Django mongodb -djangoday_

So you want to useDJANGO ANDMONGODB @ﬂaper87

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

LIKE: WHAT ARETHE OPTIONS?

( http://mongoengine.org ) An object-document mapperto connect Python and MongoDB

Mongokit ( http://namlook.github.com/mongokit/ ) Another ODMthat takes mongodb into the web

OR, OF COURSE

DJANGOMONGODBENGINE(A MongoDB backend for Django)

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

Sadly, some of yourdjango.contrib.*may be broken, but not the admin

erm... OKAY WHAT’S SO COOLABOUT THIS THEN?

WHAT’S SO COOLABOUT 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

That’s coolWHAT ELSE?

NEW FIELDS

AGGREGATIONS

GRIDFS

CACHING

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

NEW INDEXESclass 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)

Suggeﬆions

RAW QUERIESMyModel.objects.raw_query(field=“value”)

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

RE-THINK YOUR MODELSclass Post(models.Model): title = models.CharField() text = models.TextField() tags = ListField() # Note: Use defer comments = ListField(EmbeddedModelField(Comment))

DO NOT USE IT EVERYWHEREMONGODB_MANAGED_APPS = [myapp]MONGODB_MANAGED_MODELS = [myapp.MongoDBModel]

SERVE STATIC FILESGridFSStorage + nginx-GridFS

AGGREGATIONS? MAP/REDUCEclass 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, MongoDBdoes not support month/day queries

DO NOT TRYTO MIGRATEIt Wont Work!

CONTRIBUTEThe Compiler’s a mess

Ask away http://groups.google.com/group/django-non-relational Contribute:http://django-mongodb.org /meta/contributing.html

Django mongodb -djangoday_

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