def _ensure_positive_int(string, field, cutoff=None):
msg = f'{field} must be a positive integer'
try:
value = int(string)
except ValueError:
raise exceptions.ValidationError(detail=msg)
if value < 0:
raise exceptions.ValidationError(detail=msg)
if cutoff is not None:
return min(value, cutoff)
return value
def _get_namespace(self, data):
"""Get collecton namespace from filename."""
ns_name = data['filename'].namespace
try:
return models.Namespace.objects.get(name=ns_name)
except models.Namespace.DoesNotExist:
raise exceptions.ValidationError(
f'Namespace "{ns_name}" does not exist.')
def get_format_type(self, request):
format = request.query_params.get('type')
if format is None:
return None
format = format.lower()
if format not in ALLOWED_FORMAT_TYPES:
raise exceptions.ValidationError(
f'{repr(format)} is not a valid format type.')
return format
def get_order_by(self, request):
param = request.query_params.get(self.ordering_param,
self.default_ordering)
order = 'asc'
if param.startswith('-'):
order = 'desc'
param = param[1:]
if param not in self.allowed_ordering:
raise exceptions.ValidationError(
f'{repr(param)} is not a valid ordering parameter value.')
return param, order