TypeError：“MongoEngine”对象不可订阅
TypeError：“MongoEngine”对象不可订阅
提问于 2019-02-21 19:01:30
在一个flask应用程序中，我使用MongoEngine作为ORM。我在我的主要python文件中定义了db对象，并试图通过从那里导入它来从不同的类中重用它。
这是我在我的主要py文件中创建db的方式：
db = MongoEngine(app, config={
'db': "MY_DB",
'host': "myhost",
'port': 27017,
'username': 'user',
'password': 'password'
})这就是我在另一个类(它的实例正从rest入口点使用)中尝试做的事情：
from app.engine import db
class ReportService:
def __init__(self):
pass
@staticmethod
def download_raw_data(collection_name, _from, _to):
logger.info('Downloading raw_data from collection: ' + collection_name)
query = {
"date": {"$gte": _from, "$lte": _to}
}
result = db[collection_name].find(query)
return result然而，在调用该入口点时，我得到了这个错误：
[2019-02-21 10:52:22 +0000] [12] [ERROR] Error handling request module/download/rawdata
Traceback (most recent call last):
File "/app/env/lib/python3.6/site-packages/gunicorn/workers/base_async.py", line 56, in handle
self.handle_request(listener_name, req, client, addr)
File "/app/env/lib/python3.6/site-packages/gunicorn/workers/base_async.py", line 107, in handle_request
respiter = self.wsgi(environ, resp.start_response)
File "/app/env/lib/python3.6/site-packages/flask/app.py", line 2309, in __call__
return self.wsgi_app(environ, start_response)
File "/app/env/lib/python3.6/site-packages/flask_socketio/__init__.py", line 43, in __call__
start_response)
File "/app/env/lib/python3.6/site-packages/engineio/middleware.py", line 67, in __call__
return self.wsgi_app(environ, start_response)
File "/app/env/lib/python3.6/site-packages/flask/app.py", line 2295, in wsgi_app
response = self.handle_exception(e)
File "/app/env/lib/python3.6/site-packages/flask_cors/extension.py", line 161, in wrapped_function
return cors_after_request(app.make_response(f(*args, **kwargs)))
File "/app/env/lib/python3.6/site-packages/flask/app.py", line 1741, in handle_exception
reraise(exc_type, exc_value, tb)
File "/app/env/lib/python3.6/site-packages/flask/_compat.py", line 35, in reraise
raise value
File "/app/env/lib/python3.6/site-packages/flask/app.py", line 2292, in wsgi_app
response = self.full_dispatch_request()
File "/app/env/lib/python3.6/site-packages/flask/app.py", line 1815, in full_dispatch_request
rv = self.handle_user_exception(e)
File "/app/env/lib/python3.6/site-packages/flask_cors/extension.py", line 161, in wrapped_function
return cors_after_request(app.make_response(f(*args, **kwargs)))
File "/app/env/lib/python3.6/site-packages/flask/app.py", line 1718, in handle_user_exception
reraise(exc_type, exc_value, tb)
File "/app/env/lib/python3.6/site-packages/flask/_compat.py", line 35, in reraise
raise value
File "/app/env/lib/python3.6/site-packages/flask/app.py", line 1813, in full_dispatch_request
rv = self.dispatch_request()
File "/app/env/lib/python3.6/site-packages/flask/app.py", line 1799, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "/app/controllers/modules.py", line 51, in download_raw_data
result = reports.download_raw_data(collection_name, start_time, end_time)
File "/app/service/services.py", line 114, in download_raw_data
result = db[collection_name].find(query)
TypeError: 'MongoEngine' object is not subscriptable我做错了什么？我也想知道为什么会发生这个错误。
提前感谢
回答 1
Stack Overflow用户
发布于 2019-06-05 03:22:41
Mongoengine(...)返回的不是一个pymongo数据库实例，如果你想要它，你必须使用get_db()：
me = MongoEngine(app, config={...})
...
db = me.get_db()
db[collection_name].find(query)我同意docs是令人困惑的，因为它叫db，这是误导……
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/54805511
复制相关文章
相似问题
腾讯云开发者
