Django template how to look up a dictionary value with a variable


Question

mydict = {"key1":"value1", "key2":"value2"}

The regular way to lookup a dictionary value in a Django template is {{ mydict.key1 }}, {{ mydict.key2 }}. What if the key is a loop variable? ie:

{% for item in list %} # where item has an attribute NAME
  {{ mydict.item.NAME }} # I want to look up mydict[item.NAME]
{% endfor %}

mydict.item.NAME fails. How to fix this?

1
198
12/14/2017 1:14:27 PM

Accepted Answer

Write a custom template filter:

from django.template.defaulttags import register
...
@register.filter
def get_item(dictionary, key):
    return dictionary.get(key)

(I use .get so that if the key is absent, it returns none. If you do dictionary[key] it will raise a KeyError then.)

usage:

{{ mydict|get_item:item.NAME }}
316
10/9/2014 2:47:07 PM

Fetch both the key and the value from the dictionary in the loop:

{% for key, value in mydict.items %}
    {{ value }}
{% endfor %}

I find this easier to read and it avoids the need for special coding. I usually need the key and the value inside the loop anyway.


Licensed under: CC-BY-SA with attribution
Not affiliated with: Stack Overflow
Icon