NeoModel在保存时出现属性错误

Question

我正在运行以下neo4j配置：

neo4j - 3.0.0
py2neo - 2.0.8
neomodel - 2.0.2

最后，我尝试运行的代码是：

class User(neomodel.StructuredNode):
    user_id = neomodel.IntegerProperty(unique_index=True, required=True)
    name = neomodel.StringProperty()
    phone_number = neomodel.StringProperty()

user = User(user_id=6, name='Sourabh Dev', phone_number='9711237840').save()

我不明白，为什么我一直收到这个奇怪的错误。我是做错了什么还是应该使用py2neo而不是neomodel？

我的回溯如下：

Traceback (most recent call last):
  File "<input>", line 1, in <module>
  File "/usr/local/lib/python3.4/site-packages/neomodel-2.0.2-py3.4.egg/neomodel/signals.py", line 25, in hooked
    val = fn(self, *args, **kwargs)
  File "/usr/local/lib/python3.4/site-packages/neomodel-2.0.2-py3.4.egg/neomodel/core.py", line 159, in save
    self._id = self.create(self.__properties__)[0]._id
  File "/usr/local/lib/python3.4/site-packages/neomodel-2.0.2-py3.4.egg/neomodel/core.py", line 289, in create
    results = db.cypher_query(query, params)
  File "/usr/local/lib/python3.4/site-packages/neomodel-2.0.2-py3.4.egg/neomodel/util.py", line 213, in cypher_query
    results = self._execute_query(query, params)
  File "/usr/local/lib/python3.4/site-packages/neomodel-2.0.2-py3.4.egg/neomodel/util.py", line 207, in _execute_query
    results = self.session.cypher.execute(query, create_params=params)
  File "/usr/local/lib/python3.4/site-packages/py2neo/cypher/core.py", line 136, in execute
    results = tx.commit()
  File "/usr/local/lib/python3.4/site-packages/py2neo/cypher/core.py", line 333, in commit
    return self.post(self.__commit or self.__begin_commit)
  File "/usr/local/lib/python3.4/site-packages/py2neo/cypher/core.py", line 288, in post
    raise self.error_class.hydrate(error)
  File "/usr/local/lib/python3.4/site-packages/py2neo/cypher/error/core.py", line 54, in hydrate
    error_cls = getattr(error_module, title)
AttributeError: 'module' object has no attribute 'TypeError'

- Sourabh Dev

---

有没有任何解决方法或者你使用的其他库？我正在使用几乎相同版本的neo4j、py2neo和neomodel。 - Swapnil Sawant

Answer 1

有两个要点：

1. 现有的Neomodel不支持Neo4j 3.0。

2. Cypher语法在3.0中发生了变化，因此会引发错误。

在2.x中，MATCH n RETURN n
在3.0中，MATCH (n) RETURN n

节点n用大括号括起来。

- Jack Daniel