def __or__(self, other):
if hash(self.prop) != hash(other.prop):
raise excs.QueryError(
'{!r} cannot be combined with {!r}'.format(self.prop, other.prop))
elif self.operator != other.operator:
raise excs.QueryError(
'Operator mismatch with {!r} filter.'
' Use two separate filter calls.'.format(self.prop))
new_value = '|'.join((self.value, other.value))
return FilterNode(self.prop, self.operator, new_value)
def order(self, prop):
"""Order the query results by the given property.
Args:
prop: Property or OrderNode (i.e. a negated Property), The property to be
sorted on can be given as "Model.prop" to get an ascending sort or
"-Model.prop" to get a descending one.
Returns:
A reference to the query.
Raises:
ValueError: An improper argument was provided.
QueryError: The provided property is not associated with the Model being
queried.
"""
if isinstance(prop, query_nodes.OrderNode):
order = prop
prop = order.prop
else:
order = query_nodes.OrderNode(prop)
logging.info('Adding query sort: %s', order)
if not self._model_cls.is_valid_property(order.prop):
raise excs.QueryError(
'Invalid Property argument "{}" cannot be used with {}'.format(
order.prop, self._model_cls.__name__))
self._sort = order
return self
def expand(self, *props):
"""Expand foreign key(s) in the query results."""
logging.info(
'Adding query expands: %s',
', '.join('{} -> {}'.format(prop, prop.expands_to)
for prop in props))
for prop in props:
if not self._model_cls.is_valid_property(prop):
raise excs.QueryError('{}.{} cannot be used with {}'.format(
prop.model_cls_name, prop.name, self._model_cls.__name__))
elif not prop.expandable:
raise excs.QueryError(
'Property {} not marked as expandable'.format(prop))
self._expands |= set(props)
return self
def limit(self, limit):
"""Add a result limit to the query."""
logging.info('Adding query limit: %s', limit)
if limit < 0:
raise excs.QueryError('Limit must be non-negative')
self._limit = limit
return self
def filter(self, *filters):
"""Add property filter(s) to the query."""
logging.info('Adding query filter(s): %s',
', '.join('"{}"'.format(filter_) for filter_ in filters))
for filter_ in filters:
prop = filter_.prop
if not self._model_cls.is_valid_property(prop):
raise excs.QueryError('{!r} cannot be used to query {}'.format(
prop, self._model_cls.__name__))
self._filters.extend(filters)
return self
def __lt__(self, unused_other):
raise excs.QueryError('Unsupported operation for boolean properties')
