download list with category ManyToManyField

Question

I like a download list with all Files with the Category == 'download' in all available categories. (ManyToMany Field)

>>>from feincms.module.medialibrary.models import MediaFile, Category
>>>MediaFile.objects.filter(categories=1) #my download pk, these files I need
>>>Category.objects.all() # these categories I need

models.py: https://github.com/feincms/feincms/blob/master/feincms/module/medialibrary/models.py

it must be a mix from :

{% for category in category %}
<h1>{{ category }}</h1>
    {% for file in category.mediafile_set.all %}
        <li> {{ file }} </li>
    {% endfor %}
 {% endfor %}

but not all files, only the files with the category (or let's say Tag) 'download'.

and:

{% regroup file by categories.all as media_list %}
<ul>
{% for categories in media_list %}
    <li>{{ categories.grouper }}
    <ul>
        {% for file in categories.list %}
          <li>{{ file }}</li>
        {% endfor %}
    </ul>
    </li>
{% endfor %}
</ul>

these files are good, but the categories are not in the right position and format.

I need a tree like this:

Category 1 # the Download category, all files

• file 3
• file 1
• file 2

Category 2

• file 3

Category 3

• |_ SubCategory 3.1 (if chidren, next challenge)
  • file 2
• file 3

my views.py this:

from feincms.module.medialibrary.models import MediaFile, Category

def medialistview(request):
    file = MediaFile.objects.filter(categories=1)
    category = Category.objects.all()   
    return render_to_response('media.html',{
        'file': file, 'category': category, 
    },context_instance=RequestContext(request))

I'm a beginner, maybe it is very easy...

Answer 1

You can use self referential template includes, and then just pass the categories variable in as the current children of each category as you iterate through..

Lets say this is: category_tree.html

{% regroup file by categories.all as media_list %}
<ul>
{% for category in media_list %}
    <li>{{ category.grouper }}
    {% include "category_tree.html" with categories=category.children %}
    <ul>
        {% for file in category.list %}
          <li>{{ file }}</li>
        {% endfor %}
    </ul>
    </li>
{% endfor %}
</ul>