonth('create_time')).values('month').annotate(num=Count('pk')).values_list('month', 'num')
    return locals()