[英]Override imported class variables - django/python
我需要將變量(或傳遞動態數據)覆蓋到導入的類。
filters.py
import django_filters
from .models import Gate, Tram, OperationArea, Bogie
from distutils.util import strtobool
from django import forms
class GateFilter(django_filters.FilterSet):
# Prepare dynamic lists with choices
tram_list = [(id, number) for id, number in Tram.objects.all().values_list('id', 'number')]
bogie_list = [(id, number) for id, number in Bogie.objects.all().values_list('id', 'number')]
area_list = [(id, area) for id, area in OperationArea.objects.all().values_list('id', 'area')]
# Generate fields
tram = django_filters.MultipleChoiceFilter(choices=tram_list, label=u'Tramwaj')
car = django_filters.MultipleChoiceFilter(choices=Gate.CAR_SYMBOLS, label=u'Człon')
bogie = django_filters.MultipleChoiceFilter(choices=bogie_list, label=u'Wózek')
bogie_type = django_filters.MultipleChoiceFilter(choices=Gate.BOGIE_TYPES, label=u'Typ wózka')
area = django_filters.MultipleChoiceFilter(choices=area_list, label=u'Obszar')
operation_no = django_filters.CharFilter(label=u'Numer operacji', widget=forms.TextInput(attrs={'size': '16px'}))
status = django_filters.MultipleChoiceFilter(choices=Gate.GATE_STATUSES, label=u'Status')
rating = django_filters.MultipleChoiceFilter(choices=Gate.GATE_GRADES, label=u'Ocena')
class Meta:
pass
views.py
from .filters import GateFilter
class GateListView(generic.ListView):
queryset = None
gate_type = None
template_name = 'qapp/gate/list.html'
context_object_name = 'gate_list'
paginate_by = 20
def get_queryset(self):
# Type is stored in database as big-letter word, so 'bjc' != 'BJC'.
if self.gate_type.upper() == 'BJW':
ordering = ['bogie', 'bogie_type']
else:
ordering = ['tram', 'car']
queryset = Gate.objects.filter(type=self.gate_type.upper()).order_by(*ordering)
self.gate_list = GateFilter(self.request.GET, queryset=queryset)
return self.gate_list.qs.distinct()
def get_context_data(self, **kwargs):
context = super(GateListView, self).get_context_data(**kwargs)
# Return Gate.type to template.
context['gate_type'] = self.gate_type
# Return object (for generating form) to template.
context['gate_list_filter'] = self.gate_list
return context
正如你所看到的,在filters.py,變量tram_list,bogie_list和area_list的數據是動態的(從數據庫中提取)。
但是在將此類導入views.py期間,此數據將變為靜態。
我試圖覆蓋此值:
沒運氣。
由於導入類型( 來自.filters import GateFilter ),我無法使用reload()函數。
目前有關filters.py中的更新列表,我需要重新運行整個應用程序。 這對於我的應用程序的業務邏輯是無法接受的。
這是錯誤的方法。 相反,您應該使用知道查詢集並在需要時對其進行評估的篩選器:ModelChoiceFilter和ModelMultipleChoiceFilter。
class GateFilter(django_filters.FilterSet):
team = django_filters.ModelMultipleChoiceFilter(queryset=Tram.objects.all())
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