无法设置 ImageField url 属性
我想更改 ImageField 的属性，但是我不断收到“无法设置属性”错误。
我的模型是
class Society(models.Model):
name = models.CharField(max_length=200)
slug = models.SlugField(unique=True)
summary = models.TextField(blank=True,null=True)
members = models.ManyToManyField(User,null=True,blank=True)
gallery = models.ForeignKey(Gallery,null=True,blank=True)
avatar = models.ImageField(upload_to=get_society_path)
def save(self,*args,**kwargs):
super(Society, self).save(*args,**kwargs)
fix_avatar_path(self)
def clean(self):
if self.id:
self.avatar.path = get_society_path(self,self.avatar.path)
save_thumb(self.avatar.path)
我的辅助函数是：
def get_society_path(instance,filename):
seperator_val = instance.id
if seperator_val is None:
seperator_val = get_time()
return '%s/society_%s/%s' % (settings.UPLOAD_ROOT,seperator_val,time_to_name(filename))
def fix_avatar_path(instance):
org_society_path = get_society_path(instance,instance.avatar.name)
make_upload_dir(org_society_path)
move(instance.avatar.path,org_society_path)
os.rmdir(os.path.dirname(instance.avatar.path))
instance.clean()
问题是：
我想将我的社会目录保存为 Society_society_id。但通常情况下，在保存模型之前我无法分配任何 id。所以我正在创建一个 tmp 文件，其名称是时间值。然后为了到达 Society 文件夹，我想重命名该文件。因此，我的 fix_avatar 只是在保存协会后将 tmp 文件的内容移动到 Society_(society_id) 文件夹。到目前为止一切都很好。但是，我的协会的 ImageField 仍然保存着之前创建的文件夹。为了改变它的值，我发现我可以使用干净的方法。（来自此 SO问题）但我仍然得到相同的结果，路径没有改变，并给出“无法设置属性”响应。
有什么想法吗？
I want to change my ImageField's attribute, however I'm constantly getting the Can't set attribute error.
My model is
class Society(models.Model):
name = models.CharField(max_length=200)
slug = models.SlugField(unique=True)
summary = models.TextField(blank=True,null=True)
members = models.ManyToManyField(User,null=True,blank=True)
gallery = models.ForeignKey(Gallery,null=True,blank=True)
avatar = models.ImageField(upload_to=get_society_path)
def save(self,*args,**kwargs):
super(Society, self).save(*args,**kwargs)
fix_avatar_path(self)
def clean(self):
if self.id:
self.avatar.path = get_society_path(self,self.avatar.path)
save_thumb(self.avatar.path)
And my helper functions are :
def get_society_path(instance,filename):
seperator_val = instance.id
if seperator_val is None:
seperator_val = get_time()
return '%s/society_%s/%s' % (settings.UPLOAD_ROOT,seperator_val,time_to_name(filename))
def fix_avatar_path(instance):
org_society_path = get_society_path(instance,instance.avatar.name)
make_upload_dir(org_society_path)
move(instance.avatar.path,org_society_path)
os.rmdir(os.path.dirname(instance.avatar.path))
instance.clean()
The problem is :
I want to save my society directories as society_society_id. But normally, I can't assign any id before the model is saved. So i'm creating a tmp file whose name is a time value.Then to reach societies folder, I want to rename this file. So, my fix_avatar simply moves the tmp file's content to society_(society_id) folder after the society is saved. So far so good everything works well. However, my society's ImageField still holds the previously created folder. In order to change it's value, I found that i can use clean method.(from this SO question) But still i'm getting the same result, the path doesn't change, and gives the "can't set attribute" response.
Any idea ??
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评论（2）
不确定自从提出这个问题以来 Django 中是否有过改变。关于此不可能的票证仍然存在： https://code.djangoproject.com/ticket/15590
然而，您实际上可以通过这样做来更改路径：
这项工作还有什么作用：
它在很多情况下都对我们有用。
Not sure, if this was ever changed in Django since this question was asked. A ticket about this not being possible still exists: https://code.djangoproject.com/ticket/15590
However, you actually can change the path by doing it like this:
What also does the job:
It has worked for us in several occasions.
问题在于：
您无法更改 FileField/ImageField 实例中路径属性的值，它是只读的。有一个 提案 在 Django 1.4 中更改此设置
The problem is here:
You cannot change the value of the path attribute in FileField/ImageField instances, it's readonly. There is a proposal to change this in Django 1.4