Question

I would like to do something if one modeladmin is passed and do another thing if another modeladmin is passed. But it seems that the modeladmin doesn’t get passed as a parameter in list_filter while it does get passed in actions in django admin. why is this so?

from datetime import date

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

class DecadeBornListFilter(SimpleListFilter):
    # Human-readable title which will be displayed in the
    # right admin sidebar just above the filter options.
    title = _('decade born')

    # Parameter for the filter that will be used in the URL query.
    parameter_name = 'decade'

    def lookups(self, request, model_admin):
        """
        Returns a list of tuples. The first element in each
        tuple is the coded value for the option that will
        appear in the URL query. The second element is the
        human-readable name for the option that will appear
        in the right sidebar.
        """
        return (
            ('80s', _('in the eighties')),
            ('90s', _('in the nineties')),
        )

    def queryset(self, request, queryset):
        """
        Returns the filtered queryset based on the value
        provided in the query string and retrievable via
        `self.value()`.
        """
        # Compare the requested value (either '80s' or '90s')
        # to decide how to filter the queryset.
        if self.value() == '80s':
            return queryset.filter(birthday__gte=date(1980, 1, 1),
                                    birthday__lte=date(1989, 12, 31))
        if self.value() == '90s':
            return queryset.filter(birthday__gte=date(1990, 1, 1),
                                    birthday__lte=date(1999, 12, 31))

For example, in the example above, i would like to do something different if it is a student which is to check the birthday is between 90’s or 2000’s. But it is the parent, i would like to check if the birthday is between 70’s or 80’s? Just assume that different modeladmin will be passed. How do i include the modeladmin as parameter to do these changes? Need some guidance on this…

Answer 1

You could set self.model_admin:

class DecadeBornListFilter(SimpleListFilter):
    #[...]

    def lookups(self, request, model_admin):
        self.model_admin = model_admin
        # ...

    def queryset(self, request, queryset):
        # here you can use self.model_admin

Or, use inheritance:

class BaseDecadeBornListFilter(SimpleListFilter):
    # [...]


class DecadeBornListFilter1(BaseDecadeBornListFilter):
    # [...]


class DecadeBornListFilter2(BaseDecadeBornListFilter):
    # [...]


class StudentModelAdmin1(admin.ModelAdmin):
    list_filter = (DecadeBornListFilter1,)


class StudentModelAdmin2(admin.ModelAdmin):
    list_filter = (DecadeBornListFilter2,)