MongoDB hearts Django? (Django NYC)

open-source, high-performance,
schema-free, document-oriented
database

http://www.mongodb.org/

The Web framework for perfectionists
with deadlines

http://www.djangoproject.com/

“One size ﬁts all”
no longer
RDBMS
(Oracle, MySQL)

Non-relational
New gen. OLAP
(vertica, aster, greenplum) operational stores
(“NoSQL”)

NoSQL really means:

non-relational next generation
operational datastores and databases

Scaling out
no joins +
light transactional semantics =
horizontally scalable architectures

Data models
no joins +
light transactional semantics =
horizontally scalable architectures

important side effect :
new data models =
improved ways to develop
applications

Data models
Key/value
memcached, dynamo, voldemort

Tabular
bigtable, cassandra, hbase, hypertable

Document-oriented
couchdb,

MongoDB in two minutes
• Documents (think rows) are dicts:
{“hello”: “world”}
{“hello”: “world”, “foo”: [{“bar”: 1}]}
• Collections (think tables) are schema-free
• Queries are dynamic
• Great single node performance
• Built in replication and auto-sharding
• No complex transactions

Yes...
...but also sometimes no

Similar to +
• A lot of Django doesn’t depend on django.db:
• URL dispatch, templates, I18N, caching, etc.
• Some things do:
• Models
• Auth
• Sessions
• Admin

settings.py
DATABASE_ENGINE = ''
DATABASE_NAME = ''
DATABASE_USER = ''
DATABASE_PASSWORD = ''
DATABASE_HOST = ''
DATABASE_PORT = ''

MIDDLEWARE_CLASSES = (
'django.middleware.common.CommonMiddleware',
# 'django.contrib.sessions.middleware.SessionMiddleware',
# 'django.contrib.auth.middleware.AuthenticationMiddleware',
)

INSTALLED_APPS = (
# 'django.contrib.auth',
'django.contrib.contenttypes',
# 'django.contrib.sessions',
'django.contrib.sites',
)

Representing a Poll

{'question': 'Do MongoDB + Django <3 each other?',
'pub_date': datetime.datetime(2010, 1, 21),
'choices': [{'votes': 35, 'choice': 'Yes!'},
{'votes': 2, 'choice': 'No...'}]}

models.py (PyMongo)
def save_poll(question):
return db.polls.insert({"question": question,
"pub_date": datetime.utcnow()})

def all_polls():
return db.polls.ﬁnd()

def add_choice(poll_id, choice):
db.polls.update({"_id": poll_id},
{"$push": {"choices": {"choice": choice,
"votes": 0}}})

def add_vote(poll_id, choice):
db.polls.update({"_id": poll_id},
{"$inc": {"choices.%d.votes" % choice: 1}})
http://api.mongodb.org/python

models.py (MongoKit)

class Poll(mongokit.Document):
structure = {"question": str,
"pub_date": datetime,
"choices": [{"choice": str,
"votes": int}]}
required_ﬁelds = ["question"]
default_values = {"pub_date": datetime.utcnow()}

http://bytebucket.org/namlook/mongokit

models.py (Ming)
class Poll(ming.Document):

class __mongometa__:
session = session
name = "polls"

_id = ming.Field(ming.schema.ObjectId)
question = ming.Field(str, required=True)
pub_date = ming.Field(datetime.datetime,
if_missing=datetime.datetime.utcnow)
choices = ming.Field([{"choice": str,
"votes": int}])

http://merciless.sourceforge.net/

mango - sessions and auth

• Full sessions support
• mango provided User class
• supports is_authenticated(), set_password(), etc.

http://github.com/vpulim/mango

mango - sessions and auth

SESSION_ENGINE = 'mango.session'
AUTHENTICATION_BACKENDS = ('mango.auth.Backend',)
MONGODB_HOST = 'localhost'
MONGODB_PORT = None
MONGODB_NAME = 'mydb'

http://github.com/vpulim/mango

What about admin?

• No great solution... yet.
• Could replace admin app like mango does
for sessions / auth
• Or...

Supporting MongoDB
in django.db
• Best solution (long term)

• http://bitbucket.org/kpot/django-mongodb/

• http://bitbucket.org/wkornewald/django-nonrel/

• http://code.djangoproject.com/wiki/NonSqlBackends

1. Download MongoDB
http://www.mongodb.org

2. Try it out!

3. (And help us make things work better with
Django!)

• http://www.mongodb.org
• irc.freenode.net#mongodb
• mongodb-user on google groups
• @mongodb, @mdirolf
• mike@10gen.com
• http://www.slideshare.net/mdirolf
• http://github.com/mdirolf/djanMon/

MongoDB hearts Django? (Django NYC)

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