在蓝图中获取 mongo 对象的正确方法是什么?
这是我的父 login.py
的方式:
app.config.from_object('config')
from flask.ext.pymongo import PyMongo
from child import child
from child2 import child2
app = Flask(__name__)
app.register_blueprint(child2.child2)
app.register_blueprint(child.child)
在我的 child.py
from app import app
from flask.ext.pymongo import PyMongo
mongo = PyMongo(app)
child = Blueprint('child', __name__)
child2.py
与child结构相同:
from app import app
from flask.ext.pymongo import PyMongo
mongo = PyMongo(app)
child2 = Blueprint('child2', __name__)
这是我收到的错误信息:
raise Exception('duplicate config_prefix "%s"' % config_prefix)
Exception: duplicate config_prefix "MONGO"
我已经在蓝图中尝试了以下内容
mongo = app.data.driver
但这会引发错误。这是完整的回溯:
Traceback (most recent call last):
File "login.py", line 12, in <module>
from child import child
File "/home/xxx/xxx/child/child.py", line 13, in <module>
mongo = PyMongo(app) #blueprint
File "/home/xxx/xxx/lib/python3.4/site-packages/flask_pymongo/__init__.py", line 97, in __init__
self.init_app(app, config_prefix)
File "/home/xxx/xxx/lib/python3.4/site-packages/flask_pymongo/__init__.py", line 121, in init_app
raise Exception('duplicate config_prefix "%s"' % config_prefix)
Exception: duplicate config_prefix "MONGO"
(xxx)xxx@linux:~/xxx$ python login.py
Traceback (most recent call last):
File "login.py", line 12, in <module>
from courses import courses
File "/home/xxx/xxx/child/child.py", line 13, in <module>
mongo = PyMongo(app) #blueprint
File "/home/xxx/xxx/lib/python3.4/site-packages/flask_pymongo/__init__.py", line 97, in __init__
self.init_app(app, config_prefix)
File "/home/xxx/xxx/lib/python3.4/site-packages/flask_pymongo/__init__.py", line 121, in init_app
raise Exception('duplicate config_prefix "%s"' % config_prefix)
Exception: duplicate config_prefix "MONGO"
一旦我的应用创建了连接,我应该如何在我的蓝图中选取它?
所以问题是如何在每个蓝图中构造连接字符串到数据库。这是文件结构:
login.py
config.py
/child/child.py
/child2/child2.py
这里是config.py
MONGO_DBNAME = 'xxx'
MONGO_URL = os.environ.get('MONGO_URL')
if not MONGO_URL:
MONGO_URL = "mongodb://xxx:xxxx@xxxx.mongolab.com:55822/heroku_xxx";
MONGO_URI = MONGO_URL
我已经在答案中尝试了下面的建议,但这没有用。请参阅我在该预期答案下方的评论。
最佳答案
按照 Emanuel Ey 的建议,在蓝图中执行导入的方法存在一个问题,结果证明它会导致循环导入。玩了很多之后,事实证明(我能找到的)唯一方法是创建一个名为 database.py
的单独文件连接到数据库,然后我可以通过蓝图导入此连接,如下所示:
child.py
from database import mongo
courses = Blueprint('courses', __name__)
和我的database.py
from flask.ext.pymongo import PyMongo
mongo = PyMongo()
和应用程序 login.py 但必须初始化数据库
from database import mongo
app = Flask(__name__)
app.config.from_object('config')
mongo.init_app(app) # initialize here!
from child import child
from child import2 child2
app.register_blueprint(child.child)
app.register_blueprint(child2.child2)
关于python - 如何将 PyMongo 与 Flask 蓝图一起使用?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/33166612/