如何在for循环中使用django模板点符号 [英] How to use django template dot notation inside a for loop

问题描述

我正在尝试检索字典键的值，并在Django模板的页面上显示该值：

  { ％中的dictkey％％
< p> {{mydict.dictkey}}< / p> 
 {％endfor％} 
  

（让我们说'keys'和'mydict'传递到上下文中的模板）

Django呈现页面但没有字典内容（无效模板变量）

$ b $我假设问题是它试图做mydict ['dictkey']而不是mydict [实际键IN变量dictkey ]？

谢谢！

更新：
根据收到的答案，我需要补充说，我实际上正在寻找一个for循环中如何实现密钥查找。这更代表我的实际代码：

  {％for key，mydict1.items％的价值} 
< ; p为H. {{mydict2.key}}< / p> 
 {％endfor％} 
  

基本上，我有两个共享相同键的字典，所以我不能做第二个的items（）技巧。

解决方案

请参阅这是一个（可能是重复的）相关问题的答案。

它创建一个自定义过滤器，当应用于具有键作为参数的字典时，使用该键查找字典并返回结果。

代码：

  @ register.filter 
 def lookup（d，key）：
如果键不在d：
返回无
返回d [键] 
  

用法：

  {％for dict1.keys％} 
< p> {{dict2 | lookup：dictkey}}< / p> 
 {％endfor％} 
  

注册过滤器在文档。

我觉得很难过，这种事情并不是内置的。

I am trying to retrieve the value of a dictionary key and display that on the page in a Django template:

{% for dictkey in keys %}
    <p> {{ mydict.dictkey }} </p>
{% endfor %}

(let's say 'keys' and 'mydict' have been passed into the template in the Context)

Django renders the page but without the dictionary contents ("Invalid template variable")

I assume the problem is that it is trying to do mydict['dictkey'] instead of mydict[actual key IN the variable dictkey]? How does one "escape" this behavior?

Thanks!

UPDATE: Based on the answers received, I need to add that I'm actually looking specifically for how to achieve a key lookup inside a for loop. This is more representative of my actual code:

{% for key, value in mydict1.items %}
    <p> {{ mydict2.key }} </p>
{% endfor %}

Basically, I have two dictionaries that share the same keys, so I can't do the items() trick for the second one.

解决方案

See this answer to a (possibly duplicate) related question.

It creates a custom filter that, when applied to a dictionary with a key as it's argument, does the lookup on the dictionary using the key and returns the result.

Code:

@register.filter
def lookup(d, key):
    if key not in d:
        return None
    return d[key]

Usage:

{% for dictkey in dict1.keys %}
    <p> {{ dict2|lookup:dictkey }} </p>
{% endfor %}

Registering the filter is covered in the documentation.

I find it sad that this sort of thing isn't built in.

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