Using custom methods in filter with django-rest-framework

Question

I would like to filter against query params in my REST API - see django docs on this. However, one parameter I wish to filter by is only available via a model @property

Answer 1

Use the 'action' parameter to specify a custom method - see django-filter docs

First define a method that filters a queryset using the value of the category parameter:

    def filter_category(queryset, value):
        if not value:
            return queryset

        queryset = ...custom filtering on queryset using 'value'...
        return queryset

Listing filter should look like this:

    class ListingFilter(django_filters.FilterSet):
        ...
        category = django_filters.CharFilter(action=filter_category)
        ...