MongoDB hearts Django? (Django NYC)
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The document discusses the integration of MongoDB, a document-oriented and schema-free database, with Django, a web framework. It highlights the advantages of using non-relational databases and provides code examples for handling data with MongoDB in Django applications. Additionally, it addresses the current limitations and potential future improvements for admin support in Django when using MongoDB.
![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](https://image.slidesharecdn.com/django-nyc-100121171117-phpapp01/85/MongoDB-hearts-Django-Django-NYC-10-320.jpg)
![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...'}]}](https://image.slidesharecdn.com/django-nyc-100121171117-phpapp01/85/MongoDB-hearts-Django-Django-NYC-15-320.jpg)
![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](https://image.slidesharecdn.com/django-nyc-100121171117-phpapp01/85/MongoDB-hearts-Django-Django-NYC-17-320.jpg)
![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/](https://image.slidesharecdn.com/django-nyc-100121171117-phpapp01/85/MongoDB-hearts-Django-Django-NYC-18-320.jpg)
MongoDB hearts Django? (Django NYC)
- 1. open-source, high-performance, schema-free, document-oriented database http://www.mongodb.org/
- 2. The Web framework for perfectionists with deadlines http://www.djangoproject.com/
- 4. “One size fits all” no longer RDBMS (Oracle, MySQL) Non-relational New gen. OLAP (vertica, aster, greenplum) operational stores (“NoSQL”)
- 5. NoSQL really means: non-relational next generation operational datastores and databases
- 6. Scaling out no joins + light transactional semantics = horizontally scalable architectures
- 7. Data models no joins + light transactional semantics = horizontally scalable architectures important side effect : new data models = improved ways to develop applications
- 8. Data models Key/value memcached, dynamo, voldemort Tabular bigtable, cassandra, hbase, hypertable Document-oriented couchdb,
- 10. 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
- 11. ?
- 12. Yes... ...but also sometimes no
- 13. 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
- 14. 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', )
- 15. 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...'}]}
- 16. 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
- 17. 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
- 18. 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/
- 19. mango - sessions and auth • Full sessions support • mango provided User class • supports is_authenticated(), set_password(), etc. http://github.com/vpulim/mango
- 20. 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
- 21. What about admin? • No great solution... yet. • Could replace admin app like mango does for sessions / auth • Or...
- 22. 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
- 23. 1. Download MongoDB http://www.mongodb.org 2. Try it out! 3. (And help us make things work better with Django!)
- 24. • http://www.mongodb.org • irc.freenode.net#mongodb • mongodb-user on google groups • @mongodb, @mdirolf • [email protected] • http://www.slideshare.net/mdirolf • http://github.com/mdirolf/djanMon/
Editor's Notes
- #24: blog post twitter