How to Access Dictionary Values Using Loop Variables as Keys in Django Templates?

Django Template Variable Dictionary Value Lookup

In Django templates, accessing dictionary values is straightforward using the syntax {{ mydict.key1 }} or {{ mydict.key2 }}. However, when dealing with loop variables as dictionary keys, the conventional approach fails.

Consider the following scenario:

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

{% for item in list %}
  {{ mydict.item.NAME }}  # This fails
{% endfor %}

In the above code, item.NAME serves as a loop variable with an attribute NAME. However, mydict.item.NAME doesn't provide the desired result.

To overcome this challenge, a custom template filter can be created:

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

The get_item filter utilizes the .get() method to retrieve the value associated with the specified key. This ensures that if the key is absent, it returns None instead of raising a KeyError.

To use the filter, modify the template code as follows:

{{ mydict|get_item:item.NAME }}

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