[英]py2neo merge is returning None
我有以下代碼:
for t in set(tags):
new_tag = Node('Tag', name=t)
tag = graph.merge(new_tag, 'Tag', 'name')
rel = Relationship(tag, 'TAGGED', post)
graph.create(rel)
問題是graph.merge()
返回None
,但文檔說如果找不到匹配項,它將創建一個新節點。
這是我在執行graph.create(rel)
時得到的錯誤:
File "/Users/hugovillalobos/Documents/Code/FlaskrGraphProject/FlaskrGraphVenv/lib/python3.7/site-packages/py2neo/internal/operations.py", line 134, in <genexpr>
for labels, nodes in _node_create_dict(n for n in subgraph.nodes if n.graph is None).items():
AttributeError: 'NoneType' object has no attribute 'graph'
合並后提交。 然后建立關系。
你應該簡單地使用:
tag = graph.merge(new_tag)
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