How to use the neomodel.relationship_manager.RelationshipManager function in neomodel

def __properties__(self):
        node_props = {}
        for key, value in items(super(PropertyManager, self).__dict__):
            if not (key.startswith('_') or value is None
                    or isinstance(value,
                        (types.MethodType, RelationshipManager, AliasProperty,))):
                node_props[key] = value
        return node_props

filter(lambda prop:
                   any([getattr(self, prop) is None,
                        isinstance(getattr(self, prop),
                                   relationship_manager.RelationshipManager),
                        prop in blocked_properties]), properties))

from neomodel.exceptions import (
    AttemptedCardinalityViolation, CardinalityViolation
)
from neomodel.relationship_manager import (
    RelationshipManager, ZeroOrMore
)  #noqa: F401


class ZeroOrOne(RelationshipManager):
    """ A relationship to zero or one node. """
    description = "zero or one relationship"

    def single(self):
        """
        Return the associated node.

        :return: node
        """
        nodes = super(ZeroOrOne, self).all()
        if len(nodes) == 1:
            return nodes[0]
        if len(nodes) > 1:
            raise CardinalityViolation(self, len(nodes))

    def all(self):

def __init__(self, relation_type, cls_name, direction,
                 manager=RelationshipManager,
                 model=None):
        self._raw_class = cls_name
        self.manager = manager
        self.definition = {}
        self.definition['relation_type'] = relation_type
        self.definition['direction'] = direction
        self.definition['model'] = model

def __properties__(self):
        from .relationship_manager import RelationshipManager

        return dict((name, value) for name, value in vars(self).items()
                    if not name.startswith('_')
                    and not callable(value)
                    and not isinstance(value,
                                       (RelationshipManager, AliasProperty,))
                    )

batch.add_indexed_node(cls.index.__index__, key, value, node)
        return batch


class CategoryNode(CypherMixin):
    def __init__(self, name):
        self.name = name

    def traverse(self, rel):
        return TraversalSet(self).traverse(rel)

    def _pre_action_check(self, action):
        pass


class InstanceManager(RelationshipManager):
    """Manage 'instance' rel of category nodes"""
    def connect(self, node):
        raise Exception("connect not available from category node")

    def disconnect(self, node):
        raise Exception("disconnect not available from category node")


def category_factory(instance_cls):
    """ Retrieve category node by name """
    name = instance_cls.__name__
    category_index = connection().get_or_create_index(neo4j.Node, 'Category')
    category = CategoryNode(name)
    category.__node__ = category_index.get_or_create('category', name, {'category': name})
    rel_type = camel_to_upper(instance_cls.__name__)
    category.instance = InstanceManager({

if nodes:
            return nodes
        raise CardinalityViolation(self, 'none')

    def disconnect(self, node):
        """
        Disconnect node
        :param node:
        :return:
        """
        if super(OneOrMore, self).__len__() < 2:
            raise AttemptedCardinalityViolation("One or more expected")
        return super(OneOrMore, self).disconnect(node)


class One(RelationshipManager):
    """
    A relationship to a single node
    """
    description = "one relationship"

    def single(self):
        """
        Return the associated node.

        :return: node
        """
        nodes = super(One, self).all()
        if nodes:
            if len(nodes) == 1:
                return nodes[0]
            else:

self.definition['direction'] = direction
        self.definition['model'] = model

    def _lookup_node_class(self):
        if not isinstance(self._raw_class, str):
            self.definition['node_class'] = self._raw_class
        else:
            name = self._raw_class
            self.definition['node_class'] = registry.get_type(name)

    def build_manager(self, source, name):
        self._lookup_node_class()
        return self.manager(source, name, self.definition)


class ZeroOrMore(RelationshipManager):
    description = "zero or more relationships"


def _relate(cls_name, direction, rel_type, cardinality=None, model=None):

    if model and not issubclass(model, (StructuredRel,)):
        raise ValueError('model must be a StructuredRel')
    return RelationshipDefinition(rel_type,
                                  cls_name,
                                  direction,
                                  cardinality,
                                  model)


def RelationshipTo(cls_name, rel_type, cardinality=ZeroOrMore, model=None):
    return _relate(cls_name, OUTGOING, rel_type, cardinality, model)

Connect to a node.

        :param node:
        :type: StructuredNode
        :param properties: relationship properties
        :type: dict
        :return: True / rel instance
        """
        if len(self):
            raise AttemptedCardinalityViolation(
                    "Node already has {0} can't connect more".format(self))
        else:
            return super(ZeroOrOne, self).connect(node, properties)


class OneOrMore(RelationshipManager):
    """ A relationship to zero or more nodes. """
    description = "one or more relationships"

    def single(self):
        """
        Fetch one of the related nodes

        :return: Node
        """
        nodes = super(OneOrMore, self).all()
        if nodes:
            return nodes[0]
        raise CardinalityViolation(self, 'none')

    def all(self):
        """