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"""
Storing files according to a custom storage system
``FileField`` and its variations can take a ``storage`` argument to specify how
and where files should be stored.
"""
import random
import tempfile
from pathlib import Path
from django.core.files.storage import FileSystemStorage, default_storage
from django.db import models
class CustomValidNameStorage(FileSystemStorage):
def get_valid_name(self, name):
# mark the name to show that this was called
return name + "_valid"
temp_storage_location = tempfile.mkdtemp()
temp_storage = FileSystemStorage(location=temp_storage_location)
def callable_storage():
return temp_storage
def callable_default_storage():
return default_storage
class CallableStorage(FileSystemStorage):
def __call__(self):
# no-op implementation.
return self
class Storage(models.Model):
def custom_upload_to(self, filename):
return "foo"
def random_upload_to(self, filename):
# This returns a different result each time,
# to make sure it only gets called once.
return "%s/%s" % (random.randint(100, 999), filename)
def pathlib_upload_to(self, filename):
return Path("bar") / filename
normal = models.FileField(storage=temp_storage, upload_to="tests")
custom = models.FileField(storage=temp_storage, upload_to=custom_upload_to)
pathlib_callable = models.FileField(
storage=temp_storage, upload_to=pathlib_upload_to
)
pathlib_direct = models.FileField(storage=temp_storage, upload_to=Path("bar"))
random = models.FileField(storage=temp_storage, upload_to=random_upload_to)
custom_valid_name = models.FileField(
storage=CustomValidNameStorage(location=temp_storage_location),
upload_to=random_upload_to,
)
storage_callable = models.FileField(
storage=callable_storage, upload_to="storage_callable"
)
storage_callable_class = models.FileField(
storage=CallableStorage, upload_to="storage_callable_class"
)
storage_callable_default = models.FileField(
storage=callable_default_storage, upload_to="storage_callable_default"
)
default = models.FileField(
storage=temp_storage, upload_to="tests", default="tests/default.txt"
)
db_default = models.FileField(
storage=temp_storage, upload_to="tests", db_default="tests/db_default.txt"
)
empty = models.FileField(storage=temp_storage)
limited_length = models.FileField(
storage=temp_storage, upload_to="tests", max_length=20
)
extended_length = models.FileField(
storage=temp_storage, upload_to="tests", max_length=1024
)
|
