Question

lets say i am passing a variable “subtotal” inside a template using ..

in my views.py

subtotal = 0
page_vars = Context({
    'players': players,
    'subtotal': subtotal,
})

in my html.

{% for player in players %}
{% subtotal += player.score %}

{{ player.name }} <td />
{{ player.score }} <td />

{% endfor %}
{{ subtotal }}

it gives me

Invalid block tag: ‘subtotal’, expected ’empty’ or ‘endfor’

can’t we have nested block tags in django templating system?

if yes, how?

there must be, as for me to calculate subtotal, i would have to calulate my subtotal, i have to run the same for loop at two places, which makes it highly ineffecient!

//mouse.

Answer 1

I would really advise that you retain separation of logic and display of information. The Django template system is purposely designed to minimize your ability to shoot yourself in the foot by gumming up your templates with logic and calculations.

Perform your calculations and logical manipulation in the view, and pass the finished product to the template. The template language is there to help you maintain code reusability and “debuggability” by attempting to enforce this separation of responsibility.