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

Accessing Dictionary Values with Dynamic Keys in Django Templates

Django templates provide a convenient way to work with dictionaries, enabling developers to access values using the dot notation (e.g., {{ mydict.key1}}). However, when the key is a loop variable, such as item.NAME in the example provided, accessing the dictionary value directly becomes problematic.

Solution: Utilizing Custom Template Filters

To overcome this challenge, Django offers the ability to define custom template filters that extend the functionality of the template system. Here's a filter that allows you to look up dictionary values with variable keys:

# import the necessary modules
from django.template.defaulttags import register

# define the custom template filter
@register.filter
def get_item(dictionary, key):
    return dictionary.get(key)

The get_item filter uses the get method to retrieve the value corresponding to the provided key from the given dictionary. If the key is not found in the dictionary, get_item will return None instead of raising a KeyError.

Usage in Templates

To use the custom filter, simply pipe the dictionary and the variable key to it, as shown below:

{{ mydict|get_item:item.NAME }}

In this example, mydict is the dictionary containing the key-value pairs, and item.NAME is the variable key. The get_item filter will look up the value in mydict using the key item.NAME and return the corresponding value.

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