def order(self, *args):
# q.order(Eployee.name, -Employee.age)
if not args:
return self
orders = []
o = self.__orders
if o:
orders.append(o)
for arg in args:
if isinstance(arg, model.Property):
orders.append(datastore_query.PropertyOrder(arg._name, ASC))
elif isinstance(arg, datastore_query.Order):
orders.append(arg)
else:
assert False, arg
if not orders:
orders = None
elif len(orders) == 1:
orders = orders[0]
else:
orders = datastore_query.CompositeOrder(orders)
return self.__class__(kind=self.kind,
ancestor=self.ancestor,
filters=self.filters,
orders=orders)
def orderings_to_orders(orderings):
orders = [ordering_to_order(o) for o in orderings]
if not orders:
return None
if len(orders) == 1:
return orders[0]
return datastore_query.CompositeOrder(orders)
def parse_gql(query_string):
"""Parse a GQL query string.
Args:
query_string: Full GQL query, e.g. 'SELECT * FROM Kind WHERE prop = 1'.
Returns:
A tuple (query, options, bindings) where query is a Query instance,
options a datastore_query.QueryOptions instance, and bindings a dict
mapping integers and strings to Binding instances.
"""
gql_qry = gql.GQL(query_string)
ancestor = None
flt = gql_qry.filters()
bindings = {}
filters = []
for ((name, op), values) in flt.iteritems():
op = op.lower()
if op == 'is' and name == gql.GQL._GQL__ANCESTOR:
assert len(values) == 1
[(func, args)] = values
ancestor = _args_to_val(func, args, bindings)
continue
assert op in _OPS.values()
for (func, args) in values:
val = _args_to_val(func, args, bindings)
filters.append(FilterNode(name, op, val))
if filters:
filters.sort() # For predictable tests.
filters = ConjunctionNode(filters)
else:
filters = None
orderings = gql_qry.orderings()
orders = []
for (name, direction) in orderings:
orders.append(datastore_query.PropertyOrder(name, direction))
if not orders:
orders = None
elif len(orders) == 1:
orders = orders[0]
else:
orders = datastore_query.CompositeOrder(orders)
qry = Query(kind=gql_qry._entity,
ancestor=ancestor,
filters=filters,
orders=orders)
offset = gql_qry.offset()
if offset < 0:
offset = None
limit = gql_qry.limit()
if limit < 0:
limit = None
options = QueryOptions(offset=offset, limit=limit)
return qry, options, bindings
