Flask -- Reloading database which was loaded before first request - mongodb

Question

I have an API run on flask which is connected to MongoDB and it uses this DB for reading only.
I connect to db before first request:
#app.before_first_request
def load_dicti():
c = MongoClient('mongodb://' + app.config['MONGO_DSN'], connect=False)
db = c.my_name
app.first, app.second = dictionary_compilation(db.my_base, another_dictionary)
However, this mongodb may be updated from time to time. My API doesn't know about it because this db was already loaded before first request.
What's the most efficient way to cope with it? I'd be grateful for explanations and code examples.

Answer 1

I don't quite figure out what you are going to do, but Application Context may be best practice. Just like demo in Flask docs, you could do:
def get_db():
"""Opens a new database connection if there is none yet for the
current application context.
"""
if not hasattr(g, 'db'):
c = MongoClient('mongodb://' + app.config['MONGO_DSN'], connect=False)
g.db = c.my_name
return g.db
Then, you could use get_db() directly in your view function, mongdb will be conntected once only when there is no db attr in g.
If your connection is not that stable that you need to change it everytime, you could connect every request or every session.