Python 通过 Django 模板中的键访问字典
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Accessing dictionary by key in Django template
提问by disruptive
I'm passing a dictionary from my view to a template. So {"key1":"value1","key2":"value2"}is passed in and looping through key,value pairs is fine, however I've not found an elegant solution from access directly in the view from a specific key, say "key1"for example bu json.items["key1"]. I could use some if/then statements, but I'd rather do directly is there a way?
我正在将我的视图中的字典传递给模板。所以{"key1":"value1","key2":"value2"}传入并循环遍历键，值对很好，但是我还没有从特定键的视图中直接访问找到一个优雅的解决方案"key1"，例如 bu json.items["key1"]。我可以使用一些 if/then 语句，但我宁愿直接使用有没有办法？
Here is looping code in the html template:
这是 html 模板中的循环代码：
{% for key, value in json.items %}
<li>{{key}} - {{value}}</li>
{% endfor %}
采纳答案by Alasdair
The Django template language supports looking up dictionary keys as follows:
Django 模板语言支持查找字典键，如下所示：
{{ json.key1 }}
See the template docs on variables and lookups.
请参阅有关变量和查找的模板文档。
The template language does not provide a way to display json[key], where keyis a variable. You can write a template filter to do this, as suggested in the answers to this Stack Overflow question.
模板语言没有提供显示json[key], where keyis 变量的方法。您可以编写模板过滤器来执行此操作，如此Stack Overflow 问题的答案中所述。
回答by Deepak Verma
To overcome this problem you could try something like this:
为了克服这个问题，你可以尝试这样的事情：
def get_context_data(self, **kwargs):
context['cart'] = []
cart = Cart()
cart.name = book.name
cart.author = book.author.name
cart.publisher = book.publisher.name
cart.price = 123
cart.discount = 12
cart.total = 100
context['cart'].append(cart)
return context
class Cart(object):
"""
Cart Template class
This is a magic class, having attributes
name, author, publisher, price, discount, total, image
You can add other attributes on the fly
"""
pass
By this way you can access your cart something like this:
{% for item in cart %}
<div class="jumbotron">
<div>
<img src="{{item.image}}" />
<div class="book_name"> <b>{{item.name}}</b></div>
<div class="book_by"><i>{{item.author}}</i></div>
<span>Rs. {{item.price}}</span> <i>{{item.discount}}% OFF </i>
<b>Rs. {{item.total}}</b>
{% endfor %}
回答by Nandhitha Ramaraj
For example, to send the below dictionary
dict = {'name':'myname','number':'mynumber'}
例如，发送以下字典
dict = {'name':'myname','number':'mynumber'}
views :
return render(request, self.template_name, {'dict': dict})
意见：
return render(request, self.template_name, {'dict': dict})
To render the value in html template:
<p>{{ dict.name }}</p>
要在 html 模板中呈现值：
<p>{{ dict.name }}</p>
It prints 'myname'
它打印 'myname'
回答by Micah Walter
As @Alasdair suggests, you can use a template filter.
In your templatetagsdirectory, create the following file dict_key.py:
正如@Alasdair 所建议的，您可以使用模板过滤器。在您的templatetags目录中，创建以下文件dict_key.py：
from django.template.defaultfilters import register
@register.filter(name='dict_key')
def dict_key(d, k):
'''Returns the given key from a dictionary.'''
return d[k]
Then, in your HTML, you can write:
然后，在您的 HTML 中，您可以编写：
{% for k in json.items %}
<li>{{ k }} - {{ json.items|dict_key:k }}</li>
{% endfor %}
