def _pb_from_query(query):
"""Convert a Query instance to the corresponding protobuf.
:type query: :class:`Query`
:param query: The source query.
:rtype: :class:`gcloud.datastore._generated.query_pb2.Query`
:returns: A protobuf that can be sent to the protobuf API. N.b. that
it does not contain "in-flight" fields for ongoing query
executions (cursors, offset, limit).
"""
pb = _query_pb2.Query()
for projection_name in query.projection:
pb.projection.add().property.name = projection_name
if query.kind:
pb.kind.add().name = query.kind
composite_filter = pb.filter.composite_filter
composite_filter.op = _query_pb2.CompositeFilter.AND
if query.ancestor:
ancestor_pb = query.ancestor.to_protobuf()
# Filter on __key__ HAS_ANCESTOR == ancestor.
ancestor_filter = composite_filter.filters.add().property_filter
ancestor_filter.property.name = '__key__'
ancestor_filter.op = _query_pb2.PropertyFilter.HAS_ANCESTOR
ancestor_filter.value.key_value.CopyFrom(ancestor_pb)
for property_name, operator, value in query.filters:
pb_op_enum = query.OPERATORS.get(operator)
# Add the specific filter
property_filter = composite_filter.filters.add().property_filter
property_filter.property.name = property_name
property_filter.op = pb_op_enum
# Set the value to filter on based on the type.
if property_name == '__key__':
key_pb = value.to_protobuf()
property_filter.value.key_value.CopyFrom(key_pb)
else:
helpers._set_protobuf_value(property_filter.value, value)
if not composite_filter.filters:
pb.ClearField('filter')
for prop in query.order:
property_order = pb.order.add()
if prop.startswith('-'):
property_order.property.name = prop[1:]
property_order.direction = property_order.DESCENDING
else:
property_order.property.name = prop
property_order.direction = property_order.ASCENDING
for distinct_on_name in query.distinct_on:
pb.distinct_on.add().name = distinct_on_name
return pb
def _make_query_pb(self, kind):
from gcloud.datastore._generated import query_pb2
pb = query_pb2.Query()
pb.kind.add().name = kind
return pb
