def render(self, context):
try:
source = self.src.resolve(context)
except VariableDoesNotExist:
return None
if self.version_prefix:
version_prefix = self.version_prefix
else:
try:
version_prefix = self.version_prefix_var.resolve(context)
except VariableDoesNotExist:
return None
try:
version_path = get_version_path(url_to_path(str(source)), version_prefix)
if not os.path.isfile(os.path.join(MEDIA_ROOT, version_path)):
# create version
version_path = version_generator(url_to_path(str(source)), version_prefix)
elif os.path.getmtime(os.path.join(MEDIA_ROOT, url_to_path(str(source)))) > os.path.getmtime(os.path.join(MEDIA_ROOT, version_path)):
# recreate version if original image was updated
version_path = version_generator(url_to_path(str(source)), version_prefix, force=True)
return path_to_url(version_path)
except:
return ""
def to_python(self, value):
if not value or isinstance(value, FileObject):
return value
return FileObject(url_to_path(value))
