how do I write a function for connecting to mongodb using pymongo

Question

I'm trying to write a function to connect to mongodb and return a collection object. I have the following:

def getCollection(dbname,collection): client = MongoClient() data_base = client.dbname collObject = data_base.collection return collObject

When I run:

collection = getCollection(client, "hkpr_restore", "agents") print collection

I get:

Collection(Database(MongoClient('localhost', 27017), u'dbname'), u'collection')

What am I doing wrong?

Hint: count the number of arguments you are passing to your function. You might want to read How do I ask a good question, which enhances the probability for getting a useful answer drastically. You might find ESR's excellent essay How To Ask Questions The Smart Way helpful, too. — Markus W Mahlberg
– Markus W Mahlberg, Commented Apr 28, 2015 at 9:44

Yannick Clybouw · Accepted Answer · 2015-04-28 09:49:09Z

When using client.dbname, the attribute dbname is called, meaning you are retrieving the database named dbname.

Same applies for data_base.collection.

Solution:

def getCollection(dbname, collection): client = MongoClient() data_base = getattr(client, dbname) collObject = getattr(data_base, collection) return collObject

Alternative: you can use dictionary style access:

def getCollection(dbname, collection): client = MongoClient() data_base = client[dbname] collObject = data_base[collection] return collObject

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