图像文件将在Gallery实例之前保存。因此，您必须通过使用带有状态的Gallery实例本身的信号将保存分为两个阶段：
from django.db.models.signals import post_save, pre_save
from django.dispatch import receiver
_UNSAVED_FILEFIELD = 'unsaved_filefield'
@receiver(pre_save, sender=Image)
def skip_saving_file(sender, instance, **kwargs):
if not instance.pk and not hasattr(instance, _UNSAVED_FILEFIELD):
setattr(instance, _UNSAVED_FILEFIELD, instance.image)
instance.image = None
@receiver(post_save, sender=Image)
def save_file(sender, instance, created, **kwargs):
if created and hasattr(instance, _UNSAVED_FILEFIELD):
instance.image = getattr(instance, _UNSAVED_FILEFIELD)
instance.save()
# delete it if you feel uncomfortable...
# instance.__dict__.pop(_UNSAVED_FILEFIELD)
upload_path_handler看起来像
def upload_path_handler(instance, filename):
import os.path
fn, ext = os.path.splitext(filename)
return "site_media/images/gallery/{id}{ext}".format(id=instance.pk, ext=ext)
如果字段仅用于图像上传，我建议使用ImageField而不是FileField进行类型检查。另外，您可能希望规范化文件名扩展名（由于mimetype而不需要），例如
def normalize_ext(image_field):
try:
from PIL import Image
except ImportError:
import Image
ext = Image.open(image_field).format
if hasattr(image_field, 'seek') and callable(image_field.seek):
image_field.seek(0)
ext = ext.lower()
if ext == 'jpeg':
ext = 'jpg'
return '.' + ext
我遇到了同样的问题。Okm的答案使我走上了正确的道路，但在我看来，仅通过重写save()Model 的方法就可以实现相同的功能。
def save(self, *args, **kwargs):
if self.pk is None:
saved_image = self.image
self.image = None
super(Material, self).save(*args, **kwargs)
self.image = saved_image
super(Material, self).save(*args, **kwargs)
这肯定可以正确保存信息。
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