如何迭代 django 模板中的嵌套字典 [英] How to iterate over nested dictionaries in django templates

问题描述

我不确定迭代嵌套字典以打印每个日期每个水果的总值和良好值的矩阵的最有效方法.以下面的两个列表和字典为例:

I'm not sure the most efficient way to iterate over my nested dictionaries to print a matrix of the total and good values for every fruit for each date. Take for instance the two lists and dictionary below:

fruits = ['apples','oranges','bananas']
harvest_dates = ['2011-07-23','2011-07-22','2011-07-21']

harvest_data = {
  'apples': {
    '2011-07-23': {
      'total': 100,
      'good': 80},
     '2011-07-22': {
       'total': 97,
       'good': 92},
     '2011-07-21': {
       'total': 90,
       'good': 85}
  },
  'oranges': {
    '2011-07-23': {
      'total': 86,
      'good': 82},
    '2011-07-22': {
      'total': 90, 
      'good': 75},
    '2011-07-21': {
      'total': 92,
      'good': 92}
  },
  'bananas': {
    '2011-07-23': {
      'total': 10,
      'good': 9},
    '2011-07-22': {
      'total': 12, 
      'good': 11},
    '2011-07-21': {
      'total': 9,
      'good': 9}
  }
}

我可以在 python 中轻松做到这一点:

I can easily do this in python:

for fruit in fruits:
  for day in harvest_dates:
    print "harvest: %s" % harvest_data[fruit][day]['total']
    print "good crop: %s" % harvest_data[fruit][day]['good']

但我不知道如何在 django 模板中访问这些数据.我一直在尝试诸如:

But I don't know how to access this data in django templates. I had been trying something such as:

{% for fruit in fruits %}
  ...
  {% for day in harvest_dates %}
    ...
    {{ harvest_data.fruit.day.total }}
    {{ harvest_data.fruit.day.good }}
    ...
  {% endfor %}
{% endfor %}

但它根本不起作用.

{% for fruit in fruits %}
  {{ harvest_data.fruit }}  <--- this does not exist
  {{ harvest_data[fruit] }}  <--- this does not work
{% endfor %}

我是一个完全的业余爱好者，我可能会在这一切上做错，但我已经在谷歌上搜索了很多，我不清楚获取我想要的数据的最佳方法是什么.

I'm a complete amateur and I'm probably going about this all wrong, but I've Google'd quite a bit and it's not clear to me what the best approach to getting the data I want is.

推荐答案

由于您熟悉 python，以下逻辑上是您希望在 Django 模板中遍历字典的方式:

Since you're familiar with python, the following is logically how you would want to iterate through your dictionary in a Django template:

for key,value in harvest_data.items():
...     print key
...     for key2,value2 in value.items():
...         print key2
...         for key3,value3 in value2.items():
...             print "%s:%s"%(key3,value3)

在您的模板中，这翻译如下:

In your template, this translates as follows:

{% for key, value in harvest_data.items %}
    {{ key }} <br>
    {% for key2,value2 in value.items %}
        {{ key2 }} <br>
        {% for key3, value3 in value2.items %}
            {{ key3 }}:{{ value3 }} <br>
        {% endfor %}
    {% endfor %}
{% endfor %}

在描述 for 模板标签的工作原理时，Django 文档实际上简要地包含了一个如何遍历字典的示例:

The Django docs actually briefly include an example of how to iterate through dictionaries when describing how the for template tag works:

https://docs.djangoproject.com/en/dev/ref/templates/builtins/#for

这篇关于如何迭代 django 模板中的嵌套字典的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！