def change_name_of_file_on_change(sender, **kwargs):
"""
call to create a filename when saving the changes of a model with the pattern
ModelName_instance.pk_FieldName_YYYY-MM-DD_HH.MM.SS.ext
this is done before saving the model
"""
# Disable signal handler when loading fixtures
if kwargs.get('raw', False):
return
from .models import ProjectUpdate
if not kwargs.get('created', False):
instance = kwargs['instance']
opts = instance._meta
for f in opts.fields:
# extend this list of fields if needed to catch other uploads
if isinstance(f, ImageField):
img = getattr(instance, f.name)
# if a new image is uploaded it resides in a InMemoryUploadedFile
if img:
try:
if isinstance(img.file, InMemoryUploadedFile):
img.name = "%s_%s_%s_%s%s" % (
opts.object_name,
instance.pk or '',
f.name,
datetime.now().strftime("%Y-%m-%d_%H.%M.%S"),
os.path.splitext(img.name)[1],
)
# Create thumbnail for use in reports
if sender == ProjectUpdate:
get_report_thumbnail(img)
except Exception:
pass
def change_name_of_file_on_create(sender, **kwargs):
"""
call to create a filename when creating a new model instance with the pattern
ModelName_instance.pk_FieldName_YYYY-MM-DD_HH.MM.SS.ext
Since we cannot do this until the instance of the model has been saved
we do it as a post_save signal callback
"""
# Disable signal handler when loading fixtures
if kwargs.get('raw', False):
return
from .models import ProjectUpdate
# kwargs['raw'] is True when we're running manage.py loaddata
if kwargs.get('created', False) and not kwargs.get('raw', False):
instance = kwargs['instance']
opts = instance._meta
for f in opts.fields:
# extend this list of fields if needed to catch other uploads
if isinstance(f, ImageField):
# the actual image sits directly on the instance of the model
img = getattr(instance, f.name)
if img:
img_name = "%s_%s_%s_%s%s" % (
opts.object_name,
instance.pk or '',
f.name,
datetime.now().strftime("%Y-%m-%d_%H.%M.%S"),
os.path.splitext(img.name)[1],
)
save_image(img, img_name, f.name)
# Create thumbnail for use in reports
if sender == ProjectUpdate:
get_report_thumbnail(img)
def handle(self, *args, **options):
updates = ProjectUpdate.objects.all()
for update in updates:
rotate_spinner()
if update.photo:
get_report_thumbnail(update.photo)