如何在django中编写更好的模板标签 [英] How to write better template tags in django

问题描述

我已经看到如何编写模板标签，根据这样的模板设置上下文变量

  {％ my_template_tag'blah'as my_context_variable％} 
  

但是我想要这样做：由于组和用户都设置在$ p

视图中的上下文

  {％is_in_group group user as is_member％} 
 
 {％if is_member％ } 
＃....做东西.... 
 {％endif％} 
  

或理想情况如下：

  {％if is_in_group group user％} 
＃... 。
 {％end if％} 
  

显然， code> is_member 在视图中 - 但这只是一个例子，很高兴知道如何做这样的事情！

解决方案

Evgeny对smart_if模板标签有个好主意。但是，如果这样做不起作用，您可能会发现自定义过滤器比较容易编写。如下：

  @ register.filter 
 def is_in（obj，val）：
 return val is在obj 
  

，你会这样使用：

  {％if user | is_in：group.users％} 
  

I've seen how I can write template tags that set a context variable based on a template like this

{% my_template_tag 'blah' as my_context_variable %}

But I'd like to be able to do this:

given that both group and user are set in the context in the view

{% is_in_group group user as is_member %}

{% if is_member %}
   #.... do stuff ....
{% endif %}

or ideally something like this:

{% if is_in_group group user %}
   # ....
{% end if %}

Obviously the other way round is to just set is_member in the view - but this is just an example and would be good to know how to do something like this anyway!

解决方案

Evgeny has a good idea with the smart_if template tag. However, if that doesn't work, you will probably find that a custom filter is easier to write for this sort of comparison. Something like:

@register.filter
def is_in(obj, val):
    return val is in obj

and you would use it like this:

{% if user|is_in:group.users %}

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