通过neo4django连接到neo4j时出错

Question

我有一个使用neo4django映射器在neo4j（1.8.2版）上运行查询的Django（1.4.0版）web应用程序。

但是，只要我做一个查询像

OnlinePerson.objects.filter(name="Bijan") 

我得到一个运行时错误的

('The type node for class OnlinePerson could not be created in the database.', StatusException()) 

我尝试了很多不同的东西，但解决不了！

Traceback: 
File "/Library/Python/2.7/site-packages/django/core/handlers/base.py" in get_response 
    111.       response = callback(request, *callback_args, **callback_kwargs) 
File "/Users/Bijan/BHIC/mySVN/NeoD/src/NeoD/views.py" in home 
    22.  return render_to_response('index.html', {'Person' : entries, 'Person2': ["Bijan","Nastaran"]}) 
File "/Library/Python/2.7/site-packages/django/shortcuts/__init__.py" in render_to_response 
    20.  return HttpResponse(loader.render_to_string(*args, **kwargs), **httpresponse_kwargs) 
File "/Library/Python/2.7/site-packages/django/template/loader.py" in render_to_string 
    171.   return t.render(Context(dictionary)) 
File "/Library/Python/2.7/site-packages/django/template/base.py" in render 
    140.    return self._render(context) 
File "/Library/Python/2.7/site-packages/django/template/base.py" in _render 
    134.   return self.nodelist.render(context) 
File "/Library/Python/2.7/site-packages/django/template/base.py" in render 
    823.     bit = self.render_node(node, context) 
File "/Library/Python/2.7/site-packages/django/template/debug.py" in render_node 
    74.    return node.render(context) 
File "/Library/Python/2.7/site-packages/django/template/defaulttags.py" in render 
    145.   len_values = len(values) 
File "/Library/Python/2.7/site-packages/django/db/models/query.py" in __len__ 
    85.     self._result_cache = list(self.iterator()) 
File "/Library/Python/2.7/site-packages/neo4django/db/models/query.py" in iterator 
    733.   for model in self.query.execute(using): 
File "/Library/Python/2.7/site-packages/neo4django/db/models/query.py" in execute 
    610.    type_node = self.nodetype._type_node(using) 
File "/Library/Python/2.7/site-packages/neo4django/db/models/base.py" in _type_node 
    423.    return cls.__type_node_classmethod(using) 
File "/Library/Python/2.7/site-packages/neo4django/db/models/base.py" in __type_node 
    406.    raise RuntimeError(error_message, e) 

Exception Type: RuntimeError at/
Exception Value: ('The type node for class OnlinePerson could not be created in the database.', StatusException()) 

Answer 1

最后，在经历了很多困难并尝试了不同的解决方案之后，问题才得以解决。我认为主要问题是我的neo4j版本（1.8.2）。

切换回1.7.2后，一切正常。

Answer 2

您是否安装了Neo4j Gremlin插件？类型节点是使用Gremlin插件创建的，因为它们需要某些事务性承诺。它通常默认安装。不幸的是，一些环境（如Heroku）禁用了该插件。