如何在 django-import-export 上传期间捕获字段实例

如何解决如何在 django-import-export 上传期间捕获字段实例

我想将数据导入我的资源中减去学校字段，因为登录用户已经属于特定学校。如果我的 excel 中没有 school 字段，我该怎么做？？？

class uploadStudents(LoginrequiredMixin,View):
    context = {}
    def get(self,request):
        form = UploadStudentsForm()
        self.context['form'] = form
        return render(request,'upload.html',self.context)

    def post(self,request):
        form = UploadStudentsForm(request.POST,request.FILES)
        data_set = Dataset()
        if form.is_valid():
            file = request.FILES['file']
            extension = file.name.split(".")[-1].lower()
            resource = ImportStudentsResource()
            if extension == 'csv':
                data = data_set.load(file.read().decode('utf-8'),format=extension)
            else:
                data = data_set.load(file.read(),format=extension)
            result = resource.import_data(data_set,dry_run=True,collect_Failed_rows=True,raise_errors=True)
            if result.has_validation_errors() or result.has_errors():
                messages.success(request,f'Errors experienced during import.')
                print("error",result.invalid_rows)
                self.context['result'] = result
                return redirect('import_students')                
            else:
                result = resource.import_data(data_set,dry_run=False,raise_errors=False)
                self.context['result'] = None
                messages.success(request,f'Students uploaded successfully.')                
        else:
            self.context['form'] = UploadStudentsForm()

        return render(request,self.context)

资源

class ImportStudentsResource(resources.ModelResource):
    school = fields.Field(attribute = 'school',column_name='school',widget=ForeignKeyWidget(School,'name'))
    klass = fields.Field(attribute = 'klass',column_name='class',widget=ForeignKeyWidget(Klass,'name'))
    stream = fields.Field(attribute = 'stream',column_name='stream',widget=ForeignKeyWidget(Stream,'name'))
    class Meta:
        model = Student
        fields = ('school','student_id','name','year','klass','stream')
        import_id_fields = ('student_id',)
        import_order = ('school','stream')

解决方法

从您的“字段”声明中删除“学校”，或将其添加到“排除”列表中。

docs

编辑

要包含与登录用户关联的 school_id，您需要使用此 school_id 创建资源：

资源

class ImportStudentsResource(resources.ModelResource):

    def __init__(self,school_id):
        super().__init__()
        self.school_id = school_id

    def before_save_instance(self,instance,using_transactions,dry_run):
        instance.school_id = self.school_id

邮政（）

def post(self,request):
    # skipped existing code
    school_id = get_school_id_from_logged_in_user(self.request)
    resource = ImportStudentsResource(school_id)