Question

Are the dates stored in the ‘created_at’ fields marshaled to Python datetime objects via PyMongo, or do I have to manually replace the text strings with Python Date objects? i.e.

How do I convert a property in MongoDB from text to date type?

It seems highly unnatural that I would have to replace the date strings with Python date objects, which is why I’m asking the question.

I would like to write queries that display the tweets from the past three days. Please let me know if there is a slick way of doing this. Thanks!

Answer 1

you can parse Twitter’s created_at timestamps to Python datetimes like so:

import datetime, pymongo
created_at = 'Mon Jun 8 10:51:32 +0000 2009' # Get this string from the Twitter API
dt = datetime.strptime(created_at, '%a %b %d %H:%M:%S +0000 %Y')

and insert them into your Mongo collection like this:

connection = pymongo.Connection('mymongohostname.com')
connection.my_database.my_collection.insert({
    'created_at': dt,
    # ... other info about the tweet ....
}, safe=True)

And finally, to get tweets within the last three days, newest first:

three_days_ago = datetime.datetime.utcnow() - datetime.timedelta(days=3)
tweets = list(connection.my_database.my_collection.find({
    'created_at': { '$gte': three_days_ago }
}).sort([('created_at', pymongo.DESCENDING)]))