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filters.py
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111 lines (90 loc) · 3.7 KB
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# encoding=utf-8
# Thanks to http://www.djangosnippets.org/snippets/1051/
#
# Authors: Marinho Brandao <marinho at gmail.com>
# Guilherme M. Gondim (semente) <semente at taurinus.org>
from __future__ import absolute_import, unicode_literals
from django.contrib.admin.filters import ChoicesFieldListFilter
from django.db.models import Count
from django.utils.encoding import smart_text
from django.utils.safestring import mark_safe
from django.utils.translation import ugettext as _
from django import VERSION as DJANGO_VERSION
from feincms.utils import shorten_string
class ParentFieldListFilter(ChoicesFieldListFilter):
"""
Improved list_filter display for parent Pages by nicely indenting hierarchy
In theory this would work with any mptt model which uses a "title"
attribute.
my_model_field.page_parent_filter = True
"""
def __init__(self, f, request, params, model, model_admin,
field_path=None):
super(ParentFieldListFilter, self).__init__(
f, request, params, model, model_admin, field_path)
parent_ids = model.objects.exclude(parent=None).values_list(
"parent__id", flat=True).order_by("parent__id").distinct()
parents = model.objects.filter(pk__in=parent_ids).values_list(
"pk", "title", "level")
self.lookup_choices = [(
pk,
"%s%s" % (
" " * level,
shorten_string(title, max_length=25)),
) for pk, title, level in parents]
def choices(self, cl):
yield {
'selected': self.lookup_val is None,
'query_string': cl.get_query_string({}, [self.lookup_kwarg]),
'display': _('All')
}
for pk, title in self.lookup_choices:
yield {
'selected': pk == int(self.lookup_val or '0'),
'query_string': cl.get_query_string({self.lookup_kwarg: pk}),
'display': mark_safe(smart_text(title))
}
def title(self):
return _('Parent')
class CategoryFieldListFilter(ChoicesFieldListFilter):
"""
Customization of ChoicesFilterSpec which sorts in the user-expected format
my_model_field.category_filter = True
"""
def __init__(self, f, request, params, model, model_admin,
field_path=None):
super(CategoryFieldListFilter, self).__init__(
f, request, params, model, model_admin, field_path)
# Restrict results to categories which are actually in use:
if DJANGO_VERSION < (1, 8):
related_model = f.related.parent_model
related_name = f.related.var_name
elif DJANGO_VERSION < (2, 0):
related_model = f.rel.to
related_name = f.related_query_name()
else:
related_model = f.remote_field.model
related_name = f.related_query_name()
self.lookup_choices = sorted(
[
(i.pk, '%s (%s)' % (i, i._related_count))
for i in related_model.objects.annotate(
_related_count=Count(related_name)
).exclude(_related_count=0)
],
key=lambda i: i[1],
)
def choices(self, cl):
yield {
'selected': self.lookup_val is None,
'query_string': cl.get_query_string({}, [self.lookup_kwarg]),
'display': _('All')
}
for pk, title in self.lookup_choices:
yield {
'selected': pk == int(self.lookup_val or '0'),
'query_string': cl.get_query_string({self.lookup_kwarg: pk}),
'display': mark_safe(smart_text(title))
}
def title(self):
return _('Category')