如何在 django-import-export 上传过程中捕获字段实例

Question

我想将数据导入到我的资源中，但不包括学校字段，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，我该怎么办？？？

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, 'upload.html', 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','student_id','name','year','klass','stream')

Answer 1

从您的 'fields' 声明中删除 'school'，或者将其添加到 'exclude' 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

post()

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

如何在 django-import-export 上传过程中捕获字段实例

How to capture a field instance during django-import-export upload

django

django-views

python-3.x

django-import-export