我在django-tables2表上使用Django过滤器，我有一个自定义过滤器，该过滤器使用一个搜索框搜索所有字段。 SiteFilterEx，它将获取所有字段名称并创建或查询以搜索每个字段名称。
我的模型具有以下特征：
class Site(models.Model):
location = models.CharField(max_length=50)
ref = models.CharField(max_length=255, blank=True, null=True)
bgp_as = models.CharField(max_length=6, verbose_name="BGP AS Number")
opening_date = models.DateField(verbose_name="Site opening date", blank=True, null=True)
tel = models.CharField(max_length=20, blank=True, null=True)
address = models.CharField(max_length=255, blank=True, null=True)
town = models.CharField(max_length=255, blank=True, null=True)
postcode = models.CharField(max_length=10, blank=True, null=True)
class DeviceCircuitSubnets(models.Model):
device = models.ForeignKey(Device, on_delete=models.CASCADE)
circuit = models.ForeignKey(Circuit, on_delete=models.CASCADE, blank=True, null=True)
subnet = models.ForeignKey(Subnet, on_delete=models.CASCADE)
active_link = models.BooleanField(default=False, verbose_name="Active Link?")
active_link_timestamp = models.DateTimeField(auto_now=True, blank=True, null=True)
但是，id还想搜索带注释的字段“ active_circuit”（可以在QuerySet中看到） 但是，当我将其添加到字段列表中时，出现错误，指出它不存在。 我需要以某种方式将带注释的字段作为有效字段传递到过滤器中进行搜索或其他？
过滤器：
class SiteFilterEx(django_filters.FilterSet):
ex = django_filters.CharFilter(label='Ex filter', method='filter_ex')
search_fields = ['location', 'sitesupernet__subnet', 'bgp_as', 'opening_date','town','postcode','active_circuit']
def filter_ex(self, qs, name, value):
if value:
q_parts = value.split()
# Use a global q_totals
q_totals = Q()
# This part will get us all possible segmantiation of the query parts and put it in the possibilities list
combinatorics = itertools.product([True, False], repeat=len(q_parts) - 1)
possibilities = []
for combination in combinatorics:
i = 0
one_such_combination = [q_parts[i]]
for slab in combination:
i += 1
if not slab: # there is a join
one_such_combination[-1] += ' ' + q_parts[i]
else:
one_such_combination += [q_parts[i]]
possibilities.append(one_such_combination)
# Now, for all possiblities we'll append all the Q objects using OR
for p in possibilities:
list1=self.search_fields
list2=p
perms = [zip(x,list2) for x in itertools.permutations(list1,len(list2))]
for perm in perms:
q_part = Q()
for p in perm:
q_part = q_part & Q(**{p[0]+'__icontains': p[1]})
q_totals = q_totals | q_part
qs = qs.filter(q_totals)
return qs
class Meta:
model = Site
fields = ['ex']
form = SiteFilterForm
视图：
class Sites(LoginRequiredMixin, ExportMixin, PagedFilteredTableView):
model = Site
table_class = SiteTable
template_name = "app_settings/table_view.html"
login_url = '/login/'
redirect_field_name = 'redirect_to'
filter_class = SiteFilterEx
exclude_columns = ("buttons", )
table_pagination = {'per_page': 12}
def dispatch(self, *args, **kwargs):
site_type = get_object_or_404(SiteType, pk=self.kwargs['site_type'])
site_state = 'Open' if self.kwargs['state'] else 'Closed'
self.site_type_name = '{} {}s'.format(site_state, site_type.site_type)
self.site_type_icon = 'fa {}'.format(site_type.icon)
return super(Sites, self).dispatch(*args, **kwargs)
def get_queryset(self):
site_type = self.kwargs['site_type']
subnet = Subquery(
DeviceCircuitSubnets.objects.filter(device__site_id=OuterRef('id'), \
active_link=True, \
circuit__decommissioned=False
).values('circuit__name')[:1])
active_circuit = Subquery(
DeviceCircuitSubnets.objects.filter(device__site_id=OuterRef('id'), \
active_link=True, \
circuit__decommissioned=False
).values('circuit__name')[:1])
return super(Sites, self).get_queryset().filter(
is_live=self.kwargs['state'], site_type_id=site_type
).annotate(
active_circuit=active_circuit
).prefetch_related('sitesupernet_set')
def get_context_data(self, **kwargs):
context = super().get_context_data(**kwargs)
context['page_icon']=self.site_type_icon
context['page_title']=self.site_type_name
return context
跟踪错误：
File "/usr/local/lib/python3.6/site-packages/django/core/handlers/exception.py" in inner
34. response = get_response(request)
File "/usr/local/lib/python3.6/site-packages/django/core/handlers/base.py" in _get_response
115. response = self.process_exception_by_middleware(e, request)
File "/usr/local/lib/python3.6/site-packages/django/core/handlers/base.py" in _get_response
113. response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/usr/local/lib/python3.6/site-packages/django/views/generic/base.py" in view
71. return self.dispatch(request, *args, **kwargs)
File "/itapp/itapp/sites/views.py" in dispatch
127. return super(Sites, self).dispatch(*args, **kwargs)
File "/usr/local/lib/python3.6/site-packages/django/contrib/auth/mixins.py" in dispatch
52. return super().dispatch(request, *args, **kwargs)
File "/usr/local/lib/python3.6/site-packages/django/views/generic/base.py" in dispatch
97. return handler(request, *args, **kwargs)
File "/usr/local/lib/python3.6/site-packages/django/views/generic/list.py" in get
142. self.object_list = self.get_queryset()
File "/itapp/itapp/sites/views.py" in get_queryset
142. return super(Sites, self).get_queryset().filter(
File "/itapp/itapp/itapp/functions.py" in get_queryset
560. return self.filter.qs
File "/usr/local/lib/python3.6/site-packages/django_filters/filterset.py" in qs
237. qs = self.filter_queryset(qs)
File "/usr/local/lib/python3.6/site-packages/django_filters/filterset.py" in filter_queryset
224. queryset = self.filters[name].filter(queryset, value)
File "/usr/local/lib/python3.6/site-packages/django_filters/filters.py" in __call__
765. return self.method(qs, self.f.field_name, value)
File "/itapp/itapp/sites/filters.py" in filter_ex
53. qs = qs.filter(q_totals)
File "/usr/local/lib/python3.6/site-packages/django/db/models/query.py" in filter
892. return self._filter_or_exclude(False, *args, **kwargs)
File "/usr/local/lib/python3.6/site-packages/django/db/models/query.py" in _filter_or_exclude
910. clone.query.add_q(Q(*args, **kwargs))
File "/usr/local/lib/python3.6/site-packages/django/db/models/sql/query.py" in add_q
1290. clause, _ = self._add_q(q_object, self.used_aliases)
File "/usr/local/lib/python3.6/site-packages/django/db/models/sql/query.py" in _add_q
1312. current_negated, allow_joins, split_subq, simple_col)
File "/usr/local/lib/python3.6/site-packages/django/db/models/sql/query.py" in _add_q
1318. split_subq=split_subq, simple_col=simple_col,
File "/usr/local/lib/python3.6/site-packages/django/db/models/sql/query.py" in build_filter
1190. lookups, parts, reffed_expression = self.solve_lookup_type(arg)
File "/usr/local/lib/python3.6/site-packages/django/db/models/sql/query.py" in solve_lookup_type
1049. _, field, _, lookup_parts = self.names_to_path(lookup_splitted, self.get_meta())
File "/usr/local/lib/python3.6/site-packages/django/db/models/sql/query.py" in names_to_path
1420. "Choices are: %s" % (name, ", ".join(available)))
Exception Type: FieldError at /sites/sites/1/2/
Exception Value: Cannot resolve keyword 'active_circuit' into field. Choices are: acc_short, address, device, downtimeschedule, id, is_live, last_hw_refresh_date, location, no_wallboard, opening_date, postcode, ref, site_type, site_type_id, sitecircuits, sitecontacts, sitefile, sitenotes, sitesupernet, snmpdata, tel, town, watchlist
答案 0 :(得分：0)
尝试为Subquery提及类型，可以从django.db import models导入模型
active_circuit = Subquery(
DeviceCircuitSubnets.objects.filter(device__site_id=OuterRef('id'), \
active_link=True, \
circuit__decommissioned=False
).values('circuit__name')[:1],output_field=models.CharField())