如何将过滤器从下拉列表传递到django-import-export视图 [英] How to pass a filter from a dropdown into django-import-export view
问题描述
我了解如何通过具有 return render(request,'htmlname.html,{})
的视图传递过滤器.对于这种通过django-import-export导出选项导出数据的情况,我不知道该怎么做.我想从下拉选择中通过一个过滤器,以下载要下载的数据.我的看法
I understand on how to pass a filter through views that have the return render(request, 'htmlname.html, {})
.
I don't know how to do it for this case of exporting data through django-import-export export option. I'd like to pass a filter from a dropdown selection for the data to be downloaded.
My view
def ExportStudentsView(request):
dataset = ExportStudentsResource().export(school = request.user.school,klass = ?????????)
response = HttpResponse(dataset.xls, content_type='application/vnd.ms-excel')
response['Content-Disposition'] = 'attachment; filename="All students.xls"'
return response
我的资源
class ExportStudentsResource(resources.ModelResource):
def export(self, queryset = None, *args, **kwargs):#this method helps capture the current user school
queryset = Students.objects.filter(school = kwargs['school'],klass = kwargs['klass'])
return super(ExportStudentsResource, self).export(queryset, *args, **kwargs)
klass__name = fields.Field(attribute = 'klass__name',column_name='class')#Changes column name from school__name to school
stream__name = fields.Field(attribute = 'stream__name',column_name='stream')
gender__name = fields.Field(attribute = 'gender__name',column_name='gender')
class Meta:
model = Students
fields = ('adm','name','kcpe','klass__name','stream__name','gender__name','notes')
export_id_fields = ('adm',)
export_order = ('adm','name','kcpe','klass__name','stream__name','gender__name','notes')
推荐答案
您可以采取几种方法.您选择的方法可能取决于这是否是一次性"解决方案.或者您需要可重用的课程.我可能会喜欢方法2".
There are a couple of approaches you could take. The approach you choose might depend on whether this is a "one-off" or if you need a reusable class. I would probably favour 'method 2'.
您可以在视图中过滤查询集,然后将其传递给导出:
You could filter the queryset in your view, and then pass this to export:
def export_students(request):
queryset = Students.objects.filter(school = kwargs['school'], klass = kwargs['klass'])
# notice that the first arg to the Resource is a Queryset
dataset = ExportStudentsResource().export(queryset)
方法2
覆盖资源上的 get_queryset()
方法.您可以在实例化时设置args并将其应用于查询:
Method 2
Override the get_queryset()
method on your resource. You can set args at instantiation and have them apply to the query:
class ExportStudentsResource(resources.ModelResource):
def __init__(self, **kwargs):
self.school = kwargs['school']
self.klass = kwargs['klass']
def get_queryset(self):
return Students.objects.filter(school=self.school, klass=self.klass)
If you look at the source for export()
it should make it clearer what is going on, and how this fits together.
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