我刚刚将我的应用升级到 1.7(实际上仍在尝试)。
这就是我在 models.py 中的内容:
def path_and_rename(path):
def wrapper(instance, filename):
ext = filename.split('.')[-1]
# set filename as random string
filename = '{}.{}'.format(uuid4().hex, ext)
# return the whole path to the file
return os.path.join(path, filename)
return wrapper
class UserProfile(AbstractUser):
#...
avatar = models.ImageField(upload_to=path_and_rename("avatars/"),
null=True, blank=True,
default="avatars/none/default.png",
height_field="image_height",
width_field="image_width")
当我尝试 makemigrations
时,它会抛出:
ValueError: Could not find function wrapper in webapp.models.
Please note that due to Python 2 limitations, you cannot serialize unbound method functions (e.g. a method declared
and used in the same class body). Please move the function into the main module body to use migrations.
最佳答案
我不确定是否可以回答我自己的问题,但我只是想通了(我认为)。
根据this bug report ,我编辑了我的代码:
from django.utils.deconstruct import deconstructible
@deconstructible
class PathAndRename(object):
def __init__(self, sub_path):
self.path = sub_path
def __call__(self, instance, filename):
ext = filename.split('.')[-1]
# set filename as random string
filename = '{}.{}'.format(uuid4().hex, ext)
# return the whole path to the file
return os.path.join(self.path, filename)
path_and_rename = PathAndRename("/avatars")
然后,在字段定义中:
avatar = models.ImageField(upload_to=path_and_rename,
null=True, blank=True,
default="avatars/none/default.png",
height_field="image_height",
width_field="image_width")
这对我有用。
关于python - Django - 无法为具有动态 upload_to 值的 ImageField 创建迁移,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/25767787/