How to do indexing in python dictionary using html template

Question

def send_template(request):
     my_folders = Folders.objects.filter(parent=None).order_by('name')
     new_headers = {}
     for foldr in my_folders:   
          en_count = FolderEntries.objects.filter(folder = foldr.id ).count()        
          new_headers[foldr.id] = en_count
     return render(request, 'folders.html', 'new_headers':new_headers)

new_headers contains data in such way:-
{190: 1, 196: 0, 199: 0, 121: 0, 185: 1, 194: 1, 108: 3, 168: 4, 197: 0, 195: 0, 198: 0, 171: 1}

Now i want to get new_headers in html template using indexing
For example:-
new_headers[190]

How to do this..Anyone plz help

i am sending this data to my html template:-
{190: 1, 196: 0, 199: 0, 121: 0, 185: 1, 194: 1, 108: 3, 168: 4, 197: 0, 195: 0, 198: 0, 171: 1}

Now i want to do indexing in this data.

Asked By: er abhi

||

Source

Answer 1

Indexing is deliberately not supported in the Django template language, because it is writing business logic in the template. For a fixed key, you can use new_headers.190, you can also register a custom lookup, but usually that means that the logic is not effective.

You can .annotate(…) ^[Django-doc] with:

from django.db.models import Count


def send_template(request):
    my_folders = (
        Folders.objects.filter(parent=None)
        .order_by('name')
        .annotate(num_entries=Count('folderentries'))
    )
    return render(request, 'folders.html', {'new_headers': new_headers})

The Folders objects that arise from this QuerySet will have an extra attribute .num_entries.

Answered By: Willem Van Onsem

How to do indexing in python dictionary using html template

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