custom filter in admin.py

customfilter.py

from datetime import date
from django.contrib import admin
from .models import Question
from django.utils.translation import gettext_lazy as _

class CustomListFilter(admin.SimpleListFilter):

    title = _('pub_date')
    parameter_name = 'pubdate'

    def lookups(self, request, model_admin):
        
        return (
            ('one_year_old', _('One Year old')),
            ('two_year_old', _('Two Years old')),
        )

    def queryset(self, request, queryset):
        
        if self.value() == 'one_year_old':
            return queryset.filter(
                pub_date__gte=date(2021, 1, 1),
                pub_date__lte=date(2022, 12, 31),
            )
        if self.value() == 'two_year_old':
            return queryset.filter(
                pub_date__gte=date(2020, 1, 1),
               
            )


@admin.register(Question)
class QuestionAdmin(admin.ModelAdmin):
    list_display = (
        'question_text',
        'pub_date',
      

    )
    list_filter = (  CustomListFilter,
        ('isChoice', admin.BooleanFieldListFilter),
        ('question_text', admin.EmptyFieldListFilter),
    )