Django Mongodb Engine
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This document discusses options for using Django with MongoDB, including object-document mappers like MongoEngine and Mongokit. It notes that some Django contrib apps may be broken, but the admin will work. Key advantages of using Django and MongoDB together include reduced impedance mismatch, support for new fields like aggregations and GridFS, and ability to continue using Django without changes. It provides suggestions like embedding documents where possible, using raw queries, considering models, and contributing to open source projects.
![NEW INDEXES
class Club(models.Model):
location = ListField()
rating = models.FloatField()
...
class MongoMeta:
indexes = [
[('rating', -1)],
{'fields': [('location', '2d')], 'min': -42, 'max': 42},
]](https://image.slidesharecdn.com/django-mongodb-111002110919-phpapp02/85/Django-Mongodb-Engine-21-320.jpg)
![DO NOT USE IT
EVERYWHERE
MONGODB_MANAGED_APPS = ['myapp']
MONGODB_MANAGED_MODELS = ['myapp.MongoDBModel']](https://image.slidesharecdn.com/django-mongodb-111002110919-phpapp02/85/Django-Mongodb-Engine-27-320.jpg)
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Django Mongodb Engine
- 1. So you want to use DJANGO AND MONGODB @flaper87
- 2. DJANGO AND MONGODB THAT’S COOL, but you need to know A COUPLE OF THINGS
- 3. LIKE: WHAT ARE THE OPTIONS?
- 4. ( http://mongoengine.org ) An object-document mapper to connect Python and MongoDB
- 5. Mongokit ( http://namlook.github.com/mongokit/ ) Another ODM that takes mongodb into the web
- 7. DJANGO MONGODB ENGINE (A MongoDB backend for Django)
- 8. DJANGO-NONREL A good and up to date Django fork that brings non-rel support
- 9. Sadly, some of your django.contrib.* may be broken, but not the admin
- 10. erm...
- 11. erm... OKAY WHAT’S SO COOL ABOUT THIS THEN?
- 12. WHAT’S SO COOL ABOUT THIS THEN? No changes needed.
- 13. ABOUT THIS THEN? No changes needed. NOBODY’S GONNA TOUCH YOUR PRECIOUS BUILTINS.
- 14. NOBODY’S GONNA TOUCH YOUR PRECIOUS BUILTINS. REDUCED IMPEDANCE MISSMATCH
- 16. NEW FIELDS
- 17. AGGREGATIONS
- 18. GRIDFS
- 19. CACHING
- 20. MAP / REDUCE >>> for pair in Article.objects.map_reduce(_map, _reduce, 'wordcount'): ... print pair.key, pair.value
- 21. NEW INDEXES class Club(models.Model): location = ListField() rating = models.FloatField() ... class MongoMeta: indexes = [ [('rating', -1)], {'fields': [('location', '2d')], 'min': -42, 'max': 42}, ]
- 22. Plus: TONS OF DOCS (which never hurts)
- 23. Suggestions
- 25. EMBEDD IF POSSIBLE class Comment(models.Model): created_on = models.DateTimeField() author = EmbeddedModelField('Author') text = models.TextField()
- 26. RE-THINK YOUR MODELS class Post(models.Model): title = models.CharField() text = models.TextField() tags = ListField() # Note: Use defer comments = ListField(EmbeddedModelField('Comment'))
- 27. DO NOT USE IT EVERYWHERE MONGODB_MANAGED_APPS = ['myapp'] MONGODB_MANAGED_MODELS = ['myapp.MongoDBModel']
- 28. SERVE STATIC FILES GridFSStorage + nginx-GridFS
- 29. 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}'
- 30. DATES WORK But, MongoDB does not support month/day queries
- 31. DO NOT TRY TO MIGRATE It Wont Work!
- 32. CONTRIBUTE The Compiler’s a mess
- 33. Ask away http://groups.google.com /group/django-non-relational Contribute: http://django-mongodb.org /meta/contributing.html