Django loop variable as key

Question

i am new to django and tried to use the variable of an loop as a key for another object:

this is my views.py

...
files = Files.objects.filter(dataset__id = instance.dataset.id)
context = {'files': files, 'range': range(files.count())}
return render_to_response("test.html", context, context_instance=RequestContext(request))

and my test.html looks like this:

{% for i in range %}
<img title="{{i}}" src="{{files.i.data_files.url}}"/>
{% endfor %}

if i use files.0.data_files.url (or 1,2,3..) instead of files.i. it works, but i want to give out all images and also need the position of the image.

can you help me please?

yedpodtrzitko · Accepted Answer · 2014-06-08 23:25:56Z

1

the thing you're probably looking for is a magic variable {{ forloop.counter }} (or {{ forloop.counter0 }} if you want to use zero-based index) available inside {% for %} loop:

{% for file in files %}
   <img title="{{ forloop.counter }}" src="{{file.data_files.url}}"/>
{% endfor %}

answered Jun 8, 2014 at 23:25

yedpodtrzitko

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5 Comments

vtni Over a year ago

if i use this, could it be possible that the counter is on e.g. 3 but it takes the 6th file?

yedpodtrzitko Over a year ago

tbh: I didnt fully understand your question, but maybe if you can add your models into the question I could get the idea what are you trying to achieve.

vtni Over a year ago

i mean i have an file object like files = {0:{...}, 1:{..}, ...} and wanted to know, if the loop is always sorted or could it possible that that an object from the end is called first in the loop? in this case the counter and the index wouldnt be the same

vtni Over a year ago

and also if i set files = {2:{..}, 0:{..}, 1:{..}, ..}, would it then also agree with the counter?

yedpodtrzitko Over a year ago

The code you wrote in your last two comments looks like files is a dictionary, but I can see in your views.py that it's a QuerySet (which is basically a list). So... you didnt explain it, you make it even more confusing. Just put your models.py into your question pls!

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