Django 3 Web Development Cookbook - Fourth Edition

How it works...

The list filter, based on the custom field that we just created, will be shown in the sidebar of the product list, as follows:

The PhotoFilter class has a translatable title and query parameter name as properties. It also has two methods, as follows:

• The lookups() method, which defines the choices of the filter
• The queryset() method, which defines how to filter QuerySet objects when a specific value is selected

In the lookups() method, we define three choices, as follows:

• There are no photos
• There is one photo
• There is more than one photo attached

In the queryset() method, we use the annotate() method of QuerySet to select ...