将两个查询集合到一个模板标签中 [英] Combining two queryset into a template tag

问题描述

我有两个模型news.article和portfolio.entry。两个模型都有一个BooleanField，用于将is_campaign设置为true。

我试图编写一个自定义模板，以便我可以获得最新的广告系列文章（应该只有一个）

这是我的模板标签：campaign_article.py

  from itertools import chain 
 from django import template 
 
 from news.models import文章
 from portfolio.models import Entry 
 
 register = template.Library（）
 
 def get_campaign（）：
＃通过is_campaign = True 
获取最新的新闻文章article = Article.objects.filter（is_campaign = True）.order_by（' -  pub_date'）[ ：1] 
 
＃获取最新的投资组合条目，其中is_campaign = True 
 portfolio = Portfolio_entry.objects.filter（is_campaign = True）.order_by（' -  pub_date'）[：1] 
 
 #combine文章，并输入并显示最新的
 campaign_article = list（chain（article，portfolio））[：1] 
 
 
返回{'campaign_article'：campaign_article} 
 
 
 
 register.tag（'campaign'，get_campaign）
  

我在我的模板中尝试过：

  {％load campaign_article％ } 
 {％for campaign_article in campaign％} 
 
 {{campaign_article.id}} 
 
 {％endfor％} 
  

但是我没有任何输出。这是错误的方法吗？

解决方案

您将要创建 assignment_tag ，而不是通用标签。
所以你可以更新您的标签：

  def get_campaign（）：
＃你的东西
 .... 
 
 return campaign_article 
 
 register.assignment_tag（get_campaign，name ='campaign'）
  

并更新模板为：

  {％load campaign_article％} 
 {％campaign as campaign_list％} {＃加载标签并创建campaign_list上下文变量＃} 
 {％for campaign_article in campaign_list％} 
 {{campaign_article.id}} 
 {％endfor％} 
  

I have two models news.article and portfolio.entry. Both models have a BooleanField for setting "is_campaign" to true.

Im trying to write a custom templatetag so I can get the latest campaign article (There should only be one)

Here is my templatetag: campaign_article.py

from itertools import chain
from django import template

from news.models import Article
from portfolio.models import Entry

register = template.Library()

def get_campaign():
        #Get the newest news article with is_campaign=True
        article = Article.objects.filter(is_campaign=True).order_by('-pub_date')[:1]

        #Get the newest portfolio entry with is_campaign=True
        portfolio = Portfolio_entry.objects.filter(is_campaign=True).order_by('-pub_date')[:1]

        #combine article, and entry and display only the newest
        campaign_article = list(chain(article, portfolio))[:1]


        return {'campaign_article': campaign_article}



register.tag('campaign', get_campaign)

I have tried this in my template:

{% load campaign_article %}
{% for campaign_article in campaign %}

{{ campaign_article.id }}

{% endfor %}

But I don't get any output. Is this the wrong method ?

解决方案

You would want to create assignment_tag rather than a generic tag. So you can update your tag as:

def get_campaign():
    #your stuff
    ....

    return campaign_article

register.assignment_tag(get_campaign, name='campaign')

And update template as:

{% load campaign_article %}
{% campaign as campaign_list %} {# loads the tags and creates campaign_list context variable #}
{% for campaign_article in campaign_list %}
    {{ campaign_article.id }}
{% endfor %}

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