Django Mongodb Engine

So you want to use

DJANGO AND
MONGODB
@ﬂaper87

DJANGO AND
MONGODB
THAT’S COOL, but you need
to know A COUPLE OF THINGS

( http://mongoengine.org )

An object-document mapper
to connect Python and MongoDB

Mongokit
( http://namlook.github.com/mongokit/ )

Another ODM
that takes mongodb into the web

DJANGO
MONGODB
ENGINE
(A MongoDB backend for Django)

DJANGO-NONREL
A good and up to date Django fork
that brings non-rel support

Sadly, some of your

django.contrib.*
may be broken, but not the admin

erm... OKAY
WHAT’S SO COOL
ABOUT THIS THEN?

WHAT’S SO COOL
ABOUT THIS THEN?
No changes needed.

ABOUT THIS THEN?
No changes needed.

NOBODY’S GONNA TOUCH
YOUR PRECIOUS BUILTINS.

NOBODY’S GONNA TOUCH
YOUR PRECIOUS BUILTINS.

REDUCED IMPEDANCE MISSMATCH

MAP / REDUCE
>>> for pair in Article.objects.map_reduce(_map, _reduce, 'wordcount'):
... print pair.key, pair.value

NEW INDEXES
class Club(models.Model):
location = ListField()
rating = models.FloatField()
...
class MongoMeta:
indexes = [
[('rating', -1)],
{'fields': [('location', '2d')], 'min': -42, 'max': 42},
]

Plus:

TONS OF DOCS
(which never hurts)

RAW QUERIES
MyModel.objects.raw_query(field=“value”)

EMBEDD IF
POSSIBLE
class Comment(models.Model):
created_on = models.DateTimeField()
author = EmbeddedModelField('Author')
text = models.TextField()

RE-THINK
YOUR MODELS
class Post(models.Model):
title = models.CharField()
text = models.TextField()
tags = ListField()

# Note: Use defer
comments = ListField(EmbeddedModelField('Comment'))

DO NOT USE IT
EVERYWHERE
MONGODB_MANAGED_APPS = ['myapp']

MONGODB_MANAGED_MODELS = ['myapp.MongoDBModel']

SERVE STATIC
FILES
GridFSStorage + nginx-GridFS

AGGREGATIONS?
MAP/REDUCE
class Min(MongoAggregate):
    initial_value = float('inf')
    reduce_template = '{alias} = ({lookup}<{alias})?{lookup}:{alias}'

class Max(MongoAggregate):
    initial_value = float('-inf')
    reduce_template = '{alias} = ({lookup}>{alias})?{lookup}:{alias}'

DATES WORK
But, MongoDB
does not support month/day queries

DO NOT TRY
TO MIGRATE
It Wont Work!

CONTRIBUTE
The Compiler’s a mess

Ask away
http://groups.google.com
/group/django-non-relational

Contribute:
http://django-mongodb.org
/meta/contributing.html

Django Mongodb Engine

More Related Content

What's hot

Similar to Django Mongodb Engine

More from Flavio Percoco Premoli

Recently uploaded

Django Mongodb Engine