def _AddFilter(self, candidate_filter):
"""Checks a filter and sets it in the filter set.
Args:
candidate_filter: An NDB filter which may be added to the query info.
Raises:
AttributeError: if query on the object is already final.
TypeError: if the filter is not a simple filter (FilterNode).
ValueError: if the operator symbol in the filter is not equality.
"""
if self._query_final is not None:
raise AttributeError('Can\'t add more filters. Query info is final.')
if not isinstance(candidate_filter, ndb.FilterNode):
raise TypeError('Only simple filters can be used. Received: %s.' %
(candidate_filter,))
opsymbol = candidate_filter._FilterNode__opsymbol
if opsymbol != '=':
raise ValueError('Only equality filters allowed. Received: %s.' %
(opsymbol,))
self._filters.add(candidate_filter)
python类FilterNode()的实例源码
def make_query(self, ns):
"""Make a query of entities within this range.
Query options are not supported. They should be specified when the query
is run.
Args:
ns: namespace of this query.
Returns:
a db.Query or ndb.Query, depends on the model class's type.
"""
if issubclass(self.model_class, db.Model):
query = db.Query(self.model_class, namespace=ns)
for f in self.filters:
query.filter("%s %s" % (f[0], f[1]), f[2])
else:
query = self.model_class.query(namespace=ns)
for f in self.filters:
query = query.filter(ndb.FilterNode(*f))
return query
def filter_ndb_query(self, query, filters=None):
"""Add query filter to restrict to this key range.
Args:
query: An ndb.Query instance.
filters: optional list of filters to apply to the query. Each filter is
a tuple: (<property_name_as_str>, <query_operation_as_str>, <value>).
User filters are applied first.
Returns:
The input query restricted to this key range.
"""
assert _IsNdbQuery(query)
if filters:
for f in filters:
query = query.filter(ndb.FilterNode(*f))
if self.include_start:
start_comparator = ">="
else:
start_comparator = ">"
if self.include_end:
end_comparator = "<="
else:
end_comparator = "<"
if self.key_start:
query = query.filter(ndb.FilterNode("__key__",
start_comparator,
self.key_start))
if self.key_end:
query = query.filter(ndb.FilterNode("__key__",
end_comparator,
self.key_end))
return query
def filter_ndb_query(self, query, filters=None):
"""Add query filter to restrict to this key range.
Args:
query: An ndb.Query instance.
filters: optional list of filters to apply to the query. Each filter is
a tuple: (<property_name_as_str>, <query_operation_as_str>, <value>).
User filters are applied first.
Returns:
The input query restricted to this key range.
"""
assert _IsNdbQuery(query)
if filters:
for f in filters:
query = query.filter(ndb.FilterNode(*f))
if self.include_start:
start_comparator = ">="
else:
start_comparator = ">"
if self.include_end:
end_comparator = "<="
else:
end_comparator = "<"
if self.key_start:
query = query.filter(ndb.FilterNode("__key__",
start_comparator,
self.key_start))
if self.key_end:
query = query.filter(ndb.FilterNode("__key__",
end_comparator,
self.key_end))
return query
def filter_ndb_query(self, query, filters=None):
"""Add query filter to restrict to this key range.
Args:
query: An ndb.Query instance.
filters: optional list of filters to apply to the query. Each filter is
a tuple: (<property_name_as_str>, <query_operation_as_str>, <value>).
User filters are applied first.
Returns:
The input query restricted to this key range.
"""
assert _IsNdbQuery(query)
if filters:
for f in filters:
query = query.filter(ndb.FilterNode(*f))
if self.include_start:
start_comparator = ">="
else:
start_comparator = ">"
if self.include_end:
end_comparator = "<="
else:
end_comparator = "<"
if self.key_start:
query = query.filter(ndb.FilterNode("__key__",
start_comparator,
self.key_start))
if self.key_end:
query = query.filter(ndb.FilterNode("__key__",
end_comparator,
self.key_end))
return query
def filter_ndb_query(self, query, filters=None):
"""Add query filter to restrict to this key range.
Args:
query: An ndb.Query instance.
filters: optional list of filters to apply to the query. Each filter is
a tuple: (<property_name_as_str>, <query_operation_as_str>, <value>).
User filters are applied first.
Returns:
The input query restricted to this key range.
"""
assert _IsNdbQuery(query)
if filters:
for f in filters:
query = query.filter(ndb.FilterNode(*f))
if self.include_start:
start_comparator = ">="
else:
start_comparator = ">"
if self.include_end:
end_comparator = "<="
else:
end_comparator = "<"
if self.key_start:
query = query.filter(ndb.FilterNode("__key__",
start_comparator,
self.key_start))
if self.key_end:
query = query.filter(ndb.FilterNode("__key__",
end_comparator,
self.key_end))
return query
def filter_ndb_query(self, query, filters=None):
"""Add query filter to restrict to this key range.
Args:
query: An ndb.Query instance.
filters: optional list of filters to apply to the query. Each filter is
a tuple: (<property_name_as_str>, <query_operation_as_str>, <value>).
User filters are applied first.
Returns:
The input query restricted to this key range.
"""
assert _IsNdbQuery(query)
if filters:
for f in filters:
query = query.filter(ndb.FilterNode(*f))
if self.include_start:
start_comparator = ">="
else:
start_comparator = ">"
if self.include_end:
end_comparator = "<="
else:
end_comparator = "<"
if self.key_start:
query = query.filter(ndb.FilterNode("__key__",
start_comparator,
self.key_start))
if self.key_end:
query = query.filter(ndb.FilterNode("__key__",
end_comparator,
self.key_end))
return query
