Flask Framework Cookbook

Creating a custom Jinja2 filter

After looking at the previous recipe, experienced developers might think that it was stupid to use a context processor to create a descriptive product name. We can simply write a filter to get the same result; this will make things much cleaner. A filter can be written to display the descriptive name of the product as shown here:

@product_blueprint.template_filter('full_name')
def full_name_filter(product):
    return '{0} / {1}'.format(product['category'], product['name'])

This can be used as follows:

{{ product|full_name }}

The preceding code will yield a similar result as it did in the previous recipe.

How to do it…

To take things to a higher level, let's create a filter to format the currency based on the current local ...