In Django 1.7, die vorgeschlagenen Lösungen schien nicht für mich arbeiten, so schrieb ich meine FileField-Unterklassen zusammen mit einer Speicherunterklasse, die die alten Dateien entfernt.
Lagerung:
class OverwriteFileSystemStorage(FileSystemStorage):
def _save(self, name, content):
self.delete(name)
return super()._save(name, content)
def get_available_name(self, name):
return name
def delete(self, name):
super().delete(name)
last_dir = os.path.dirname(self.path(name))
while True:
try:
os.rmdir(last_dir)
except OSError as e:
if e.errno in {errno.ENOTEMPTY, errno.ENOENT}:
break
raise e
last_dir = os.path.dirname(last_dir)
Filefield:
def tweak_field_save(cls, field):
field_defined_in_this_class = field.name in cls.__dict__ and field.name not in cls.__bases__[0].__dict__
if field_defined_in_this_class:
orig_save = cls.save
if orig_save and callable(orig_save):
assert isinstance(field.storage, OverwriteFileSystemStorage), "Using other storage than '{0}' may cause unexpected behavior.".format(OverwriteFileSystemStorage.__name__)
def save(self, *args, **kwargs):
if self.pk is None:
orig_save(self, *args, **kwargs)
field_file = getattr(self, field.name)
if field_file:
old_path = field_file.path
new_filename = field.generate_filename(self, os.path.basename(old_path))
new_path = field.storage.path(new_filename)
os.makedirs(os.path.dirname(new_path), exist_ok=True)
os.rename(old_path, new_path)
setattr(self, field.name, new_filename)
# for next save
if len(args) > 0:
args = tuple(v if k >= 2 else False for k, v in enumerate(args))
kwargs['force_insert'] = False
kwargs['force_update'] = False
orig_save(self, *args, **kwargs)
cls.save = save
def tweak_field_class(orig_cls):
orig_init = orig_cls.__init__
def __init__(self, *args, **kwargs):
if 'storage' not in kwargs:
kwargs['storage'] = OverwriteFileSystemStorage()
if orig_init and callable(orig_init):
orig_init(self, *args, **kwargs)
orig_cls.__init__ = __init__
orig_contribute_to_class = orig_cls.contribute_to_class
def contribute_to_class(self, cls, name):
if orig_contribute_to_class and callable(orig_contribute_to_class):
orig_contribute_to_class(self, cls, name)
tweak_field_save(cls, self)
orig_cls.contribute_to_class = contribute_to_class
return orig_cls
def tweak_file_class(orig_cls):
"""
Overriding FieldFile.save method to remove the old associated file.
I'm doing the same thing in OverwriteFileSystemStorage, but it works just when the names match.
I probably want to preserve both methods if anyone calls Storage.save.
"""
orig_save = orig_cls.save
def new_save(self, name, content, save=True):
self.delete(save=False)
if orig_save and callable(orig_save):
orig_save(self, name, content, save=save)
new_save.__name__ = 'save'
orig_cls.save = new_save
return orig_cls
@tweak_file_class
class OverwriteFieldFile(models.FileField.attr_class):
pass
@tweak_file_class
class OverwriteImageFieldFile(models.ImageField.attr_class):
pass
@tweak_field_class
class RenamedFileField(models.FileField):
attr_class = OverwriteFieldFile
@tweak_field_class
class RenamedImageField(models.ImageField):
attr_class = OverwriteImageFieldFile
und meine upload_to Callables wie folgt aussehen:
def user_image_path(instance, filename):
name, ext = 'image', os.path.splitext(filename)[1]
if instance.pk is not None:
return os.path.join('users', os.path.join(str(instance.pk), name + ext))
return os.path.join('users', '{0}_{1}{2}'.format(uuid1(), name, ext))
Warum würde dies eine downvote verdienen? Es ist sicherlich eine Frage der besseren Qualität als einige. – hop
Es gibt keine zuverlässige Möglichkeit, die ID des nächsten Datensatzes im Voraus zu kennen. Sie können die ID erhalten, nachdem der Datensatz erstellt wurde, aber auch dies unterliegt den Rennbedingungen. Mein Tipp: Wählen Sie etwas anderes als die ID, um Ihre Dateien zu benennen. – Brandon
Zum Beispiel, aktuelle Zeitstempel + Mikrosekunden – ilvar