Django - 获取上传的文件类型/mimetype

Question

覆盖模型保存方法时，有没有办法获取上传文件的内容类型？我试过这个:

def save(self):
    print(self.file.content_type)
    super(Media, self).save()

但它没有用。在这个例子中，self.file 是一个 model.FileField:

file = models.FileField(upload_to='uploads/%m-%Y/')

编辑:我希望能够将内容类型保存到数据库中，所以在保存实际完成之前我需要它:)

Answer 1

class MyForm(forms.ModelForm):

    def clean_file(self):
        file = self.cleaned_data['file']
        try:
            if file:
                file_type = file.content_type.split('/')[0]
                print file_type

                if len(file.name.split('.')) == 1:
                    raise forms.ValidationError(_('File type is not supported'))

                if file_type in settings.TASK_UPLOAD_FILE_TYPES:
                    if file._size > settings.TASK_UPLOAD_FILE_MAX_SIZE:
                        raise forms.ValidationError(_('Please keep filesize under %s. Current filesize %s') % (filesizeformat(settings.TASK_UPLOAD_FILE_MAX_SIZE), filesizeformat(file._size)))
                else:
                    raise forms.ValidationError(_('File type is not supported'))
        except:
            pass

        return file

设置.py

TASK_UPLOAD_FILE_TYPES = ['pdf', 'vnd.oasis.opendocument.text','vnd.ms-excel','msword','application',]
TASK_UPLOAD_FILE_MAX_SIZE = "5242880"