Question

我的烧瓶应用程序中有一个奇怪的错误。问题是下面的代码在Flask开发服务器中工作正常，但在生产服务器（Uwsgi + Nginx）中失败。代码的目的是从mongoDb中检索整个集合，并将其内容作为JSON提供。

我没有使用virtualenv，因为我在虚拟机下工作，而且，我没有在该机器上运行任何其他项目。堆栈就像这样：

的Python 烧瓶 MongoDb-＆GT; MongoEngine Uwsgi NGINX

我有两种模式：

一个公司：

class Company(Document):
    name = StringField(max_length=50)
    ....

一个适用于广告系列：

class Campaign(Document):
    name = StringField(min_length=8)
    company = ReferenceField(Company)
    ....

路由完成如下：

@app.route('/getjson', methods=['GET', 'POST'])
    def getJson():
        if request.method == 'GET':
        collection = request.args.get('collection')
        if collection == 'Campaign':
            return jsonify (getCampaign())

getCampaign（）函数如下所示：

def getCampaign():
    theCollection = Campaign.objects.all()
    theDict = {}
    for obj in x:
        dict_model = {
            obj.name:
            {
            'company': obj.company.name,
            ...
            }
    theDict.update(dict_model)
return theDict

这导致一个结合良好的Json，其中“application / json”为Content-Type。问题是，当在生产服务器上尝试相同的代码时，它会失败，惨遭抛出以下错误！

    Traceback (most recent call last):
  File "/usr/local/lib/python2.6/dist-packages/flask/app.py", line 1518, in __call__
    return self.wsgi_app(environ, start_response)
  File "/usr/local/lib/python2.6/dist-packages/flask/app.py", line 1506, in wsgi_app
    response = self.make_response(self.handle_exception(e))
  File "/usr/local/lib/python2.6/dist-packages/flask/app.py", line 1504, in wsgi_app
    response = self.full_dispatch_request()
  File "/usr/local/lib/python2.6/dist-packages/flask/app.py", line 1264, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/usr/local/lib/python2.6/dist-packages/flask/app.py", line 1262, in full_dispatch_request
    rv = self.dispatch_request()
  File "/usr/local/lib/python2.6/dist-packages/flask/app.py", line 1248, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "./mobuy.py", line 58, in getJson
    return jsonify (getCampaign())
  File "./jsonOut.py", line 36, in getCampaign
    'company': obj.company.name,
  File "/usr/local/lib/python2.6/dist-packages/bson/dbref.py", line 88, in __getattr__
     raise AttributeError(key)
  AttributeError: name

正在运行“'公司'：”％s“％obj。 dict ”会抛出此结果：

"company":"{'_created': False, '_data': {'status': 3, 'startDate':
datetime.datetime(2012, 5, 23, 20, 22, 28, 42000), None: ObjectId('4fbd4704f65b813c5900000d'), 
'EndDate': datetime.datetime(2012, 5, 23, 20, 22, 28, 42000), 
'name': u'Campaign13', 'max_claimed': 39, 'text': u'a discount', 
'company': DBRef(u'company', ObjectId('4fbd36f2f65b813869000008')),
'image': u'http://www.Company8.com/image.jpg', 'Shops': [],
 'category': 5, 'id': None, 'coupons': []},
 '_id': ObjectId('4fbd4704f65b813c5900000d'), '_changed_fields': [],
 '_initialised': True}",

HELP！为什么这在dev服务器上工作而不在Uwsgi中工作？

Answer 1

添加--lazy到您的uWSGI选项。也许你的mongodb驱动程序不是fork（）友好的。

Answer 2

你在开发中的mongoengine和uwsgi / nginx上有相同的版本吗？

你可以试试这个：

Campaign.objects.all().select_related()

Answer 3

我找到的解决方案是，我解决了问题并直接用pymongo查询了数据库

#init pymongo dor dbfer quering as uwsgi fails miserably
connection = Connection()
db = connection.mobuy_test
company_collection = db.company
campaign_collection = db.campaign
for obj in Campaign.objects.all(): #the mongoengine queryset loop
    theId = campaign_collection.find_one({'_id':obj.id})['company'].id
    companyName = company_collection.find_one({'_id':theId})['name']
    dict_model = {
                  'campaign_name': obj.name,
                  'campaign_company':companyName
                   ...
                  }

不确定我是否正确使用了pymongo查询但现在只能使用，唯一的问题是，它很脏。

Mongoengine Uwsgi Dbref属性错误

3 个答案: