def get_all(self):
        # TODO: find a blueprints method that returns all edges for a given 
        # label because you many not want to index edges
        config = self.client.config
        label_var = config.label_var
        label = self.element_class.get_label(config)
        return self.index.lookup(label_var,label)
Returns all the relationships for the label.
dataset/ETHPy150Open espeed/bulbs/bulbs/model.py/RelationshipProxy.get_all