Django 3 Web Development Cookbook - Fourth Edition

How to do it...

Execute the following steps:

1. In the admin.py file, create a PhotoFilter class that extends from SimpleListFilter, as follows:

# myproject/apps/products/admin.pyfrom django.contrib import adminfrom django.db import modelsfrom django.utils.translation import ugettext_lazy as _# other imports…ZERO = "zero"ONE = "one"MANY = "many"class PhotoFilter(admin.SimpleListFilter):    # Human-readable title which will be displayed in the    # right admin sidebar just above the filter options.    title = _("photos")    # Parameter for the filter that will be used in the    # URL query.    parameter_name = "photos"    def lookups(self, request, model_admin):        """        Returns a list of tuples, akin to the values given for model field choices. The first element in ...