def one(self, **properties):
from gremlin import select
from gremlin import get
query = self.query(select(**properties), get)
try:
element = query()[0]
except IndexError:
return None
else:
return element
def one(self, label, **properties):
import gremlin
query = gremlin.query(gremlin.vertices(label),
gremlin.where(**properties), gremlin.limit(1),
gremlin.get)
try:
element = query(self._graphdb)[0]
except IndexError:
return None
else:
return element
def query(self, *steps):
from gremlin import query
return lambda iterator=None: query(*steps)(self, iterator)