Instead of passing prefix as an argument, you could set it as an
attribute of your models. Something like this:
class User(AbstractUser):
prefix = "mugshot"
mugshot = models.ImageField('AB', upload_to= generate_attachment, ...)
then generate_attachment would be something like that:
def generate_mugshot(instance, filename):
filename, ext = os.path.splitext(filename)
return "%s/%s/%s%s" % (instance.prefix, instance.id, uuid4(), ext)
Should work
2017-01-11 11:49 GMT+01:00 Xx Johnsua <[email protected]>:
> I wrote 3 models:
>
> ...
> def generate_mugshot(instance, filename):
> filename, ext = os.path.splitext(filename)
> return "mugshot/%s/%s%s" % (instance.id, uuid4(), ext)
>
> def generate_team_photo(instance, filename):
> filename, ext = os.path.splitext(filename)
> return "team/%s/%s%s" % (instance.id, uuid4(), ext)
>
> def generate_gift_photo(instance, filename):
> filename, ext = os.path.splitext(filename)
> return "gift/%s/%s%s" % (instance.id, uuid4(), ext)
>
>
> class User(AbstractUser):
> ...
> mugshot = models.ImageField('头像', upload_to= generate_mugshot,
> validators=[check_image_extension], null=True, blank=True)
>
> class Team(models.Model):
> ...
> photo = models.ImageField('队标', upload_to= generate_team_photo,
> validators=[check_image_extension], blank=True, null=True)
>
> class Gift(models.Model):
> ...
> photo = models.ImageField('图片', upload_to= generate_gift_photo,
> validators=[check_image_extension], null=True, blank=True)
>
> If I want to add a new model, I have to write a new duplicate function
> "generate_something(instance, filename)", it is not pythonic. So I modify it
> to following code:
>
> def generate_attachment_by_id(prefix):
> def _return_function(instance, filename):
> filename, ext = os.path.splitext(filename)
> return "%s/%s/%s%s" % (prefix, instance.id, uuid4(), ext)
> return _return_function
>
> ...
>
> class User(AbstractUser):
> mugshot = models.ImageField('头像',
> upload_to=generate_attachment_by_id('mugshot'),
> validators=[check_image_extension], null=True, blank=True)
>
> class Team(models.Model):
> photo = models.ImageField('队标',
> upload_to=generate_attachment_by_id('team'),
> validators=[check_image_extension], blank=True, null=True)
>
> class Gift(models.Model):
> photo = models.ImageField('图片',
> upload_to=generate_attachment_by_id('gift'),
> validators=[check_image_extension], null=True, blank=True)
>
> Then I execute makemigrations, an error raised:
>
> ValueError: Could not find function _return_function in app.account.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.
> For more information, see
> https://docs.djangoproject.com/en/1.10/topics/migrations/#serializing-values
>
>
> So, how to solve the problem?
>
> Thank you for helping me...
>
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--
Cordialement, Coues Ludovic
+336 148 743 42
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