嵌套循环中的Django模板计数器 [英] Django template counter in nested loops

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问题描述

我有一个我转到Django模板的两个字典的列表:

  base_parts = [
{'important item':43},
{'less item':22,'less item':3,'less item':45}
]

在我的模板我可以这样做:

  {%for base_part in base_parts%} 
{%for k,v in base_part.items%}

{#... do stuff#}

{#我尝试获得运行总计的项目作为ID#}
内部ID:{%forloop.counter0%}< BR />
外部ID:{%forloop.parentloop.counter0%}< BR />

{%endfor%}
{%endfor%}

你可以看到,我想要的是我已经迭代的项目总数的总计,但是我包括的两种方法都返回重复。我知道我可以连接这些循环,但是我使用的是一个formset,并且真的希望id被索引0,1,2 ...等。



是否有一种在模板中实现这种类型计数的方法?



任何帮助非常感谢。



编辑



此时的输出如下所示:

  outerID:0< br /> 
innerID:0< br />
outerID:0< br />
innerID:1< br />
outerID:1< br />
innerID:0< br />
outerID:1< br />
innerID:1< br />
outerID:1< br />
innerID:2< br />

我想要:

 totalID:0< br /> 
totalID:1< br />
totalID:2< br />
totalID:3< br />
totalID:4< br />
totalID:5< br />
totalID:6< br />
totalID:7< br />
totalID:8< br />
totalID:9< br />


解决方案

我找到了一个更好的解决方案, itertools 。 (比我以前的答案更好)
您可以将循环的当前状态设置为发送到视图上下文的itertools变量。
这次我尝试一个虚拟的Django项目,它的作用就像一个魅力。



views.py:

  from django.shortcuts import render_to_response 
import itertools

def home(request):
iterator = itertools.count()
base_parts = [
{'important item':43},
{'less item1':22,'less item2':3,'less item3':45},
{'最重要的项目':55}
]
返回render_to_response('index.html',
{'base_parts':base_parts,'iterator':iterator})

index.html:

  {base for base_parts%中的%%
{%for k,v in base_part.items%}
{{iterator.next}} - {{v}}< br />
{%endfor%}
{%endfor%}

HTML输出:

  0  -  43 
1 - 22
2 - 45
3 - 3
4 - 55






排序值:



(这部分不是实际问题的答案,更像是在玩)



您可以使用Django的 SortedDict ,而不是Python的内置字典来保留项目订单。



views.py

  from django.shortcuts import render_to_response 
导入itertools
从django.utils.datastructures import SortedDict

def home(request):
iterator = itertools.count()
base_parts = [
SortedDict([('important item',43)]),
SortedDict([('less item1',22),
('less item2',3),
('less item3',45)]),
SortedDict([('最重要的项目',55)])
]
print base_parts [1]
return render_to_response 'index.html',
{'base_parts':base_parts,'iterator':iterator})

HTML输出:

  0  -  43 
1 - 22
2 - 3
3 - 45
4 - 55






编辑2014-May-25



您还可以使用 collections.OrderedDict ,而不是Django的SortedDict。



编辑2016- 6月28日



调用 iterator.next 在Python 3中不起作用。您可以创建你自己的迭代器类,继承自itertools.count:

  import itertools 
class TemplateIterator(itertools.count )
def next(self):
return next(self)


Hi I have a list of two dictionaries I am passing to a Django template:

base_parts = [
    {'important item': 43},
    {'lesser item': 22, 'lesser item': 3, 'lesser item': 45}
]

in my template I can do this:

{% for base_part in base_parts %}
    {% for k, v in base_part.items %}

    {# ...do stuff #}

    {# I try to get a running total of items to use as an ID #}
    inner ID: {% forloop.counter0 %}< br/>
    outer ID: {% forloop.parentloop.counter0 %}< br/>

    {% endfor %}
{% endfor %}

As you can see, what I want is a running total of the total number of items I have iterated through, but both methods I have included return duplicates. I know I could concatenate the loops, but I am using a formset and really would like the ids to be indexed 0,1,2...etc.

Is there a way to achieve this type of count in the template?

Any help much appreciated.

EDIT

output at the moment looks like:

outerID: 0<br />
innerID: 0<br />
outerID: 0<br />
innerID: 1<br />
outerID: 1<br />
innerID: 0<br />
outerID: 1<br />
innerID: 1<br />
outerID: 1<br />
innerID: 2<br />

I want:

totalID: 0<br />
totalID: 1<br />
totalID: 2<br />
totalID: 3<br />
totalID: 4<br />
totalID: 5<br />
totalID: 6<br />
totalID: 7<br />
totalID: 8<br />
totalID: 9<br />

解决方案

I found a better solution with itertools. (Better than my previous answer) You can set current state of the loop to the itertools variable sent to the view context. This time i tried on a dummy Django project and it works like a charm.

views.py:

from django.shortcuts import render_to_response
import itertools

def home(request):
    iterator=itertools.count()
    base_parts = [
        {'important item': 43},
        {'lesser item1': 22, 'lesser item2': 3, 'lesser item3': 45},
        {'most important item': 55}
    ]
    return render_to_response('index.html', 
                             {'base_parts': base_parts, 'iterator':iterator})

index.html:

{% for base_part in base_parts %}
    {% for k, v in base_part.items %}
        {{ iterator.next }} - {{ v }}<br/>
    {% endfor %}
{% endfor %}

HTML Output:

0 - 43
1 - 22
2 - 45
3 - 3
4 - 55


Sorted values:

(This part is not an answer to the actual question. It's more like I'm playing around)

You can use Django's SortedDict instead of Python's built-in dictionary to keep items order.

views.py

from django.shortcuts import render_to_response
import itertools
from django.utils.datastructures import SortedDict

def home(request):
    iterator=itertools.count()
    base_parts = [
        SortedDict([('important item', 43)]),
        SortedDict([('lesser item1', 22), 
                    ('lesser item2', 3), 
                    ('lesser item3', 45)]),
        SortedDict([('most important item', 55)])
    ]
    print base_parts[1]
    return render_to_response('index.html', 
                             {'base_parts': base_parts, 'iterator':iterator})

HTML Output:

0 - 43
1 - 22
2 - 3
3 - 45
4 - 55


Edit 2014-May-25

You can also use collections.OrderedDict instead of Django's SortedDict.

Edit 2016-June-28

Calling iterator.next doesn't work in Python 3. You can create your own iterator class, inheriting from itertools.count:

import itertools
class TemplateIterator(itertools.count):
    def next(self):
        return next(self)

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