用py2neo neo4j更新屬性關系

Question

我正在嘗試檢查兩個節點之間是否存在關系，但出現此錯誤：

 raise TypeError("Nodes for relationship match end points must be bound") TypeError: Nodes for relationship match end points must be bound 

在我的代碼下面：

graph = Graph(user='neo4j')

src = Node(src_type, internal_id=int(src_id))
dst = Node(dst_type, internal_id=int(dst_id))

src_voted_dst = Relationship(src, "VOTED", dst)

for elem in graph.match(start_node=src, rel_type="VOTED", end_node=dst, bidirectional=True):
    elem.properties["vote"] = elem.properties["vote"] + 1
    elem.push()
    break
else:
    src_voted_dst.properties["vote"] = 1
    graph.merge(src_voted_dst)

Answer 1

在代碼中：

src = Node(src_type, internal_id=int(src_id))
dst = Node(dst_type, internal_id=int(dst_id))

src和dst在本地創建，但未綁定到數據庫中的這些節點。 通過合並將本地節點綁定到數據庫：

db_src = graph.merge(src)
db_dst = graph.merge(dst)

然后匹配應該起作用：

for elem in graph.match(db_src, "VOTED", db_dst)

（請注意elem.properties [“ vote”]不起作用，應該有一些鏈接elem.start_node（）[“ vote”]或elem.end_node（）[“ vote”]）