Variable in a Variable in Django Template

Question

I have global variable accessible from every HTML file. The variable is called canAccessClients . Its a list of objects (clients) to which the logged user has access. It is mainly used in menu, so user can see only his clients. I can find the client's logo (its url) by canAccessClients.<some_index>.picture.url .

Now, I have one page where are only some clients.

I know the ID of these clients.

This client ID is not obviously the same as index in list of canAccessClients .

Because canAccessClients is only a list of client objects.

Now I need to show logo for same client which I know his ID.

I do it (maybe to bad idea, but works) by finding iterating through canAccessClients and looking for the needed ID.

{% for client in canAccessClients %}
   {% if client.id == client_data.CLIENT_ID %}
      <img class="client-menu-logo" src="{{ canAccessClients.{{ forloop.counter }}.picture.url }}" alt="logo">
   {% endif %}
{% endfor %}

Everything works and is ok, but... I need to pass forloop.counter variable into canAccessClients.<some_id>.picture.url , this does not work.

How can I use variable in some other variable in path like this?

Answer 1

You may write your own template tag to achieve this. Example:

@register.simple_tag
def get_image_url_by_id(id):
    url = Client.objects.get(pk=id).image_url # get image url from database
    return url

and in template:

{% with get_image_url_by_id forloop.counter as image_url %}
{{ image_url }}