How to Access Dictionary Values with Variable Keys in Django Templates?

Django Templates: Accessing Dictionary Values with Variable Keys

Accessing dictionary values in Django templates is straightforward using the dot operator, i.e., {{ mydict.key }}. However, challenges arise when the key is itself a variable, particularly when it's a property of a loop variable.

Problem:

Consider the following situation:

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

{% for item in list %}
  {{ mydict.item.NAME }} # Attempt to look up mydict[item.NAME]
{% endfor %}

Here, the mydict.item.NAME syntax fails.

Solution:

To resolve this issue, you can create a custom template filter:

from django.template.defaulttags import register

@register.filter
def get_item(dictionary, key):
    return dictionary.get(key)

Note that the get() method is used instead of dictionary[key] to handle the case where the key is absent (returning None instead of raising a KeyError).

Usage:

Once the filter is registered, you can access dictionary values using variable keys as follows:

{{ mydict|get_item:item.NAME }}

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