Default filter in admin site [duplicate]

Question

Is there a way of setting the default value for a filter in the admin site?

Class Account(models.model): 
    isClosed = models.BooleanField(blank=True) 
    name = models.CharField(core=True, max_length=255,unique=True) 

In admin.py:

class Admin(admin.ModelAdmin): 
     list_filter = ['isClosed'] 

On the admin page, I want the default value for the 'isClosed' field to be 'no', not 'All'.

Thanks.

Answer 1

You'd need to create a custom list filter, inheriting from django.contrib.admin.filters.SimpleListFilter and filtering on unclosed accounts by default. Something along these lines should work:

from datetime import date

from django.utils.translation import ugettext_lazy as _
from django.contrib.admin import SimpleListFilter


class IsClosedFilter(SimpleListFilter):
    title = _('Closed')

    parameter_name = 'closed'

    def lookups(self, request, model_admin):
        return (
            (None, _('No')),
            ('yes', _('Yes')),
            ('all', _('All')),
        )

    def choices(self, cl):
        for lookup, title in self.lookup_choices:
            yield {
                'selected': self.value() == lookup,
                'query_string': cl.get_query_string({
                    self.parameter_name: lookup,
                }, []),
                'display': title,
            }

    def queryset(self, request, queryset):
        if self.value() == 'closed':
            return queryset.filter(isClosed=True)
        elif self.value() is None:
            return queryset.filter(isClosed=False)


class Admin(admin.ModelAdmin):
    list_filter = [isClosedFilter]