def lookup_allowed(self, lookup, value):
from django.contrib.admin.filters import SimpleListFilter
model = self.model
# Check FKey lookups that are allowed, so that popups produced by
# ForeignKeyRawIdWidget, on the basis of ForeignKey.limit_choices_to,
# are allowed to work.
for fk_lookup in model._meta.related_fkey_lookups:
# As ``limit_choices_to`` can be a callable, invoke it here.
if callable(fk_lookup):
fk_lookup = fk_lookup()
for k, v in widgets.url_params_from_lookup_dict(fk_lookup).items():
if k == lookup and v == value:
return True
relation_parts = []
prev_field = None
for part in lookup.split(LOOKUP_SEP):
try:
field = model._meta.get_field(part)
except FieldDoesNotExist:
# Lookups on non-existent fields are ok, since they're ignored
# later.
break
# It is allowed to filter on values that would be found from local
# model anyways. For example, if you filter on employee__department__id,
# then the id value would be found already from employee__department_id.
if not prev_field or (prev_field.is_relation and
field not in prev_field.get_path_info()[-1].target_fields):
relation_parts.append(part)
if not getattr(field, 'get_path_info', None):
# This is not a relational field, so further parts
# must be transforms.
break
prev_field = field
model = field.get_path_info()[-1].to_opts.model
if len(relation_parts) <= 1:
# Either a local field filter, or no fields at all.
return True
clean_lookup = LOOKUP_SEP.join(relation_parts)
valid_lookups = [self.date_hierarchy]
for filter_item in self.list_filter:
if isinstance(filter_item, type) and issubclass(filter_item, SimpleListFilter):
valid_lookups.append(filter_item.parameter_name)
elif isinstance(filter_item, (list, tuple)):
valid_lookups.append(filter_item[0])
else:
valid_lookups.append(filter_item)
return clean_lookup in valid_lookups
评论列表
文章目录
