python - Django - string from variable inside template tag -

i can't figure out how send multiple arguments custom template filter.

the problem use template variables arguments.

custom template filter

@register.filter def is_scheduled(product_id,dayhour):     day,hour = dayhour.split(',')     return product.objects.get(id=product_id).is_scheduled(day,hour) 

normal use

{% if product.id|is_scheduled:"7,22" %}...{% endif %} 

the line above work correctly put 2 arguments - 7 , 22 filter (tested - works). problem want put variables instead of plain text/string argument.

in template:

{%  day=forloop.counter|add:"-2" hour=forloop.parentloop.counter|add:"-2" %} 

now, want use {{ day }} , {{ hour }} arguments.

i tried example:

{% if product.id|is_scheduled:"{{ day }},{{ hour }}" %}...{% endif %} 

but raises:

exception value: invalid literal int() base 10: '{{ day }}'

do have ideas?

you don't need {{}} when you're inside {% %}. use names directly in tag , use string concat template syntax add.

in case day , hour strings, type conversion string required before concating strings:

{% day|stringformat:"s" sday hour|stringformat:"s" shour %}     {% sday|add:","|add:shour arg %}         {% if product.id|is_scheduled:arg %}...{% endif %}     {% endwith %} {% endwith %}