Django: How to access array index in template using variable

Question

I have array, lets say it:

str_types = ("open", "closed", "extend", "cancel")

Also I've some table. Which have int field named "type", contains number from 1 - 4. If field value is 1, It must print "open", if value equals 2, I must print "closed" etc.

So in template:

{% for a in ticket %}
<div>{{ str_types.a.types }}</div>
{% endfor %}

Result is blank. How to access that str_types array's index?

catavaran · Accepted Answer · 2015-03-05 07:48:28Z

2

You can't do it without custom template tag or filter.

from django import template

register = template.Library()

@register.filter
def get_by_index(l, i):
    return l[i]

And the in the template:

{% load my_tags %}
{{ str_types|get_by_index:a.types }}

But why you need this? The django way is to set the choices attribute of the types field and the use it in the template as {{ a.get_types_display }}.

edited Mar 5, 2015 at 7:48

answered Mar 5, 2015 at 7:40

catavaran

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6 Comments

Gereltod Over a year ago

I don't have model. I just reading from existed database, using raw sql.

catavaran Over a year ago

Then you have to add the field in the view (simple) or use the template filter (more complicated). I added the example of such filter to the answer.

Gereltod Over a year ago

Never created custom filter before. I'll try and report back.

Gereltod Over a year ago

I just created templatetags folder in my app. Then created _init_.py empty file. Then created custom_filters.py. And put your codes inside it. Then loaded it in template {% load custom_filters %}. Then when I try use filter, error happening. 'custom_filters' is not a valid tag library: Template library custom_filters not found

Gereltod Over a year ago

Just restarted my service. And it works :) Thank you much sir.

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