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from ...cachefiles import ImageCacheFile
class ImageSpecFileDescriptor:
def __init__(self, field, attname, source_field_name):
self.attname = attname
self.field = field
self.source_field_name = source_field_name
def __get__(self, instance, owner):
if instance is None:
return self.field
else:
source = getattr(instance, self.source_field_name)
spec = self.field.get_spec(source=source)
file = ImageCacheFile(spec)
instance.__dict__[self.attname] = file
return file
def __set__(self, instance, value):
instance.__dict__[self.attname] = value
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