wjurkowlaniec

from django.contrib.admin import FieldListFilter
from django.utils.translation import ugettext as _


class ActiveValueFilter(FieldListFilter):
    """list_filter which displays only the values for a field which are in use

    This is handy when a large range has been filtered in some way which means
    most of the potential values aren't currently in use. This requires a 
    queryset field or annotation named "item_count" to be present so it can