django-import-export覆蓋不起作用

Question

我正在重寫django-import-export資源的方法。 但只執行父方法。

models.py

class Model(models.Model):
     modelField1  = models.CharField(
     modelField2...
     modelField3...

admin.py

class ModelResource(resources.ModelResource):

    def before_import(self, dataset, using_transactions, dry_run, **kwargs):
        print("INside BEfore IMport")
        dataset.headers = ('modelField1', 'modelField2', ...)
        del dataset[0]

    def get_instance(self, instance_loader, row):
        print("Inside get instance")
        return False

    def get_or_init_instance(self, instance_loader, row):
        print("INside Get or init")
        instance = self.get_instance(instance_loader, row)
        if instance:
            return (instance, False)
        else:
            return (self.init_instance(row), True)

@admin.register(Model)
class ModelAdmin(ImportExportModelAdmin):
    class Meta:
        model = MOdel
        resource_class = ModelResource
        list_display = ('modelField1', 'modelField2', ...)
        search_fields = ('modelField1', 'modelField2', ...)

我根本沒有在控制台中獲取打印語句。 直接從父方法拋出錯誤。 它們根本不應該被執行。 我對嗎 ？

 Line number: 1 - u"Column 'id' not found in dataset. Available columns are: [u'Col1', u'Col2', u'Col2', ...]"
Traceback (most recent call last):
File "/home/aswin/projects/mastercityenv/local/lib/python2.7/site-packages/import_export/resources.py", line 434, in import_row
instance, new = self.get_or_init_instance(instance_loader, row)
File "/home/aswin/projects/mastercityenv/local/lib/python2.7/site-packages/import_export/resources.py", line 258, in get_or_init_instance
instance = self.get_instance(instance_loader, row)
File "/home/aswin/projects/mastercityenv/local/lib/python2.7/site-packages/import_export/resources.py", line 252, in get_instance
return instance_loader.get_instance(row)
File "/home/aswin/projects/mastercityenv/local/lib/python2.7/site-packages/import_export/instance_loaders.py", line 32, in get_instance
params[field.attribute] = field.clean(row)
File "/home/aswin/projects/mastercityenv/local/lib/python2.7/site-packages/import_export/fields.py", line 63, in clean
list(data.keys())))
KeyError: u"Column 'id' not found in dataset. Available columns are: [u'Col1', u'Col2', u'Col2', ...]"

Excel文檔中的列名稱為“Col1”，“Col2”，...

問：所以如果你注意到上面代碼中的錯誤，那么它們來自我重載的父方法。 他們為什么被執行？ 是不是應該執行代碼在控制台中打印打印行？

Answer 1

根據文檔 ，不需要嵌套Meta類。 所以Admin類應該是這樣的：

@admin.register(Model)
class ModelAdmin(ImportExportModelAdmin):
    resource_class = ModelResource
    list_display = ('modelField1', 'modelField2', ...)
    search_fields = ('modelField1', 'modelField2', ...)